Airworthiness Directives; Boeing Model 747-400, 777-200, and 777-300 Series Airplanes, 299-303 [E5-8244]
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Federal Register / Vol. 71, No. 2 / Wednesday, January 4, 2006 / Proposed Rules
(Operations) Limited Inspection Service
Bulletin ISB.52–113, Revision 1, dated
February 11, 2005.
Unsafe Condition
(d) This AD results from in-service reports
of hinge bracket failures on the main landing
gear (MLG) doors. We are issuing this AD to
prevent failure of the hinge bracket on the
MLG door, which could result in separation
of the door, consequent structural damage to
the airplane, and possible injury to people on
the ground.
Compliance
(e) You are responsible for having the
actions required by this AD performed within
the compliance times specified, unless the
actions have already been done.
Inspection/Corrective Action
(f) At the applicable time specified in
paragraph (f)(1) or (f)(2) of this AD: Perform
a one-time detailed inspection for corrosion
of the hinge bracket assembly of the left and
right MLG doors by doing all the applicable
actions in accordance with the
Accomplishment Instructions of BAE
Systems (Operations) Limited Inspection
Service Bulletin ISB.52–113, Revision 1,
dated February 11, 2005. Perform any
applicable corrective action before further
flight in accordance with the service bulletin.
If no corrosion is found, before further flight,
apply protective treatment in accordance
with the service bulletin.
(1) For airplanes on which the date of
issuance of the original standard
airworthiness certificate or the date of
issuance of the original export certificate of
airworthiness is on or before February 28,
1991: Within 192 months since the date of
issuance of the original standard
airworthiness certificate or the date of
issuance of the original export certificate of
airworthiness, or within 12 months after the
effective date of this AD, whichever is later.
(2) For airplanes on which the date of
issuance of the original standard
airworthiness certificate or the date of
issuance of the original export certificate of
airworthiness is after February 28, 1991:
Within 24 months after the effective date of
this AD.
Note 1: For the purposes of this AD, a
detailed inspection is: ‘‘An intensive
examination of a specific item, installation,
or assembly to detect damage, failure, or
irregularity. Available lighting is normally
supplemented with a direct source of good
lighting at an intensity deemed appropriate.
Inspection aids such as mirror, magnifying
lenses, etc., may be necessary. Surface
cleaning and elaborate procedures may be
required.’’
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Inspections Accomplished According to
Previous Issue of Service Bulletin
(g) Inspections accomplished before the
effective date of this AD according to BAE
Systems (Operations) Limited Inspection
Service Bulletin ISB.52–113, dated February
2, 2001, are considered acceptable for
compliance with the corresponding action
specified in this AD.
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Parts Installation
(h) As of the effective date of this AD, no
person may install, on any airplane, a hinge
bracket assembly of the left and right MLG
doors, unless it has been inspected (and any
corrective actions done) according to BAE
Systems (Operations) Limited Inspection
Service Bulletin ISB.52–113, Revision 1,
dated February 11, 2005.
No Reporting Required
(i) Although BAE Systems (Operations)
Limited Inspection Service Bulletin ISB.52–
113, Revision 1, dated February 11, 2005,
referenced in this AD, specifies to submit
certain information to the manufacturer, this
AD does not include that requirement.
Alternative Methods of Compliance
(AMOCs)
(j)(1) The Manager, International Branch,
ANM–116, Transport Airplane Directorate,
FAA, has the authority to approve AMOCs
for this AD, if requested in accordance with
the procedures found in 14 CFR 39.19.
(2) Before using any AMOC approved in
accordance with § 39.19 on any airplane to
which the AMOC applies, notify the
appropriate principal inspector in the FAA
Flight Standards Certificate Holding District
Office.
Related Information
(k) British airworthiness directive G–2005–
0017, dated July 6, 2005, also addresses the
subject of this AD.
Issued in Renton, Washington, on
December 20, 2005.
Kalene C. Yanamura,
Acting Manager, Transport Airplane
Directorate, Aircraft Certification Service.
[FR Doc. E5–8243 Filed 1–3–06; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 2000–NM–360–AD]
RIN 2120–AA64
Airworthiness Directives; Boeing
Model 747–400, 777–200, and 777–300
Series Airplanes
Federal Aviation
Administration, DOT.
ACTION: Supplemental notice of
proposed rulemaking; reopening of
comment period.
AGENCY:
SUMMARY: This document revises an
earlier proposed airworthiness directive
(AD), applicable to Boeing Model 747–
400, 777–200, and 777–300 series
airplanes, that would have required an
inspection of the flight deck humidifier
to determine certain part numbers. That
proposed AD also would have required,
for certain airplanes, replacing the cell
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299
stack of the flight deck humidifier with
a supplier-tested cell stack, or replacing
the cell stack with a blanking plate and
subsequently deactivating the flight
deck humidifier, if necessary. For other
airplanes, that proposed AD would have
required replacing the cell stack with a
supplier-tested cell stack, or replacing
the cell stack with a blanking plate and
subsequently deactivating the
humidifier system, if necessary. The
proposed AD also would have allowed
blanking plates to be replaced with cell
stacks. This new action revises the
proposed rule by adding airplanes to the
applicability, requiring an inspection of
the flight deck humidifier to determine
certain part numbers on certain
airplanes, and requiring replacement of
the cell stack on certain other airplanes.
The actions specified by this new
proposed AD are intended to prevent an
increased pressure drop across the
humidifier and consequent reduced
airflow to the flight deck, which could
result in the inability to clear any smoke
that might appear in the flight deck.
This action is intended to address the
identified unsafe condition.
Comments must be received by
January 30, 2006.
DATES:
Submit comments in
triplicate to the Federal Aviation
Administration (FAA), Transport
Airplane Directorate, ANM–114,
Attention: Rules Docket No. 2000–NM–
360–AD, 1601 Lind Avenue, SW.,
Renton, Washington 98055–4056.
Comments may be inspected at this
location between 9 a.m. and 3 p.m.,
Monday through Friday, except Federal
holidays. Comments may be submitted
via fax to (425) 227–1232. Comments
may also be sent via the Internet using
the following address: 9-anmnprmcomment@faa.gov. Comments sent
via fax or the Internet must contain
‘‘Docket No. 2000–NM–360–AD’’ in the
subject line and need not be submitted
in triplicate. Comments sent via the
Internet as attached electronic files must
be formatted in Microsoft Word 97 or
2000 or ASCII text.
The service information referenced in
the proposed rule may be obtained from
Boeing Commercial Airplanes, P.O. Box
3707, Seattle, Washington 98124–2207.
This information may be examined at
the FAA, Transport Airplane
Directorate, 1601 Lind Avenue, SW.,
Renton, Washington.
ADDRESSES:
FOR FURTHER INFORMATION CONTACT:
Jeffrey S. Palmer, Aerospace Engineer,
Cabin Safety and Environmental
Systems Branch, ANM–150S, FAA,
Seattle Aircraft Certification Office,
1601 Lind Avenue, SW., Renton,
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Federal Register / Vol. 71, No. 2 / Wednesday, January 4, 2006 / Proposed Rules
Washington 98055–4056; telephone
(425) 917–6481; fax (425) 917–6590.
SUPPLEMENTARY INFORMATION:
Comments Invited
Interested persons are invited to
participate in the making of the
proposed rule by submitting such
written data, views, or arguments as
they may desire. Communications shall
identify the Rules Docket number and
be submitted in triplicate to the address
specified above. All communications
received on or before the closing date
for comments, specified above, will be
considered before taking action on the
proposed rule. The proposals contained
in this action may be changed in light
of the comments received.
Submit comments using the following
format:
• Organize comments issue-by-issue.
For example, discuss a request to
change the compliance time and a
request to change the service bulletin
reference as two separate issues.
• For each issue, state what specific
change to the proposed AD is being
requested.
• Include justification (e.g., reasons or
data) for each request.
Comments are specifically invited on
the overall regulatory, economic,
environmental, and energy aspects of
the proposed rule. All comments
submitted will be available, both before
and after the closing date for comments,
in the Rules Docket for examination by
interested persons. A report
summarizing each FAA-public contact
concerned with the substance of this
proposal will be filed in the Rules
Docket.
Commenters wishing the FAA to
acknowledge receipt of their comments
submitted in response to this action
must submit a self-addressed, stamped
postcard on which the following
statement is made: ‘‘Comments to
Docket Number 2000–NM–360–AD.’’
The postcard will be date stamped and
returned to the commenter.
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Availability of NPRMs
Any person may obtain a copy of this
NPRM by submitting a request to the
FAA, Transport Airplane Directorate,
ANM–114, Attention: Rules Docket No.
2000–NM–360–AD, 1601 Lind Avenue,
SW., Renton, Washington 98055–4056.
Discussion
A proposal to amend part 39 of the
Federal Aviation Regulations (14 CFR
part 39) to add an airworthiness
directive (AD), applicable to Boeing
Model 747–400, 777–200, and 777–300
series airplanes, equipped with a
Hamilton Sundstrand flight deck
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humidifier, was published as a
supplemental notice of proposed
rulemaking (referred to hereafter as the
first SNPRM) in the Federal Register on
January 6, 2005 (70 FR 1211).
The first SNPRM would have required
an inspection of the flight deck
humidifier to determine certain part
numbers. The first SNPRM also would
have required, for certain airplanes,
replacing the cell stack of the flight deck
humidifier with a supplier-tested cell
stack, or replacing the cell stack with an
end plate and subsequent deactivation
of the flight deck humidifier, if
necessary. For other airplanes, the first
SNPRM would have required replacing
the cell stack with a supplier-tested cell
stack, or replacing the cell stack with a
blanking plate and subsequent
deactivation of the humidifier system, if
necessary. The first SNPRM also would
have allowed end plates or blanking
plates to be replaced with cell stacks.
The first SNPRM was prompted by
reports of sagging cell stack membranes
of the flight deck humidifiers. That
condition, if not corrected, could result
in an increased pressure drop across the
humidifier and consequent reduced
airflow to the flight deck, which could
result in the inability to clear any smoke
that might appear in the flight deck.
Actions Since Issuance of First SNPRM
Since the issuance of the first SNPRM,
Boeing has issued Boeing Alert Service
Bulletin 747–21A2414, Revision 2,
dated July 7, 2005 (Revision 1, dated
October 26, 2000, was referenced as an
applicable source of service information
for doing the actions in that SNPRM);
and Boeing Alert Service Bulletin 777–
21A0048, Revision 2, dated July 14,
2005 (Revision 1, dated September 7,
2000, was referenced as an applicable
source of service information for doing
the actions in the first SNPRM).
Revision 2 of the alert service bulletins
contains essentially the same
procedures for the replacement of
certain cell stacks of the flight deck
humidifier. However, Revision 2 of the
alert service bulletins adds airplanes to
the effectivity. For those airplanes,
Revision 2 of the alert service bulletin
adds a procedure to inspect for a certain
flight deck humidifier and inspect for a
certain cell stack if necessary. Revision
2 of the alert service bulletins also
specifies on which airplanes the
replacement should be accomplished.
We have made the following changes
to the first SNPRM:
• We have revised the applicability of
this second SNPRM to reference
Revision 2 of the alert service bulletins.
• We have referenced Revision 2 of
the alert service bulletins as the
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appropriate source of service
information for accomplishing the cell
stack replacements.
• We have also revised the format of
this second SNPRM to clarify that a new
or supplier-tested cell stack may be
installed on flight deck humidifiers that
have a blanking plate; paragraphs (a)
and (d) of this second SNPRM (cited as
paragraphs (b) and (e) of the first
SNPRM) include the information on
blanking plate replacement that was
specified in paragraphs (b)(3) and (e)(3)
of the first SNPRM. In addition, for the
blanking plate replacement specified in
paragraph (a) of this second SNPRM, we
specify that the replacement be done in
accordance with Hamilton Sundstrand
Service Bulletin 821486–21–01, dated
March 15, 2000, and that if the flight
deck humidifier is activated after the
replacement, the humidifier must be
activated in accordance with Boeing
Service Bulletin 747–21–2405, Revision
4, dated July 29, 1999.
• We have revised the format of this
second SNPRM to require that certain
airplanes do the inspections for part
numbers and then replace the cell stack
if necessary and that certain other
airplanes replace the cell stack. Revision
2 of the alert service bulletins specifies
on which airplanes (identified
according to groups in the alert service
bulletins) to do the inspection and then
the replacement if necessary, and on
which airplanes to do the replacement.
• We have revised the cost estimate of
this second SNPRM.
Comments
We have also given due consideration
to the comments received in response to
the first SNPRM.
Request To Revise Number of Affected
Airplanes
One commenter, the manufacturer,
requests that the number of airplanes
that could be fitted with the potentially
defective cell stack be revised from 114
airplanes, as stated in the ‘‘Request to
Withdraw the Proposed AD’’ section of
the first SNPRM, to 176 airplanes. The
commenter states that 176 humidifiers
have been delivered that could have the
potentially defective cell stacks.
We agree with the commenter that the
total number of airplanes that could be
fitted with the potentially defective cell
stack is 176. We have revised the
number in the Cost Impact section of
this second SNPRM.
Request To Allow Additional Records
Review
The same commenter requests that we
add an additional records review to
allow operators to show compliance
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Federal Register / Vol. 71, No. 2 / Wednesday, January 4, 2006 / Proposed Rules
with the intent of the first SNPRM. The
commenter states that if an airplane or
retrofit kit was delivered after December
16, 1999, and the record review shows
that the humidifier or cell stack was not
replaced since, no inspection or
replacement of the humidifier is
needed. The commenter notes that
December 16, 1999 is the delivery date
of the first airplane that was delivered
with an acceptable cell stack that was
screened in production. The commenter
contends that all humidifier deliveries
would thereafter contain a cell stack
that is not susceptible to the unsafe
condition.
We partially agree with the
commenter. We acknowledge that
airplanes delivered after December 16,
1999, would not require that the
humidifier be inspected or replaced if
there has not been any maintenance on
the humidifier and the appropriate part
markings could be determined.
However, we have not revised the
requirements for the records review
specified in the first SNPRM since this
review would include airplanes
delivered with a known good cell stack.
As specified in paragraphs (c) and (f) of
this second SNPRM, a records review
would be allowed in lieu of the
inspection.
Request To Revise Nomenclature
The same commenter requests that the
term ‘‘end plate’’ in the first SNPRM be
revised to ‘‘blanking plate.’’ The
commenter states that an end plate is
actually a part that exists in the cell
stack assembly, while a blanking plate
is a part that can be installed in lieu of
the cell stack. The commenter
recommends that the first SNPRM
describe part number (P/N) 1001157–1
as a blanking plate.
We agree with the commenter. Where
the first SNPRM specifies an end plate,
we have revised this second SNPRM to
specify a blanking plate.
Clarification of P/Ns
Boeing Alert Service Bulletin 747–
21A2414, Revision 2, dated July 7, 2005,
specifies the cell stack P/N as 103111–
2 in paragraph 3. of ‘‘Group 2–3: Part
3—Cell Stack Part Number Inspection’’
of the Accomplishment Instructions of
the service bulletin. The correct P/N is
1003111–2.
Boeing Alert Service Bulletin 777–
21A0048, Revision 2, dated July 14,
2005, specifies the cell stack P/N as
10311–1 in paragraph 2.C. of ‘‘Parts
Necessary For Each Airplane’’ and 2.D.
of ‘‘Parts Necessary to Change Spares’’
of the service bulletin. The correct P/N
is 1003111–1.
Explanation of Change Made to This
AD
We have revised paragraph (d)(1) of
this second SNPRM to clarify the
delegation authority for Authorized
Representatives for the Boeing
Commercial Airplanes Delegation
Option Authorization.
Clarification of Alternative Method of
Compliance (AMOC) Paragraph
We have revised this second SNPRM
to clarify the appropriate procedure for
notifying the principal inspector before
using any approved AMOC on any
airplane to which the AMOC applies.
Conclusion
Since this change expands the scope
of this second SNPRM, the FAA has
determined that it is necessary to reopen
the comment period to provide
additional opportunity for public
comment.
Cost Impact
There are approximately 176
airplanes of the affected design in the
worldwide fleet. The FAA estimates that
29 airplanes of U.S. registry would be
affected by this second SNPRM. The
cost per airplane would range between
$390 and $6,248 per airplane,
depending on the actions chosen by the
operator. The fleet cost estimate would
not exceed $181,192.
ESTIMATED COSTS
Model/series
Action
747–400, 777–200, 777–
300.
747–400 ..............................
Inspect flight deck humidifier for part number and inspect flight deck humidifier cell stack for part number.
Replace cell stack with new or supplier-tested cell
stack.
Replace cell stack with blanking plate and deactivate
humidifier.
Replace cell stack with blanking plate ...........................
Replace cell stack with new or supplier-tested cell
stack.
Replace blanking plate with supplier-tested cell stack ...
747–400 ..............................
777–200, 777–300 .............
777–200, 777–300 .............
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777–200, 777–300 .............
The cost impact figures discussed
above are based on assumptions that no
operator has yet accomplished any of
the proposed requirements of this AD
action, and that no operator would
accomplish those actions in the future if
this AD were not adopted. The cost
impact figures discussed in AD
rulemaking actions represent only the
time necessary to perform the specific
actions actually required by the AD.
These figures typically do not include
incidental costs, such as the time
required to gain access and close up,
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Hourly rate
1
$65
$0
$65
3
65
5,100
5,295
5
65
0
325
3
3
65
65
0
6,053
195
6,248
1
65
6,053
6,118
planning time, or time necessitated by
other administrative actions.
Authority for This Rulemaking
Title 49 of the United States Code
specifies the FAA’s authority to issue
rules on aviation safety. Subtitle I,
section 106, describes the authority of
the FAA Administrator. Subtitle VII,
Aviation Programs, describes in more
detail the scope of the Agency’s
authority.
We are issuing this rulemaking under
the authority described in subtitle VII,
part A, subpart III, section 44701,
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Cost per
airplane
Work hours
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Parts cost
‘‘General requirements.’’ Under that
section, Congress charges the FAA with
promoting safe flight of civil aircraft in
air commerce by prescribing regulations
for practices, methods, and procedures
the Administrator finds necessary for
safety in air commerce. This regulation
is within the scope of that authority
because it addresses an unsafe condition
that is likely to exist or develop on
products identified in this rulemaking
action.
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Federal Register / Vol. 71, No. 2 / Wednesday, January 4, 2006 / Proposed Rules
Regulatory Impact
The regulations proposed herein
would not have a substantial direct
effect on the States, on the relationship
between the national Government and
the States, or on the distribution of
power and responsibilities among the
various levels of government. Therefore,
it is determined that this proposal
would not have federalism implications
under Executive Order 13132.
For the reasons discussed above, I
certify that this proposed regulation (1)
is not a ‘‘significant regulatory action’’
under Executive Order 12866; (2) is not
a ‘‘significant rule’’ under the DOT
Regulatory Policies and Procedures (44
FR 11034, February 26, 1979); and (3) if
promulgated, will not have a significant
economic impact, positive or negative,
on a substantial number of small entities
under the criteria of the Regulatory
Flexibility Act. A copy of the draft
regulatory evaluation prepared for this
action is contained in the Rules Docket.
A copy of it may be obtained by
contacting the Rules Docket at the
location provided under the caption
ADDRESSES.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation
safety, Safety.
The Proposed Amendment
Accordingly, pursuant to the
authority delegated to me by the
Administrator, the Federal Aviation
Administration proposes to amend part
39 of the Federal Aviation Regulations
(14 CFR part 39) as follows:
PART 39—AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
§ 39.13
[Amended]
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2. Section 39.13 is amended by
adding the following new airworthiness
directive:
Boeing: Docket 2000–NM–360–AD.
Applicability: Model 747–400, 777–200,
and 777–300 series airplanes, certificated in
any category; as identified in Boeing Alert
Service Bulletin 747–21A2414, Revision 2,
dated July 7, 2005; and Boeing Alert Service
Bulletin 777–21A0048, Revision 2, dated July
14, 2005.
Compliance: Required as indicated, unless
accomplished previously.
To prevent an increased pressure drop
across the humidifier and consequent
reduced airflow to the flight deck, which
could result in the inability to clear any
smoke that might appear in the flight deck,
accomplish the following:
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Cell Stack Replacement: Model 747–400
Series Airplanes
(a) For Model 747–400 series airplanes
identified as Group 1 in Boeing Alert Service
Bulletin 747–21A2414, Revision 2, dated July
7, 2005: Within 90 days after the effective
date of this AD, do the replacement specified
in paragraph (a)(1) or (a)(2) of this AD. For
flight deck humidifiers with a blanking plate:
If the blanking plate is removed and a new
or supplier-tested cell stack is installed, the
replacement must be done in accordance
with the Accomplishment Instructions of
Hamilton Sundstrand Service Bulletins
821486–21–01, dated March 15, 2000; and
after the replacement, the flight deck
humidifier may be activated in accordance
with the Accomplishment Instructions of
Boeing Service Bulletin 747–21–2405,
Revision 4, dated July 29, 1999.
(1) Replace the cell stack of the flight deck
humidifier with a supplier-tested cell stack,
in accordance with Part 1 of the
Accomplishment Instructions of Boeing Alert
Service Bulletin 747–21A2414, Revision 2,
dated July 7, 2005.
(2) Replace the cell stack of the flight deck
humidifier with a blanking plate and, before
further flight, deactivate the flight deck
humidifier, in accordance with Part 2 of the
Accomplishment Instructions of Boeing Alert
Service Bulletin 747–21A2414, Revision 2,
dated July 7, 2005.
Note 1: Boeing Alert Service Bulletin 747–
21A2414, Revision 2, dated July 7, 2005,
refers to Boeing Service Bulletin 747–21–
2405, Revision 4, dated July 29, 1999, as an
additional source of service information for
deactivating the humidifier.
Note 2: Boeing Alert Service Bulletin 747–
21A2414, Revision 2, dated July 7, 2005,
refers to Hamilton Sundstrand Service
Bulletins 821486–21–01, dated March 15,
2000, as an additional source of service
information for the cell stack replacements.
(b) Replacement of the cell stack before the
effective date of this AD in accordance with
Boeing Alert Service Bulletin 747–21A2414,
dated April 13, 2000; or Revision 1, dated
October 26, 2000; is acceptable for
compliance with the applicable requirements
of paragraphs (a)(1) and (a)(2) of this AD.
Inspections/Records Review: Model 747–400
Series Airplanes
(c) For Model 747–400 series airplanes
identified as Groups 2 and 3 in Boeing Alert
Service Bulletin 747–21A2414, Revision 2,
dated July 7, 2005: Within 90 days after the
effective date of this AD, inspect the flight
deck humidifier to determine whether part
number (P/N) 821486–1 is installed, in
accordance with Part 3 of the
Accomplishment Instructions of Boeing Alert
Service Bulletin 747–21A2414, Revision 2,
dated July 7, 2005. Instead of inspecting the
flight deck humidifier, a review of airplane
maintenance records is acceptable if the P/N
of the flight deck humidifier can be
positively determined from that review.
(1) If a P/N other than P/N 821486–1 is
installed, no further action is required by this
paragraph.
(2) If P/N 821486–1 is installed, inspect the
flight deck humidifier cell stack to determine
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whether P/N 821482–1 is installed and ‘‘DEV
13433’’ is not marked next to the cell stack
part number, in accordance with Part 3 of the
Accomplishment Instructions of the alert
service bulletin. Instead of inspecting the
flight deck humidifier cell stack, a review of
airplane maintenance records is acceptable if
the P/N, including whether ‘‘DEV 13433’’ is
marked next to the P/N, of the flight deck
humidifier cell stack can be positively
determined from that review.
(i) If the cell stack has P/N 821482–2 or
1003111–2, or if ‘‘DEV 13433’’ is marked next
to P/N 821482–1, no further action is
required by this paragraph.
(ii) If the cell stack has P/N 821482–1 and
does not have ‘‘DEV 13433’’ marked next to
the cell stack part number: Before further
flight, do the replacement specified in
paragraph (a) of this AD.
Cell Stack Replacement: Model 777–200 and
–300 Series Airplanes
(d) For Model 777–200 and 777–300 series
airplanes identified as Groups 1 through 5 in
Boeing Alert Service Bulletin 777–21A0048,
Revision 2, dated July 14, 2005: Within 90
days after the effective date of this AD, do the
replacement specified in paragraph (d)(1) or
(d)(2) of this AD. For flight deck humidifiers
with a blanking plate: If a blanking plate is
removed and a new or supplier-tested cell
stack installed, the cell stack installation
must be done in accordance with Part 3 of
the Accomplishment Instructions of Boeing
Alert Service Bulletin 777–21A0048,
Revision 2, dated July 14, 2005; and after the
installation, the humidifier system may be
activated in accordance with
Accomplishment Instructions of Boeing
Service Bulletin 777–21–0035, Revision 1,
dated October 19, 2000.
(1) Replace the cell stack with a blanking
plate, in accordance with Part 1 of the
Accomplishment Instructions of Boeing Alert
Service Bulletin 777–21A0048, Revision 2,
dated July 14, 2005; and, before further flight,
deactivate the humidifier system in
accordance with a method approved by the
Manager, Seattle Aircraft Certification Office
(ACO), FAA, or in accordance with data
meeting the certification basis of the airplane
approved by an Authorized Representative
for the Boeing Commercial Airplanes
Delegation Option Authorization who has
been authorized by the Manager, Seattle
ACO, to make those findings. For a
deactivation method to be approved, the
deactivation must meet the certification basis
of the airplane, and the approval must
specifically reference this AD.
(2) Replace the cell stack with a suppliertested cell stack, in accordance with Part 2
of the Accomplishment Instructions of
Boeing Alert Service Bulletin 777–21A0048,
Revision 2, dated July 14, 2005.
Note 3: Boeing Alert Service Bulletin 777–
21A0048, Revision 2, dated July 14, 2005,
refers to Hamilton Sundstrand Service
Bulletin 816086–21–01, dated March 15,
2000, as an additional source of service
information for the cell stack replacement.
(e) Replacement of the cell stack before the
effective date of this AD in accordance with
Boeing Service Bulletin 777–21A0048,
Revision 1, dated September 7, 2000, is
E:\FR\FM\04JAP1.SGM
04JAP1
Federal Register / Vol. 71, No. 2 / Wednesday, January 4, 2006 / Proposed Rules
acceptable for compliance with the
applicable requirements of paragraphs (d)(1)
and (d)(2) of this AD.
Inspections/Records Review: Model 777–200
and –300 Series Airplanes
(f) For Model 777–200 and 777–300 series
airplanes identified as Groups 6 and 7 in
Boeing Alert Service Bulletin 777–21A0048,
Revision 2, dated July 14, 2005: Within 90
days after the effective date of this AD,
inspect the flight deck humidifier to
determine if it is P/N 816086–1, in
accordance with Part 4 of the
Accomplishment Instructions of Boeing Alert
Service Bulletin 777–21A0048, Revision 2,
dated July 14, 2005. Instead of inspecting the
flight deck humidifier, a review of airplane
maintenance records is acceptable if the part
number (P/N) of the flight deck humidifier
can be positively determined from that
review.
(1) If a P/N other than P/N 816086–1 is
installed, no further action is required by this
paragraph.
(2) If P/N 816086–1 is installed, inspect the
flight deck humidifier cell stack to determine
whether P/N 822976–2 is installed and ‘‘DEV
13433’’ is not marked next to the cell stack
part number, in accordance with Part 4 of the
Accomplishment Instruction of the alert
service bulletin. Instead of inspecting the
flight deck humidifier cell stack, a review of
airplane maintenance records is acceptable if
the P/N, including whether ‘‘DEV 13433’’ is
marked next to the P/N, of the flight deck
humidifier cell stack can be positively
determined from that review.
(i) If the cell stack has P/N 822976–3 or
1003111–1, or if ‘‘DEV 13433’’ is marked next
to P/N 822976–2, no further action is
required by this paragraph.
(ii) If the cell stack has P/N 822976–2 and
does not have ‘‘DEV 13433’’ marked next to
the cell stack part number, before further
flight, do the replacement specified in
paragraph (d) of this AD.
Parts Installation
(g) On Model 747–400 series airplanes: As
of the effective date of this AD, no person
may install a flight deck humidifier cell stack
having P/N 821482–1, unless ‘‘DEV 13433’’ is
also marked next to the cell stack part
number.
(h) On Model 777–200 and 777–300 series
airplanes: As of the effective date of this AD,
no person may install a flight deck
humidifier cell stack having P/N 822976–2,
unless ‘‘DEV 13433’’ is also marked next to
the cell stack part number.
wwhite on PROD1PC65 with PROPOSAL
Alternative Methods of Compliance
(1) In accordance with 14 CFR 39.19, the
Manager, Seattle ACO, is authorized to
approve alternative methods of compliance
for this AD.
(2) Before using any AMOC approved in
accordance with 14 CFR 39.19 on any
airplane to which the AMOC applies, notify
the appropriate principal inspector in the
FAA Flight Standards Certificate Holding
District Office.
VerDate Aug<31>2005
16:23 Jan 03, 2006
Jkt 208001
Issued in Renton, Washington, on
December 27, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. E5–8244 Filed 1–3–06; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF ENERGY
Federal Energy Regulatory
Commission
18 CFR Parts 35 and 370
[Docket No. RM05–35–000]
Standard of Review for Modifications
to Jurisdictional Agreements
December 27, 2005.
Federal Energy Regulatory
Commission, DOE.
ACTION: Notice of proposed rulemaking.
AGENCY:
SUMMARY: The Federal Energy
Regulatory Commission (Commission) is
issuing a notice of proposed rulemaking
to propose a general rule regarding the
standard of review applicable to
proposed modifications to Commissionjurisdictional agreements under the
Federal Power Act and Natural Gas Act.
The intent of the proposed rulemaking
is to promote the sanctity of contracts,
recognize the importance of providing
certainty and stability in competitive
electric energy markets, and provide
adequate protection of energy
customers. The Commission is inviting
comments on the notice of proposed
rulemaking.
DATES: Comments are due February 3,
2006.
ADDRESSES: Comments may be filed
electronically via the eFiling link on the
Commission’s Web site at https://
www.ferc.gov. Commenters unable to
file comments electronically must send
an original and fourteen (14) copies of
their comments to: Federal Energy
Regulatory Commission, Secretary of the
Commission, 888 First Street, NE.,
Washington, DC 20426. Refer to the
Comment Procedures section of the
preamble for additional information on
how to file comments.
FOR FURTHER INFORMATION CONTACT:
Hadas Kozlowski, Office of the General
Counsel, Federal Energy Regulatory
Commission, 888 First Street, NE.,
Washington, DC 20426, (202) 502–8030.
Shaheda Sultan, Office of the General
Counsel, Federal Energy Regulatory
Commission, 888 First Street, NE.,
Washington, DC 20426, (202) 502–8845.
Richard Howe, Office of the General
Counsel, Federal Energy Regulatory
PO 00000
Frm 00029
Fmt 4702
Sfmt 4702
303
Commission, 888 First Street, NE.,
Washington, DC 20426, (202) 502–8289.
SUPPLEMENTARY INFORMATION:
I. Introduction
1. The Commission is proposing to
amend its regulations to provide a
general rule regarding the standard of
review that must be met to justify
proposed modifications to Commissionjurisdictional agreements under the
Federal Power Act (FPA) and the
Natural Gas Act (NGA) that are not
agreed to by the signatories (or their
successors). Specifically, the
Commission proposes to repeal its
regulation 1 at 18 CFR 35.1(d).
2. In its place, the Commission
proposes a regulation which provides
that, in the absence of prescribed
contractual language enabling the
Commission to review proposed
modification to agreements that are not
agreed to by the signatories (or their
successors) under a just and reasonable
standard, the Commission will review
such agreements under a public interest
standard, in accordance with the
Mobile-Sierra doctrine.2 However, this
regulation will not apply to
transmission service agreements
executed under an open access
transmission tariff as provided for under
Order No. 888 3 and agreements for the
transportation of natural gas (to the
extent that they are executed pursuant
to the standard form of service
agreements in pipeline tariffs), as these
forms of service agreement already
mandate the use of the just and
reasonable standard of review.
3. This regulation will be applied on
a prospective basis, i.e., it will become
effective for all Commissionjurisdictional contracts under the FPA
or the NGA executed 30 days or more
after the final rule is published in the
Federal Register.
II. Background
4. The FPA and the NGA require that
rates, terms, and conditions of service
1 We also terminate our proposed policy
statement in Docket No. PL02–7–000.
2 See United Gas Pipe Line Co. v. Mobile Gas
Serv. Corp., 350 U.S. 332 (1956); FPC v. Sierra
Pacific Power Co., 350 U.S. 348 (1956) (MobileSierra).
3 Promoting Wholesale Competition Through
Open Access Non-discriminatory Transmission
Services by Public Utilities and Recovery of
Stranded Costs by Public Utilities and Transmitting
Utilities, Order No. 888, FERC Stats. & Regs.
¶ 31,036 (1996), order on reh’g, Order No. 888–A,
FERC Stats. & Regs. ¶ 31,048 (1997), order on reh’g,
Order No. 888–B, 81 FERC ¶ 61,248 (1997), order
on reh’g, Order No. 888–C, 82 FERC ¶ 61,046
(1998), aff’d in relevant part sub nom. Transmission
Access Policy Study Group v. FERC, 225 F.3d 667
(D.C. Cir. 2000), aff’d sub nom. New York v. FERC,
535 U.S. 1 (2002).
E:\FR\FM\04JAP1.SGM
04JAP1
]]>Agencies
[Federal Register Volume 71, Number 2 (Wednesday, January 4, 2006)]
[Proposed Rules]
[Pages 299-303]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E5-8244]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 2000-NM-360-AD]
RIN 2120-AA64
Airworthiness Directives; Boeing Model 747-400, 777-200, and 777-
300 Series Airplanes
AGENCY: Federal Aviation Administration, DOT.
ACTION: Supplemental notice of proposed rulemaking; reopening of
comment period.
-----------------------------------------------------------------------
SUMMARY: This document revises an earlier proposed airworthiness
directive (AD), applicable to Boeing Model 747-400, 777-200, and 777-
300 series airplanes, that would have required an inspection of the
flight deck humidifier to determine certain part numbers. That proposed
AD also would have required, for certain airplanes, replacing the cell
stack of the flight deck humidifier with a supplier-tested cell stack,
or replacing the cell stack with a blanking plate and subsequently
deactivating the flight deck humidifier, if necessary. For other
airplanes, that proposed AD would have required replacing the cell
stack with a supplier-tested cell stack, or replacing the cell stack
with a blanking plate and subsequently deactivating the humidifier
system, if necessary. The proposed AD also would have allowed blanking
plates to be replaced with cell stacks. This new action revises the
proposed rule by adding airplanes to the applicability, requiring an
inspection of the flight deck humidifier to determine certain part
numbers on certain airplanes, and requiring replacement of the cell
stack on certain other airplanes. The actions specified by this new
proposed AD are intended to prevent an increased pressure drop across
the humidifier and consequent reduced airflow to the flight deck, which
could result in the inability to clear any smoke that might appear in
the flight deck. This action is intended to address the identified
unsafe condition.
DATES: Comments must be received by January 30, 2006.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Transport Airplane Directorate, ANM-114,
Attention: Rules Docket No. 2000-NM-360-AD, 1601 Lind Avenue, SW.,
Renton, Washington 98055-4056. Comments may be inspected at this
location between 9 a.m. and 3 p.m., Monday through Friday, except
Federal holidays. Comments may be submitted via fax to (425) 227-1232.
Comments may also be sent via the Internet using the following address:
9-anm-nprmcomment@faa.gov. Comments sent via fax or the Internet must
contain ``Docket No. 2000-NM-360-AD'' in the subject line and need not
be submitted in triplicate. Comments sent via the Internet as attached
electronic files must be formatted in Microsoft Word 97 or 2000 or
ASCII text.
The service information referenced in the proposed rule may be
obtained from Boeing Commercial Airplanes, P.O. Box 3707, Seattle,
Washington 98124-2207. This information may be examined at the FAA,
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton,
Washington.
FOR FURTHER INFORMATION CONTACT: Jeffrey S. Palmer, Aerospace Engineer,
Cabin Safety and Environmental Systems Branch, ANM-150S, FAA, Seattle
Aircraft Certification Office, 1601 Lind Avenue, SW., Renton,
[[Page 300]]
Washington 98055-4056; telephone (425) 917-6481; fax (425) 917-6590.
SUPPLEMENTARY INFORMATION:
Comments Invited
Interested persons are invited to participate in the making of the
proposed rule by submitting such written data, views, or arguments as
they may desire. Communications shall identify the Rules Docket number
and be submitted in triplicate to the address specified above. All
communications received on or before the closing date for comments,
specified above, will be considered before taking action on the
proposed rule. The proposals contained in this action may be changed in
light of the comments received.
Submit comments using the following format:
Organize comments issue-by-issue. For example, discuss a
request to change the compliance time and a request to change the
service bulletin reference as two separate issues.
For each issue, state what specific change to the proposed
AD is being requested.
Include justification (e.g., reasons or data) for each
request.
Comments are specifically invited on the overall regulatory,
economic, environmental, and energy aspects of the proposed rule. All
comments submitted will be available, both before and after the closing
date for comments, in the Rules Docket for examination by interested
persons. A report summarizing each FAA-public contact concerned with
the substance of this proposal will be filed in the Rules Docket.
Commenters wishing the FAA to acknowledge receipt of their comments
submitted in response to this action must submit a self-addressed,
stamped postcard on which the following statement is made: ``Comments
to Docket Number 2000-NM-360-AD.'' The postcard will be date stamped
and returned to the commenter.
Availability of NPRMs
Any person may obtain a copy of this NPRM by submitting a request
to the FAA, Transport Airplane Directorate, ANM-114, Attention: Rules
Docket No. 2000-NM-360-AD, 1601 Lind Avenue, SW., Renton, Washington
98055-4056.
Discussion
A proposal to amend part 39 of the Federal Aviation Regulations (14
CFR part 39) to add an airworthiness directive (AD), applicable to
Boeing Model 747-400, 777-200, and 777-300 series airplanes, equipped
with a Hamilton Sundstrand flight deck humidifier, was published as a
supplemental notice of proposed rulemaking (referred to hereafter as
the first SNPRM) in the Federal Register on January 6, 2005 (70 FR
1211).
The first SNPRM would have required an inspection of the flight
deck humidifier to determine certain part numbers. The first SNPRM also
would have required, for certain airplanes, replacing the cell stack of
the flight deck humidifier with a supplier-tested cell stack, or
replacing the cell stack with an end plate and subsequent deactivation
of the flight deck humidifier, if necessary. For other airplanes, the
first SNPRM would have required replacing the cell stack with a
supplier-tested cell stack, or replacing the cell stack with a blanking
plate and subsequent deactivation of the humidifier system, if
necessary. The first SNPRM also would have allowed end plates or
blanking plates to be replaced with cell stacks.
The first SNPRM was prompted by reports of sagging cell stack
membranes of the flight deck humidifiers. That condition, if not
corrected, could result in an increased pressure drop across the
humidifier and consequent reduced airflow to the flight deck, which
could result in the inability to clear any smoke that might appear in
the flight deck.
Actions Since Issuance of First SNPRM
Since the issuance of the first SNPRM, Boeing has issued Boeing
Alert Service Bulletin 747-21A2414, Revision 2, dated July 7, 2005
(Revision 1, dated October 26, 2000, was referenced as an applicable
source of service information for doing the actions in that SNPRM); and
Boeing Alert Service Bulletin 777-21A0048, Revision 2, dated July 14,
2005 (Revision 1, dated September 7, 2000, was referenced as an
applicable source of service information for doing the actions in the
first SNPRM). Revision 2 of the alert service bulletins contains
essentially the same procedures for the replacement of certain cell
stacks of the flight deck humidifier. However, Revision 2 of the alert
service bulletins adds airplanes to the effectivity. For those
airplanes, Revision 2 of the alert service bulletin adds a procedure to
inspect for a certain flight deck humidifier and inspect for a certain
cell stack if necessary. Revision 2 of the alert service bulletins also
specifies on which airplanes the replacement should be accomplished.
We have made the following changes to the first SNPRM:
We have revised the applicability of this second SNPRM to
reference Revision 2 of the alert service bulletins.
We have referenced Revision 2 of the alert service
bulletins as the appropriate source of service information for
accomplishing the cell stack replacements.
We have also revised the format of this second SNPRM to
clarify that a new or supplier-tested cell stack may be installed on
flight deck humidifiers that have a blanking plate; paragraphs (a) and
(d) of this second SNPRM (cited as paragraphs (b) and (e) of the first
SNPRM) include the information on blanking plate replacement that was
specified in paragraphs (b)(3) and (e)(3) of the first SNPRM. In
addition, for the blanking plate replacement specified in paragraph (a)
of this second SNPRM, we specify that the replacement be done in
accordance with Hamilton Sundstrand Service Bulletin 821486-21-01,
dated March 15, 2000, and that if the flight deck humidifier is
activated after the replacement, the humidifier must be activated in
accordance with Boeing Service Bulletin 747-21-2405, Revision 4, dated
July 29, 1999.
We have revised the format of this second SNPRM to require
that certain airplanes do the inspections for part numbers and then
replace the cell stack if necessary and that certain other airplanes
replace the cell stack. Revision 2 of the alert service bulletins
specifies on which airplanes (identified according to groups in the
alert service bulletins) to do the inspection and then the replacement
if necessary, and on which airplanes to do the replacement.
We have revised the cost estimate of this second SNPRM.
Comments
We have also given due consideration to the comments received in
response to the first SNPRM.
Request To Revise Number of Affected Airplanes
One commenter, the manufacturer, requests that the number of
airplanes that could be fitted with the potentially defective cell
stack be revised from 114 airplanes, as stated in the ``Request to
Withdraw the Proposed AD'' section of the first SNPRM, to 176
airplanes. The commenter states that 176 humidifiers have been
delivered that could have the potentially defective cell stacks.
We agree with the commenter that the total number of airplanes that
could be fitted with the potentially defective cell stack is 176. We
have revised the number in the Cost Impact section of this second
SNPRM.
Request To Allow Additional Records Review
The same commenter requests that we add an additional records
review to allow operators to show compliance
[[Page 301]]
with the intent of the first SNPRM. The commenter states that if an
airplane or retrofit kit was delivered after December 16, 1999, and the
record review shows that the humidifier or cell stack was not replaced
since, no inspection or replacement of the humidifier is needed. The
commenter notes that December 16, 1999 is the delivery date of the
first airplane that was delivered with an acceptable cell stack that
was screened in production. The commenter contends that all humidifier
deliveries would thereafter contain a cell stack that is not
susceptible to the unsafe condition.
We partially agree with the commenter. We acknowledge that
airplanes delivered after December 16, 1999, would not require that the
humidifier be inspected or replaced if there has not been any
maintenance on the humidifier and the appropriate part markings could
be determined. However, we have not revised the requirements for the
records review specified in the first SNPRM since this review would
include airplanes delivered with a known good cell stack. As specified
in paragraphs (c) and (f) of this second SNPRM, a records review would
be allowed in lieu of the inspection.
Request To Revise Nomenclature
The same commenter requests that the term ``end plate'' in the
first SNPRM be revised to ``blanking plate.'' The commenter states that
an end plate is actually a part that exists in the cell stack assembly,
while a blanking plate is a part that can be installed in lieu of the
cell stack. The commenter recommends that the first SNPRM describe part
number (P/N) 1001157-1 as a blanking plate.
We agree with the commenter. Where the first SNPRM specifies an end
plate, we have revised this second SNPRM to specify a blanking plate.
Clarification of P/Ns
Boeing Alert Service Bulletin 747-21A2414, Revision 2, dated July
7, 2005, specifies the cell stack P/N as 103111-2 in paragraph 3. of
``Group 2-3: Part 3--Cell Stack Part Number Inspection'' of the
Accomplishment Instructions of the service bulletin. The correct P/N is
1003111-2.
Boeing Alert Service Bulletin 777-21A0048, Revision 2, dated July
14, 2005, specifies the cell stack P/N as 10311-1 in paragraph 2.C. of
``Parts Necessary For Each Airplane'' and 2.D. of ``Parts Necessary to
Change Spares'' of the service bulletin. The correct P/N is 1003111-1.
Explanation of Change Made to This AD
We have revised paragraph (d)(1) of this second SNPRM to clarify
the delegation authority for Authorized Representatives for the Boeing
Commercial Airplanes Delegation Option Authorization.
Clarification of Alternative Method of Compliance (AMOC) Paragraph
We have revised this second SNPRM to clarify the appropriate
procedure for notifying the principal inspector before using any
approved AMOC on any airplane to which the AMOC applies.
Conclusion
Since this change expands the scope of this second SNPRM, the FAA
has determined that it is necessary to reopen the comment period to
provide additional opportunity for public comment.
Cost Impact
There are approximately 176 airplanes of the affected design in the
worldwide fleet. The FAA estimates that 29 airplanes of U.S. registry
would be affected by this second SNPRM. The cost per airplane would
range between $390 and $6,248 per airplane, depending on the actions
chosen by the operator. The fleet cost estimate would not exceed
$181,192.
Estimated Costs
----------------------------------------------------------------------------------------------------------------
Cost per
Model/series Action Work hours Hourly rate Parts cost airplane
----------------------------------------------------------------------------------------------------------------
747-400, 777-200, 777-300........... Inspect flight deck 1 $65 $0 $65
humidifier for part
number and inspect
flight deck
humidifier cell stack
for part number.
747-400............................. Replace cell stack 3 65 5,100 5,295
with new or supplier-
tested cell stack.
747-400............................. Replace cell stack 5 65 0 325
with blanking plate
and deactivate
humidifier.
777-200, 777-300.................... Replace cell stack 3 65 0 195
with blanking plate.
777-200, 777-300.................... Replace cell stack 3 65 6,053 6,248
with new or supplier-
tested cell stack.
777-200, 777-300.................... Replace blanking plate 1 65 6,053 6,118
with supplier-tested
cell stack.
----------------------------------------------------------------------------------------------------------------
The cost impact figures discussed above are based on assumptions
that no operator has yet accomplished any of the proposed requirements
of this AD action, and that no operator would accomplish those actions
in the future if this AD were not adopted. The cost impact figures
discussed in AD rulemaking actions represent only the time necessary to
perform the specific actions actually required by the AD. These figures
typically do not include incidental costs, such as the time required to
gain access and close up, planning time, or time necessitated by other
administrative actions.
Authority for This Rulemaking
Title 49 of the United States Code specifies the FAA's authority to
issue rules on aviation safety. Subtitle I, section 106, describes the
authority of the FAA Administrator. Subtitle VII, Aviation Programs,
describes in more detail the scope of the Agency's authority.
We are issuing this rulemaking under the authority described in
subtitle VII, part A, subpart III, section 44701, ``General
requirements.'' Under that section, Congress charges the FAA with
promoting safe flight of civil aircraft in air commerce by prescribing
regulations for practices, methods, and procedures the Administrator
finds necessary for safety in air commerce. This regulation is within
the scope of that authority because it addresses an unsafe condition
that is likely to exist or develop on products identified in this
rulemaking action.
[[Page 302]]
Regulatory Impact
The regulations proposed herein would not have a substantial direct
effect on the States, on the relationship between the national
Government and the States, or on the distribution of power and
responsibilities among the various levels of government. Therefore, it
is determined that this proposal would not have federalism implications
under Executive Order 13132.
For the reasons discussed above, I certify that this proposed
regulation (1) is not a ``significant regulatory action'' under
Executive Order 12866; (2) is not a ``significant rule'' under the DOT
Regulatory Policies and Procedures (44 FR 11034, February 26, 1979);
and (3) if promulgated, will not have a significant economic impact,
positive or negative, on a substantial number of small entities under
the criteria of the Regulatory Flexibility Act. A copy of the draft
regulatory evaluation prepared for this action is contained in the
Rules Docket. A copy of it may be obtained by contacting the Rules
Docket at the location provided under the caption ADDRESSES.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Safety.
The Proposed Amendment
Accordingly, pursuant to the authority delegated to me by the
Administrator, the Federal Aviation Administration proposes to amend
part 39 of the Federal Aviation Regulations (14 CFR part 39) as
follows:
PART 39--AIRWORTHINESS DIRECTIVES
1. The authority citation for part 39 continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
Boeing: Docket 2000-NM-360-AD.
Applicability: Model 747-400, 777-200, and 777-300 series
airplanes, certificated in any category; as identified in Boeing
Alert Service Bulletin 747-21A2414, Revision 2, dated July 7, 2005;
and Boeing Alert Service Bulletin 777-21A0048, Revision 2, dated
July 14, 2005.
Compliance: Required as indicated, unless accomplished
previously.
To prevent an increased pressure drop across the humidifier and
consequent reduced airflow to the flight deck, which could result in
the inability to clear any smoke that might appear in the flight
deck, accomplish the following:
Cell Stack Replacement: Model 747-400 Series Airplanes
(a) For Model 747-400 series airplanes identified as Group 1 in
Boeing Alert Service Bulletin 747-21A2414, Revision 2, dated July 7,
2005: Within 90 days after the effective date of this AD, do the
replacement specified in paragraph (a)(1) or (a)(2) of this AD. For
flight deck humidifiers with a blanking plate: If the blanking plate
is removed and a new or supplier-tested cell stack is installed, the
replacement must be done in accordance with the Accomplishment
Instructions of Hamilton Sundstrand Service Bulletins 821486-21-01,
dated March 15, 2000; and after the replacement, the flight deck
humidifier may be activated in accordance with the Accomplishment
Instructions of Boeing Service Bulletin 747-21-2405, Revision 4,
dated July 29, 1999.
(1) Replace the cell stack of the flight deck humidifier with a
supplier-tested cell stack, in accordance with Part 1 of the
Accomplishment Instructions of Boeing Alert Service Bulletin 747-
21A2414, Revision 2, dated July 7, 2005.
(2) Replace the cell stack of the flight deck humidifier with a
blanking plate and, before further flight, deactivate the flight
deck humidifier, in accordance with Part 2 of the Accomplishment
Instructions of Boeing Alert Service Bulletin 747-21A2414, Revision
2, dated July 7, 2005.
Note 1: Boeing Alert Service Bulletin 747-21A2414, Revision 2,
dated July 7, 2005, refers to Boeing Service Bulletin 747-21-2405,
Revision 4, dated July 29, 1999, as an additional source of service
information for deactivating the humidifier.
Note 2: Boeing Alert Service Bulletin 747-21A2414, Revision 2,
dated July 7, 2005, refers to Hamilton Sundstrand Service Bulletins
821486-21-01, dated March 15, 2000, as an additional source of
service information for the cell stack replacements.
(b) Replacement of the cell stack before the effective date of
this AD in accordance with Boeing Alert Service Bulletin 747-
21A2414, dated April 13, 2000; or Revision 1, dated October 26,
2000; is acceptable for compliance with the applicable requirements
of paragraphs (a)(1) and (a)(2) of this AD.
Inspections/Records Review: Model 747-400 Series Airplanes
(c) For Model 747-400 series airplanes identified as Groups 2
and 3 in Boeing Alert Service Bulletin 747-21A2414, Revision 2,
dated July 7, 2005: Within 90 days after the effective date of this
AD, inspect the flight deck humidifier to determine whether part
number (P/N) 821486-1 is installed, in accordance with Part 3 of the
Accomplishment Instructions of Boeing Alert Service Bulletin 747-
21A2414, Revision 2, dated July 7, 2005. Instead of inspecting the
flight deck humidifier, a review of airplane maintenance records is
acceptable if the P/N of the flight deck humidifier can be
positively determined from that review.
(1) If a P/N other than P/N 821486-1 is installed, no further
action is required by this paragraph.
(2) If P/N 821486-1 is installed, inspect the flight deck
humidifier cell stack to determine whether P/N 821482-1 is installed
and ``DEV 13433'' is not marked next to the cell stack part number,
in accordance with Part 3 of the Accomplishment Instructions of the
alert service bulletin. Instead of inspecting the flight deck
humidifier cell stack, a review of airplane maintenance records is
acceptable if the P/N, including whether ``DEV 13433'' is marked
next to the P/N, of the flight deck humidifier cell stack can be
positively determined from that review.
(i) If the cell stack has P/N 821482-2 or 1003111-2, or if ``DEV
13433'' is marked next to P/N 821482-1, no further action is
required by this paragraph.
(ii) If the cell stack has P/N 821482-1 and does not have ``DEV
13433'' marked next to the cell stack part number: Before further
flight, do the replacement specified in paragraph (a) of this AD.
Cell Stack Replacement: Model 777-200 and -300 Series Airplanes
(d) For Model 777-200 and 777-300 series airplanes identified as
Groups 1 through 5 in Boeing Alert Service Bulletin 777-21A0048,
Revision 2, dated July 14, 2005: Within 90 days after the effective
date of this AD, do the replacement specified in paragraph (d)(1) or
(d)(2) of this AD. For flight deck humidifiers with a blanking
plate: If a blanking plate is removed and a new or supplier-tested
cell stack installed, the cell stack installation must be done in
accordance with Part 3 of the Accomplishment Instructions of Boeing
Alert Service Bulletin 777-21A0048, Revision 2, dated July 14, 2005;
and after the installation, the humidifier system may be activated
in accordance with Accomplishment Instructions of Boeing Service
Bulletin 777-21-0035, Revision 1, dated October 19, 2000.
(1) Replace the cell stack with a blanking plate, in accordance
with Part 1 of the Accomplishment Instructions of Boeing Alert
Service Bulletin 777-21A0048, Revision 2, dated July 14, 2005; and,
before further flight, deactivate the humidifier system in
accordance with a method approved by the Manager, Seattle Aircraft
Certification Office (ACO), FAA, or in accordance with data meeting
the certification basis of the airplane approved by an Authorized
Representative for the Boeing Commercial Airplanes Delegation Option
Authorization who has been authorized by the Manager, Seattle ACO,
to make those findings. For a deactivation method to be approved,
the deactivation must meet the certification basis of the airplane,
and the approval must specifically reference this AD.
(2) Replace the cell stack with a supplier-tested cell stack, in
accordance with Part 2 of the Accomplishment Instructions of Boeing
Alert Service Bulletin 777-21A0048, Revision 2, dated July 14, 2005.
Note 3: Boeing Alert Service Bulletin 777-21A0048, Revision 2,
dated July 14, 2005, refers to Hamilton Sundstrand Service Bulletin
816086-21-01, dated March 15, 2000, as an additional source of
service information for the cell stack replacement.
(e) Replacement of the cell stack before the effective date of
this AD in accordance with Boeing Service Bulletin 777-21A0048,
Revision 1, dated September 7, 2000, is
[[Page 303]]
acceptable for compliance with the applicable requirements of
paragraphs (d)(1) and (d)(2) of this AD.
Inspections/Records Review: Model 777-200 and -300 Series Airplanes
(f) For Model 777-200 and 777-300 series airplanes identified as
Groups 6 and 7 in Boeing Alert Service Bulletin 777-21A0048,
Revision 2, dated July 14, 2005: Within 90 days after the effective
date of this AD, inspect the flight deck humidifier to determine if
it is P/N 816086-1, in accordance with Part 4 of the Accomplishment
Instructions of Boeing Alert Service Bulletin 777-21A0048, Revision
2, dated July 14, 2005. Instead of inspecting the flight deck
humidifier, a review of airplane maintenance records is acceptable
if the part number (P/N) of the flight deck humidifier can be
positively determined from that review.
(1) If a P/N other than P/N 816086-1 is installed, no further
action is required by this paragraph.
(2) If P/N 816086-1 is installed, inspect the flight deck
humidifier cell stack to determine whether P/N 822976-2 is installed
and ``DEV 13433'' is not marked next to the cell stack part number,
in accordance with Part 4 of the Accomplishment Instruction of the
alert service bulletin. Instead of inspecting the flight deck
humidifier cell stack, a review of airplane maintenance records is
acceptable if the P/N, including whether ``DEV 13433'' is marked
next to the P/N, of the flight deck humidifier cell stack can be
positively determined from that review.
(i) If the cell stack has P/N 822976-3 or 1003111-1, or if ``DEV
13433'' is marked next to P/N 822976-2, no further action is
required by this paragraph.
(ii) If the cell stack has P/N 822976-2 and does not have ``DEV
13433'' marked next to the cell stack part number, before further
flight, do the replacement specified in paragraph (d) of this AD.
Parts Installation
(g) On Model 747-400 series airplanes: As of the effective date
of this AD, no person may install a flight deck humidifier cell
stack having P/N 821482-1, unless ``DEV 13433'' is also marked next
to the cell stack part number.
(h) On Model 777-200 and 777-300 series airplanes: As of the
effective date of this AD, no person may install a flight deck
humidifier cell stack having P/N 822976-2, unless ``DEV 13433'' is
also marked next to the cell stack part number.
Alternative Methods of Compliance
(1) In accordance with 14 CFR 39.19, the Manager, Seattle ACO,
is authorized to approve alternative methods of compliance for this
AD.
(2) Before using any AMOC approved in accordance with 14 CFR
39.19 on any airplane to which the AMOC applies, notify the
appropriate principal inspector in the FAA Flight Standards
Certificate Holding District Office.
Issued in Renton, Washington, on December 27, 2005.
Ali Bahrami,
Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E5-8244 Filed 1-3-06; 8:45 am]
BILLING CODE 4910-13-P
