Airworthiness Directives; Learjet Model 45 Airplanes, 36255-36257 [E6-10004]
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Federal Register / Vol. 71, No. 122 / Monday, June 26, 2006 / Proposed Rules
on the ground or an in-flight engine
shutdown, accomplish the following:
Modification/Repetitive Inspections
(a) Within 12 months after the effective
date of this AD: Modify the hot detection
system of the tail pipe harness of the engine
nacelles (including a general visual
inspection of the heat shrink sleeve,
thixotropic sealant, and connectors for
damage and/or corrosion, and all applicable
repairs), by doing all the actions specified in
the Accomplishment Instructions of Saab
Service Bulletin 340–26–030, Revision 01,
dated November 14, 2003. All applicable
repairs must be done before further flight in
accordance with the service bulletin. Repeat
the general visual inspection thereafter at
intervals not to exceed 12 months.
Note 1: For the purposes of this AD, a
general visual inspection is defined as: ‘‘A
visual examination of an interior or exterior
area, installation, or assembly to detect
obvious damage, failure, or irregularity. This
level of inspection is made from within
touching distance unless otherwise specified.
A mirror may be necessary to enhance visual
access to all exposed surfaces in the
inspection area. This level of inspection is
made under normally available lighting
conditions such as daylight, hangar lighting,
flashlight, or droplight and may require
removal or opening of access panels or doors.
Stands, ladders, or platforms may be required
to gain proximity to the area being checked.’’
Alternative Methods of Compliance
(AMOCs)
(d)(1) In accordance with 14 CFR 39.19, the
Manager, International Branch, ANM–116,
Transport Airplane Directorate, FAA, is
authorized to approve AMOCs 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.
Note 2: The subject of this AD is addressed
in Swedish airworthiness directive 1–184,
dated October 28, 2002.
Issued in Renton, Washington, on June 19,
2006.
Ali Bahrami,
Manager, Transport Airplane Directorate,
Aircraft Certification Service.
[FR Doc. E6–10014 Filed 6–23–06; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2006–25174; Directorate
Identifier 2005–NM–007–AD]
RIN 2120–AA64
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(b) Accomplishing the modification/
repetitive inspections specified in Saab
Service Bulletin 340–26–030, dated October
28, 2002; or Saab Service Bulletins 340–26–
018, Revision 02, and 340–26–029, both
dated October 28, 2002; before the effective
date of this AD, is considered acceptable for
compliance with the modification required
by paragraph (a) of this AD.
Airworthiness Directives; Learjet
Model 45 Airplanes
Reporting Requirement
(c) Within 30 days after any false warning
indication to the flightcrew from the hot
detection system of the tail pipe harness of
the engine nacelles occurs: Submit a report
containing the information specified in
paragraphs (c)(1), (c)(2), (c)(3), and (c)(4) of
this AD to the Swedish Civil Aviation
Authority (Luftfartsstyrelsen)—Attn: Mr.
Christer Sundqvist, SAAB 340 Certification
¨
Manager, SE–601 79, Norrkoping, Sweden.
Under the provisions of the Paperwork
Reduction Act (44 U.S.C. 3501 et seq.), the
Office of Management and Budget (OMB) has
approved the information collection
requirements contained in this AD and has
assigned OMB Control Number 2120–0056.
(1) The date and time, weather conditions,
and phase of flight of the warning.
(2) The action taken by the crew to address
the warning (aborted takeoff, high speed/high
energy abort requiring inspection, return for
landing, in-flight diversion, declared
emergency, ATC priority handling requested
or given, or engine shutdown).
(3) The action taken by maintenance to
address/correct the warning.
(4) Time-in-service on the airplane since
the last inspection accomplished in
accordance with paragraph (a) of this AD.
SUMMARY: The FAA proposes to adopt a
new airworthiness directive (AD) for
certain Learjet Model 45 airplanes. This
proposed AD would require revising the
Airworthiness Limitations section of the
airplane maintenance manual to
incorporate certain inspections and
compliance times to detect fatigue
cracking of certain principal structural
elements (PSEs). This proposed AD
results from new and more restrictive
life limits and inspection intervals for
certain PSEs. We are proposing this AD
to ensure that fatigue cracking of various
PSEs is detected and corrected; such
fatigue cracking could adversely affect
the structural integrity of these
airplanes.
DATES: We must receive comments on
this proposed AD by August 10, 2006.
ADDRESSES: Use one of the following
addresses to submit comments on this
proposed AD.
• DOT Docket Web site: Go to
https://dms.dot.gov and follow the
instructions for sending your comments
electronically.
VerDate Aug<31>2005
21:18 Jun 23, 2006
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Federal Aviation
Administration (FAA), Department of
Transportation (DOT).
ACTION: Notice of proposed rulemaking
(NPRM).
AGENCY:
PO 00000
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36255
• Government-wide rulemaking Web
site: Go to https://www.regulations.gov
and follow the instructions for sending
your comments electronically.
• Mail: Docket Management Facility,
U.S. Department of Transportation, 400
Seventh Street, SW., Nassif Building,
Room PL–401, Washington, DC 20590.
• Fax: (202) 493–2251.
• Hand Delivery: Room PL–401 on
the plaza level of the Nassif Building,
400 Seventh Street, SW., Washington,
DC, between 9 a.m. and 5 p.m., Monday
through Friday, except Federal holidays.
Contact Learjet, Inc., One Learjet Way,
Wichita, Kansas 67209–2942, for the
service information identified in this
proposed AD.
FOR FURTHER INFORMATION CONTACT:
Steve Litke, Aerospace Engineer,
Airframe Branch, ACE–118W, FAA,
Wichita Aircraft Certification Office,
1801 Airport Road, Room 100, MidContinent Airport, Wichita, Kansas
67209; telephone (316) 946–4127; fax
(316) 946–4107.
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to submit any relevant
written data, views, or arguments
regarding this proposed AD. Send your
comments to an address listed in the
ADDRESSES section. Include the docket
number ‘‘FAA–2006–25174; Directorate
Identifier 2005–NM–007–AD’’ at the
beginning of your comments. We
specifically invite comments on the
overall regulatory, economic,
environmental, and energy aspects of
the proposed AD. We will consider all
comments received by the closing date
and may amend the proposed AD in
light of those comments.
We will post all comments we
receive, without change, to https://
dms.dot.gov, including any personal
information you provide. We will also
post a report summarizing each
substantive verbal contact with FAA
personnel concerning this proposed AD.
Using the search function of that Web
site, anyone can find and read the
comments in any of our dockets,
including the name of the individual
who sent the comment (or signed the
comment on behalf of an association,
business, labor union, etc.). You may
review DOT’s complete Privacy Act
Statement in the Federal Register
published on April 11, 2000 (65 FR
19477–78), or you may visit https://
dms.dot.gov.
Examining the Docket
You may examine the AD docket on
the Internet at https://dms.dot.gov, or in
person at the Docket Management
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Federal Register / Vol. 71, No. 122 / Monday, June 26, 2006 / Proposed Rules
Facility office between 9 a.m. and 5
p.m., Monday through Friday, except
Federal holidays. The Docket
Management Facility office (telephone
(800) 647–5227) is located on the plaza
level of the Nassif Building at the DOT
street address stated in the ADDRESSES
section. Comments will be available in
the AD docket shortly after the Docket
Management System receives them.
Discussion
As service experience is accumulated
on airplanes or as the result of postcertification testing and evaluation, it
may become necessary to revise removal
limits for removal of certain life-limited
components of the airplane or revise the
interval for certain structural
inspections in order to ensure the
continued structural integrity of the
airplane. The manufacturer may revise
the Airworthiness Limitations
document to include more restrictive
life limits or revise repetitive intervals
for certain non-destructive inspection
(NDI) techniques and procedures for
each principal structural element (PSE).
For the purposes of this airworthiness
directive, a PSE is defined as an element
of structure that contributes
significantly to carrying flight, ground,
and pressurization loads. If a failure
occurs on any of those PSEs, it could
adversely affect the structural integrity
of the airplane.
The actions specified by the proposed
AD are intended to ensure that fatigue
cracking of various PSEs is detected and
corrected; such fatigue cracking could
adversely affect the structural integrity
of these airplanes.
wwhite on PROD1PC61 with PROPOSALS
New Revisions of Airworthiness
Limitations Sections (ALS)
We have reviewed Chapter 4,
‘‘Airworthiness Limitations,’’ of the
Learjet 40 Maintenance Manual (MM),
Revision 6, dated April 24, 2006; and
Chapter 4, ‘‘Airworthiness Limitations,’’
of the Learjet 45 MM, Revision 38, dated
April 24, 2006. These MM chapters add
new and more restrictive life limits and
inspection intervals for certain PSEs.
PSEs include, but are not limited to,
door cutouts, windshields, skin
sections, bolts, and attachment
hardware. The MM chapters explicitly
identify all of the PSEs that are to be
inspected in accordance with the
requirements of the Airworthiness
Limitations section (ALS).
Accomplishing the actions specified in
these chapters is intended to adequately
address the unsafe condition.
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FAA’s Determination and Requirements
of the Proposed AD
We have evaluated all pertinent
information and identified an unsafe
condition that is likely to exist or
develop on other airplanes of this same
type design. For this reason, we are
proposing this AD, which would require
revising the ALS of the MM to
incorporate certain inspections and
compliance times to detect fatigue
cracking of certain PSEs.
Clarification of Model Designations
Certain Learjet Model 45 airplanes are
also referred to as Model 45 (Learjet 40)
airplanes. Model 45 (Learjet 40)
airplanes have serial numbers (S/Ns)
45–2001 through 45–4000 inclusive.
The remainder of the Learjet Model 45
airplanes are referred to as Model 45
(Learjet 45) airplanes, and have S/Ns
45–002 through 45–2000 inclusive.
on the distribution of power and
responsibilities among the various
levels of government.
For the reasons discussed above, I
certify that the 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. 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.
We prepared a regulatory evaluation
of the estimated costs to comply with
this proposed AD and placed it in the
AD docket. See the ADDRESSES section
for a location to examine the regulatory
evaluation.
List of Subjects in 14 CFR Part 39
Costs of Compliance
There are about 230 airplanes of the
affected design in the worldwide fleet.
This proposed AD would affect about
171 airplanes of U.S. registry. The
proposed actions would take about 1
work hour per airplane, at an average
labor rate of $80 per work hour. Based
on these figures, the estimated cost of
the proposed AD for U.S. operators is
$13,680, or $80 per airplane.
Air transportation, Aircraft, Aviation
safety, Safety.
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.
1. The authority citation for part 39
continues to read as follows:
Regulatory Findings
We have determined that this
proposed AD would not have federalism
implications under Executive Order
13132. This proposed AD would not
have a substantial direct effect on the
States, on the relationship between the
national Government and the States, or
Unsafe Condition
(d) This AD results from new and more
restrictive life limits and inspection intervals
for certain principal structural elements
(PSEs). We are issuing this AD to ensure that
fatigue cracking of various PSEs is detected
and corrected; such fatigue cracking could
adversely affect the structural integrity of
these airplanes.
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The Proposed Amendment
Accordingly, under the authority
delegated to me by the Administrator,
the FAA proposes to amend 14 CFR part
39 as follows:
PART 39—AIRWORTHINESS
DIRECTIVES
Authority: 49 U.S.C. 106(g), 40113, 44701.
§ 39.13
[Amended]
2. The Federal Aviation
Administration (FAA) amends § 39.13
by adding the following new
airworthiness directive (AD):
Learjet: Docket No. FAA–2006–25174;
Directorate Identifier 2005–NM–007–AD.
Comments Due Date
(a) The FAA must receive comments on
this AD action by August 10, 2006.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Learjet Model 45
airplanes, certificated in any category; serial
numbers (S/Ns) 45–002 through 45–233
inclusive, and S/Ns 45–2001 through 45–
2031 inclusive.
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Federal Register / Vol. 71, No. 122 / Monday, June 26, 2006 / Proposed Rules
Compliance
DEPARTMENT OF TRANSPORTATION
(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.
Note 1: This AD requires revisions to
certain operator maintenance documents to
include new inspections. Compliance with
these inspections is required by 14 CFR
91.403(c). For airplanes that have been
previously modified, altered, or repaired in
the areas addressed by these inspections, the
operator may not be able to accomplish the
inspections described in the revisions. In this
situation, to comply with 14 CFR 91.403(c),
the operator must request approval for an
alternative method of compliance (AMOC)
according to paragraph (g) of this AD. The
request should include a description of
changes to the required inspections that will
ensure the continued damage tolerance of the
affected structure. The FAA has provided
guidance for this determination in Advisory
Circular (AC) 25–1529.
Revise the Airworthiness Limitations
Section (ALS)
(f) Within 30 days after the effective date
of this AD, revise the ALS of the airplane
maintenance manual (AMM) to include new
life limits and inspection intervals according
to a method approved by the Manager,
Wichita Aircraft Certification Office (ACO),
FAA. Incorporating the applicable chapters
in paragraph (f)(1) or (f)(2) of this AD in the
AMM is one approved method for doing the
revision. Thereafter, except as provided in
paragraph (g) of this AD, no alternative life
limits or inspection intervals may be
approved for the affected PSEs.
(1) For Learjet Model 45 airplanes, S/Ns
45–002 through 45–233 inclusive: Chapter 4
of the Learjet 45 Maintenance Manual,
Revision 38, dated April 24, 2006.
(2) For Learjet Model 45 airplanes, S/Ns
45–2001 through 45–2031 inclusive: Chapter
4 of the Learjet 40 Maintenance Manual,
Revision 6, dated April 24, 2006.
AMOCs
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(g)(1) The Manager, Wichita ACO, 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.
Issued in Renton, Washington, on June 14,
2006.
Kalene C. Yanamura,
Acting Manager, Transport Airplane
Directorate, Aircraft Certification Service.
[FR Doc. E6–10004 Filed 6–23–06; 8:45 am]
BILLING CODE 4910–13–P
VerDate Aug<31>2005
21:18 Jun 23, 2006
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Federal Aviation Administration
14 CFR Part 71
[Docket No. FAA–2006–25059; Airspace
Docket No. 06–ACE–8]
Proposed Establishment of Class E5
Airspace; Higginsville, MO
Federal Aviation
Administration (FAA), DOT.
ACTION: Notice of proposed rulemaking.
AGENCY:
This notice proposes to
amend part 71 of the Federal Aviation
Regulations (14 CFR part 71) by
establishing a Class E airspace area
extending upward from 700 feet above
the surface at Higginsville Industrial
Municipal Airport, MO.
DATES: Comments for inclusion in the
Rules Docket must be received on or
before August 1, 2006.
ADDRESSES: Send comments on this
proposal to the Docket Management
System, U.S. Department of
Transportation, Room Plaza 401, 400
Seventh Street, SW., Washington, DC
20590–0001. You must identify the
docket number FAA–2006–25059/
Airspace Docket No. 06–ACE–8, at the
beginning of your comments. You may
also submit comments on the Internet at
https://dms.dot.gov. You may review the
public docket containing the proposal,
any comments received, and any final
disposition in person the Dockets Office
between 9 a.m. and 5 p.m., Monday
through Friday, except Federal holidays.
The Docket Office (telephone 1–800–
647–5527) is on the plaza level of the
Department of Transportation NASSIF
Building at the above address.
FOR FURTHER INFORMATION CONTACT:
Brenda Mumper, Air Traffic Division,
Airspace Branch, ACE–520A, DOT
Regional Headquarters Building, Federal
Aviation Administration, 901 Locust,
Kansas City, MO 64106; telephone:
(816) 329–2524.
SUPPLEMENTARY INFORMATION:
SUMMARY:
Comments Invited
Interested parties are invited to
participate in this proposed rulemaking
by submitting such written data, views,
or arguments, as they may desire.
Comments that provide the factual basis
supporting the views and suggestions
presented are particularly helpful in
developing reasoned regulatory
decisions on the proposal. Comments
are specifically invited on the overall
regulatory, aeronautical, economic,
environmental, and energy-related
aspects of the proposal.
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36257
Communications should identify both
docket numbers and be submitted in
triplicate to the address listed above.
Commenters wishing the FAA to
acknowledge receipt of their comments
on this notice must submit with those
comments a self-addressed, stamped
postcard on which the following
statement is made: ‘‘Comments to
Docket No. FAA–2006–25059/Airspace
Docket No. 06–ACE–8.’’ The postcard
will be date/time stamped and returned
to the commenter.
Availability of NPRM’s
An electronic copy of this document
may be downloaded through the
Internet at https://dms.dot.gov. Recently
published rulemaking documents can
also be accessed through the FAA’s Web
page at https://www.faa.gov or the
Superintendent of Document’s Web
page at https://www.access.gpo.gov/nara.
Additionally, any person may obtain
a copy of this notice by submitting a
request to the Federal Aviation
Administration (FAA), Office of Air
Traffic Airspace Management, ATA–
400, 800 Independence Avenue, SW.,
Washington, DC 20591, or by calling
(202) 267–8783. Communications must
identify both docket number for this
notice. Persons interested in being
placed on a mailing list for future
NPRM’s should contact the FAA’s
Office of Rulemaking (202) 267–9677, to
request a copy of Advisory Circular No.
11–2A, Notice of Proposed Rulemaking
Distribution System, which describes
the application procedure.
The Proposal
This notice proposes to amend part 71
of the Federal Aviation Regulations (14
CFR part 71) by establishing a Class E
airspace area extending upward from
700 feet above the surface at
Higginsville Industrial Municipal
Airport, MO. The establishment of Area
Navigation (RNAV) Global Positioning
System (GPS) Instrument Approach
Procedures (IAP) to Runways 16 and 34
have made this action necessary. The
intended effect of this proposal is to
provide adequate controlled airspace for
Instrument Flight Rules operations at
Higginsville Industrial Municipal
Airport, MO. The area would be
depicted on appropriate aeronautical
charts.
Class E airspace areas extending
upward from 700 feet or more above the
surface of the earth are published in
Paragraph 6005 of FAA Order 7400.9N,
dated September 1, 2005, and effective
September 16, 2005, which is
incorporated by reference in 14 CFR
71.1. The Class E airspace designations
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]]>Agencies
[Federal Register Volume 71, Number 122 (Monday, June 26, 2006)]
[Proposed Rules]
[Pages 36255-36257]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E6-10004]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2006-25174; Directorate Identifier 2005-NM-007-AD]
RIN 2120-AA64
Airworthiness Directives; Learjet Model 45 Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Notice of proposed rulemaking (NPRM).
-----------------------------------------------------------------------
SUMMARY: The FAA proposes to adopt a new airworthiness directive (AD)
for certain Learjet Model 45 airplanes. This proposed AD would require
revising the Airworthiness Limitations section of the airplane
maintenance manual to incorporate certain inspections and compliance
times to detect fatigue cracking of certain principal structural
elements (PSEs). This proposed AD results from new and more restrictive
life limits and inspection intervals for certain PSEs. We are proposing
this AD to ensure that fatigue cracking of various PSEs is detected and
corrected; such fatigue cracking could adversely affect the structural
integrity of these airplanes.
DATES: We must receive comments on this proposed AD by August 10, 2006.
ADDRESSES: Use one of the following addresses to submit comments on
this proposed AD.
DOT Docket Web site: Go to https://dms.dot.gov and follow
the instructions for sending your comments electronically.
Government-wide rulemaking Web site: Go to https://
www.regulations.gov and follow the instructions for sending your
comments electronically.
Mail: Docket Management Facility, U.S. Department of
Transportation, 400 Seventh Street, SW., Nassif Building, Room PL-401,
Washington, DC 20590.
Fax: (202) 493-2251.
Hand Delivery: Room PL-401 on the plaza level of the
Nassif Building, 400 Seventh Street, SW., Washington, DC, between 9
a.m. and 5 p.m., Monday through Friday, except Federal holidays.
Contact Learjet, Inc., One Learjet Way, Wichita, Kansas 67209-2942,
for the service information identified in this proposed AD.
FOR FURTHER INFORMATION CONTACT: Steve Litke, Aerospace Engineer,
Airframe Branch, ACE-118W, FAA, Wichita Aircraft Certification Office,
1801 Airport Road, Room 100, Mid-Continent Airport, Wichita, Kansas
67209; telephone (316) 946-4127; fax (316) 946-4107.
SUPPLEMENTARY INFORMATION:
Comments Invited
We invite you to submit any relevant written data, views, or
arguments regarding this proposed AD. Send your comments to an address
listed in the ADDRESSES section. Include the docket number ``FAA-2006-
25174; Directorate Identifier 2005-NM-007-AD'' at the beginning of your
comments. We specifically invite comments on the overall regulatory,
economic, environmental, and energy aspects of the proposed AD. We will
consider all comments received by the closing date and may amend the
proposed AD in light of those comments.
We will post all comments we receive, without change, to https://
dms.dot.gov, including any personal information you provide. We will
also post a report summarizing each substantive verbal contact with FAA
personnel concerning this proposed AD. Using the search function of
that Web site, anyone can find and read the comments in any of our
dockets, including the name of the individual who sent the comment (or
signed the comment on behalf of an association, business, labor union,
etc.). You may review DOT's complete Privacy Act Statement in the
Federal Register published on April 11, 2000 (65 FR 19477-78), or you
may visit https://dms.dot.gov.
Examining the Docket
You may examine the AD docket on the Internet at https://
dms.dot.gov, or in person at the Docket Management
[[Page 36256]]
Facility office between 9 a.m. and 5 p.m., Monday through Friday,
except Federal holidays. The Docket Management Facility office
(telephone (800) 647-5227) is located on the plaza level of the Nassif
Building at the DOT street address stated in the ADDRESSES section.
Comments will be available in the AD docket shortly after the Docket
Management System receives them.
Discussion
As service experience is accumulated on airplanes or as the result
of post-certification testing and evaluation, it may become necessary
to revise removal limits for removal of certain life-limited components
of the airplane or revise the interval for certain structural
inspections in order to ensure the continued structural integrity of
the airplane. The manufacturer may revise the Airworthiness Limitations
document to include more restrictive life limits or revise repetitive
intervals for certain non-destructive inspection (NDI) techniques and
procedures for each principal structural element (PSE). For the
purposes of this airworthiness directive, a PSE is defined as an
element of structure that contributes significantly to carrying flight,
ground, and pressurization loads. If a failure occurs on any of those
PSEs, it could adversely affect the structural integrity of the
airplane.
The actions specified by the proposed AD are intended to ensure
that fatigue cracking of various PSEs is detected and corrected; such
fatigue cracking could adversely affect the structural integrity of
these airplanes.
New Revisions of Airworthiness Limitations Sections (ALS)
We have reviewed Chapter 4, ``Airworthiness Limitations,'' of the
Learjet 40 Maintenance Manual (MM), Revision 6, dated April 24, 2006;
and Chapter 4, ``Airworthiness Limitations,'' of the Learjet 45 MM,
Revision 38, dated April 24, 2006. These MM chapters add new and more
restrictive life limits and inspection intervals for certain PSEs. PSEs
include, but are not limited to, door cutouts, windshields, skin
sections, bolts, and attachment hardware. The MM chapters explicitly
identify all of the PSEs that are to be inspected in accordance with
the requirements of the Airworthiness Limitations section (ALS).
Accomplishing the actions specified in these chapters is intended to
adequately address the unsafe condition.
FAA's Determination and Requirements of the Proposed AD
We have evaluated all pertinent information and identified an
unsafe condition that is likely to exist or develop on other airplanes
of this same type design. For this reason, we are proposing this AD,
which would require revising the ALS of the MM to incorporate certain
inspections and compliance times to detect fatigue cracking of certain
PSEs.
Clarification of Model Designations
Certain Learjet Model 45 airplanes are also referred to as Model 45
(Learjet 40) airplanes. Model 45 (Learjet 40) airplanes have serial
numbers (S/Ns) 45-2001 through 45-4000 inclusive. The remainder of the
Learjet Model 45 airplanes are referred to as Model 45 (Learjet 45)
airplanes, and have S/Ns 45-002 through 45-2000 inclusive.
Costs of Compliance
There are about 230 airplanes of the affected design in the
worldwide fleet. This proposed AD would affect about 171 airplanes of
U.S. registry. The proposed actions would take about 1 work hour per
airplane, at an average labor rate of $80 per work hour. Based on these
figures, the estimated cost of the proposed AD for U.S. operators is
$13,680, or $80 per airplane.
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.
Regulatory Findings
We have determined that this proposed AD would not have federalism
implications under Executive Order 13132. This proposed AD 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.
For the reasons discussed above, I certify that the 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. 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.
We prepared a regulatory evaluation of the estimated costs to
comply with this proposed AD and placed it in the AD docket. See the
ADDRESSES section for a location to examine the regulatory evaluation.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Safety.
The Proposed Amendment
Accordingly, under the authority delegated to me by the
Administrator, the FAA proposes to amend 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. The Federal Aviation Administration (FAA) amends Sec. 39.13 by
adding the following new airworthiness directive (AD):
Learjet: Docket No. FAA-2006-25174; Directorate Identifier 2005-NM-
007-AD.
Comments Due Date
(a) The FAA must receive comments on this AD action by August
10, 2006.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Learjet Model 45 airplanes, certificated
in any category; serial numbers (S/Ns) 45-002 through 45-233
inclusive, and S/Ns 45-2001 through 45-2031 inclusive.
Unsafe Condition
(d) This AD results from new and more restrictive life limits
and inspection intervals for certain principal structural elements
(PSEs). We are issuing this AD to ensure that fatigue cracking of
various PSEs is detected and corrected; such fatigue cracking could
adversely affect the structural integrity of these airplanes.
[[Page 36257]]
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.
Note 1: This AD requires revisions to certain operator
maintenance documents to include new inspections. Compliance with
these inspections is required by 14 CFR 91.403(c). For airplanes
that have been previously modified, altered, or repaired in the
areas addressed by these inspections, the operator may not be able
to accomplish the inspections described in the revisions. In this
situation, to comply with 14 CFR 91.403(c), the operator must
request approval for an alternative method of compliance (AMOC)
according to paragraph (g) of this AD. The request should include a
description of changes to the required inspections that will ensure
the continued damage tolerance of the affected structure. The FAA
has provided guidance for this determination in Advisory Circular
(AC) 25-1529.
Revise the Airworthiness Limitations Section (ALS)
(f) Within 30 days after the effective date of this AD, revise
the ALS of the airplane maintenance manual (AMM) to include new life
limits and inspection intervals according to a method approved by
the Manager, Wichita Aircraft Certification Office (ACO), FAA.
Incorporating the applicable chapters in paragraph (f)(1) or (f)(2)
of this AD in the AMM is one approved method for doing the revision.
Thereafter, except as provided in paragraph (g) of this AD, no
alternative life limits or inspection intervals may be approved for
the affected PSEs.
(1) For Learjet Model 45 airplanes, S/Ns 45-002 through 45-233
inclusive: Chapter 4 of the Learjet 45 Maintenance Manual, Revision
38, dated April 24, 2006.
(2) For Learjet Model 45 airplanes, S/Ns 45-2001 through 45-2031
inclusive: Chapter 4 of the Learjet 40 Maintenance Manual, Revision
6, dated April 24, 2006.
AMOCs
(g)(1) The Manager, Wichita ACO, 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 Sec.
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 June 14, 2006.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E6-10004 Filed 6-23-06; 8:45 am]
BILLING CODE 4910-13-P
