Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) Airplanes, 40224-40226 [E7-13983]
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Federal Register / Vol. 72, No. 141 / Tuesday, July 24, 2007 / Rules and Regulations
March 14, 2006), Section 1, ‘‘Maintenance/
Inspection Tasks.’’ For all tasks identified in
Section 1 of Document 95A.1931/05, the
initial compliance times start from the
effective date of this AD and the repetitive
inspections must be accomplished thereafter
at the intervals specified in Section 1 of
Document 95A.1931/05.
Note 2: Airbus Operator Information Telex
(OIT) SE 999.0076/06, dated June 20, 2006,
identifies the applicable sections of the
Airbus A318/A319/A320/A321 Airplane
Maintenance Manual necessary for
accomplishing the tasks specified in Section
1 of Document 95A.1931/05.
FAA, Transport Airplane Directorate, 1601
Lind Avenue, SW., Renton, Washington; or at
the National Archives and Records
Administration (NARA). For information on
the availability of this material at NARA, call
202–741–6030, or go to: https://
www.archives.gov/federal-register/cfr/ibrlocations.html.
Revise ALS To Incorporate CDCCLs
(g) Within 12 months after the effective
date of this AD, revise the ALS of the
Instructions for Continued Airworthiness to
incorporate Airbus A318/A319/A320/A321
ALS Part 5—Fuel Airworthiness Limitations,
dated February 28, 2006, as defined in Airbus
A318/A319/A320/A321 Fuel Airworthiness
Limitations, Document 95A.1931/05, Issue 1,
dated December 19, 2005 (approved by the
EASA on March 14, 2006), Section 2,
‘‘Critical Design Configuration Control
Limitations.’’
BILLING CODE 4910–13–P
No Alternative Inspections, Inspection
Intervals, or CDCCLs
(h) Except as provided by paragraph (i) of
this AD: After accomplishing the actions
specified in paragraphs (f) and (g) of this AD,
no alternative inspections, inspection
intervals, or CDCCLs may be used.
Alternative Methods of Compliance
(AMOCs)
(i)(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) To request a different method of
compliance or a different compliance time
for this AD, follow the procedures in 14 CFR
39.19. Before using any approved AMOC on
any airplane to which the AMOC applies,
notify your appropriate principal inspector
(PI) in the FAA Flight Standards District
Office (FSDO), or lacking a PI, your local
FSDO.
pwalker on PROD1PC71 with RULES
Related Information
(j) EASA airworthiness directive 2006–
0203, dated July 11, 2006, also addresses the
subject of this AD.
Material Incorporated by Reference
(k) You must use Airbus A318/A319/A320/
A321 Fuel Airworthiness Limitations,
Document 95A.1931/05, Issue 1, dated
December 19, 2005; and Airbus A318/A319/
A320/A321 ALS Part 5—Fuel Airworthiness
Limitations, dated February 28, 2006; to
perform the actions that are required by this
AD, unless the AD specifies otherwise. The
Director of the Federal Register approves the
incorporation by reference of these
documents in accordance with 5 U.S.C.
552(a) and 1 CFR part 51. Contact Airbus, 1
Rond Point Maurice Bellonte, 31707 Blagnac
Cedex, France, for a copy of this service
information. You may review copies at the
VerDate Aug<31>2005
17:17 Jul 23, 2007
Jkt 211001
Issued in Renton, Washington, on July 13,
2007.
Stephen P. Boyd,
Acting Manager, Transport Airplane
Directorate, Aircraft Certification Service.
[FR Doc. E7–14044 Filed 7–23–07; 8:45 am]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2006–25779; Directorate
Identifier 2006–NM–088–AD; Amendment
39–15131; AD 2007–15–02]
RIN 2120–AA64
Airworthiness Directives; Bombardier
Model CL–600–2B19 (Regional Jet
Series 100 & 440) Airplanes
Federal Aviation
Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule.
AGENCY:
SUMMARY: The FAA is adopting a new
airworthiness directive (AD) for all
Bombardier Model CL–600–2B19
(Regional Jet Series 100 & 440)
airplanes. This AD requires revising the
Certification Maintenance Requirements
and the Maintenance Review Board
Report sections of the Canadair Regional
Jet Maintenance Requirements Manual
to include changes and additions to
checks of the aileron power control
units (PCUs) and a change to the
interval of the backlash check of the
aileron control system. This AD results
from a report that data collected from
in-service airplanes show that
approximately 19 percent of aileron
backlash checks conducted at 4,000flight-hour intervals reveal that aileron
backlash wear limits are being
exceeded. We are issuing this AD to
prevent exceeded backlashes in both
aileron PCUs, which, if accompanied by
the failure of the flutter damper, could
result in aileron vibration/flutter and
reduced controllability of the airplane.
DATES: This AD becomes effective
August 28, 2007.
The Director of the Federal Register
approved the incorporation by reference
of certain publications listed in the AD
as of August 28, 2007.
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You may examine the AD
docket on the Internet at https://
dms.dot.gov or in person at the U.S.
Department of Transportation, Docket
Operations, M–30, West Building
Ground Floor, Room W12–40, 1200 New
Jersey Avenue, SE., Washington, DC.
Contact Bombardier, Inc., Canadair,
Aerospace Group, P.O. Box 6087,
Station Centreville, Montreal, Quebec
H3C 3G9, Canada, for service
information identified in this AD.
FOR FURTHER INFORMATION CONTACT:
Daniel Parrillo, Aerospace Engineer,
Systems and Flight Test Branch, ANE–
172, FAA, New York Aircraft
Certification Office, 1600 Stewart
Avenue, Suite 410, Westbury, New York
11590; telephone (516) 228–7305; fax
(516) 794–5531.
SUPPLEMENTARY INFORMATION:
ADDRESSES:
Examining the Docket
You may examine the airworthiness
directive (AD) docket on the Internet at
https://dms.dot.gov or in person at the
Docket Operations office between 9 a.m.
and 5 p.m., Monday through Friday,
except Federal holidays. The Docket
Operations office (telephone (800) 647–
5527) is located on the ground floor of
the West Building at the street address
stated in the ADDRESSES section.
Discussion
The FAA issued a notice of proposed
rulemaking (NPRM) to amend 14 CFR
part 39 to include an AD that would
apply to all Bombardier Model CL–600–
2B19 (Regional Jet Series 100 & 440)
airplanes. That NPRM was published in
the Federal Register on September 11,
2006 (71 FR 53345). That NPRM
proposed to require revising the
Certification Maintenance Requirements
and the Maintenance Review Board
(MRB) Report sections of the Canadair
Regional Jet Maintenance Requirements
Manual (MRM) to include changes and
additions to checks of the aileron power
control units (PCUs) and a change to the
interval of the backlash check of the
aileron control system.
Comments
We provided the public the
opportunity to participate in the
development of this AD. We have
considered the comments received.
Request To Provide Additional
Information on Selection of Check
Interval
The National Transportation Safety
Board (NTSB) requests that we provide
additional information in the final rule
indicating how the repeat interval for
the aileron backlash check was selected
and why the interval will prevent flight
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Federal Register / Vol. 72, No. 141 / Tuesday, July 24, 2007 / Rules and Regulations
pwalker on PROD1PC71 with RULES
with aileron freeplay greater than the
maximum limit. The NTSB notes that
the Discussion section of the proposed
AD does not explain how the 2,000flight-hour interval was selected or why
it would prevent flight with aileron
freeplay greater than the maximum
limit.
We agree to provide additional
information. The repeat interval was
selected after consideration of several
factors related to known service
experience, guidance from flutter
analysis reference materials, and
detailed flutter analysis. With respect to
service experience, the absence of
reports of buzzing or flutter events,
known values of backlash freeplay, and
the existing inspection interval were
evaluated. Known backlash freeplay
values were assessed against those
recommended in flutter reference
materials. A review of a recent flutter
analysis conducted by Bombardier was
also included in our consideration of an
appropriate interval.
Also, Bombardier, with the agreement
of the airworthiness authorities
(Transport Canada Civil Aviation
(TCCA) and the FAA), has started
monthly monitoring of the Model
CRJ200 fleet since the inspection
interval was lowered from 4,000 to
2,000 flight hours. After collecting
sufficient data on the backlash freeplay
that develops during the 2,000-flighthour interval, further evaluation of the
interval may be conducted.
Therefore, we consider the proposed
interval to be appropriate at this time.
No change to the AD is necessary in this
regard.
Request To Collect Aileron Freeplay
Data
The NTSB also requests that the FAA
revise the AD to include a method for
operators to record, retain, and report
aileron freeplay check data. The NTSB
is concerned that the FAA, TCCA, and
Bombardier might fail to monitor the
effects of the reduced interval
appropriately by not collecting and
analyzing aileron freeplay check data.
We do not agree to revise the AD to
add a requirement to collect and report
data. While we have not mandated
reporting of the aileron freeplay check
measurements to the manufacturer, Task
Card 000–27–900–015 specifies
recording and retaining this
measurement. Bombardier is soliciting
the measurement results from operators
during the bi-monthly Technical
Steering Committee meetings. As of
January 2007, Bombardier has received
feedback on over 70 airplanes and is
confident that sufficient data will be
available at the end of the 2-year term
VerDate Aug<31>2005
17:17 Jul 23, 2007
Jkt 211001
to provide validation of the check
interval. TCCA requires Bombardier to
provide the data results within 2 years
after issuing Temporary Revision 1–2–
33 to the MRM. Bombardier will
tabulate the results based on the current
methods and provide a matrix along
with a recommendation to TCCA in
mid-2008. There is no need to mandate
a method for collecting the data, as there
is a process in place. No change to the
AD is necessary in this regard.
Request To Use Data in Monitoring
Reclassification of Aileron Freeplay
Check
The NTSB suggests that aileron
freeplay data provided by the operators
also be used to assist the FAA, TCCA,
and Bombardier in monitoring the
reclassification of the bearing backlash
test portion of the aileron freeplay
check. The NTSB states that the NPRM
proposes to reclassify the bearing
backlash test portion of the aileron
freeplay check from a certification
maintenance requirement (CMR) task to
an MRB task. The aileron freeplay
backlash check would be replaced with
an aileron PCU internal leakage test and
would remain a CMR task.
We agree that the aileron free play
data could be useful. We will consider
the NTSB’s suggestion to use aileron
freeplay data to monitor reclassification
of the bearing backlash test once the
service data are collected and we have
reviewed the data. No change to the AD
is necessary in this regard.
Clarification of Alternative Method of
Compliance (AMOC) Paragraph
We have revised this action to clarify
the appropriate procedure for notifying
the principal inspector before using any
approved AMOC on any airplane to
which the AMOC applies.
Conclusion
We have carefully reviewed the
available data, including the comments
received, and determined that air safety
and the public interest require adopting
the AD with the change described
previously. We have determined that
this change will neither increase the
economic burden on any operator nor
increase the scope of the AD.
Costs of Compliance
This AD affects about 742 airplanes of
U.S. registry. The required actions 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 AD for U.S. operators is
$59,360, or $80 per airplane.
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40225
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 AD will
not have federalism implications under
Executive Order 13132. This AD will
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 this AD:
(1) Is not a ‘‘significant regulatory
action’’ under Executive Order 12866;
(2) Is not a ‘‘significant rule’’ under
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 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, Incorporation by reference,
Safety.
Adoption of the Amendment
Accordingly, under the authority
delegated to me by the Administrator,
the FAA amends 14 CFR part 39 as
follows:
I
PART 39—AIRWORTHINESS
DIRECTIVES
1. The authority citation for part 39
continues to read as follows:
I
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40226
Federal Register / Vol. 72, No. 141 / Tuesday, July 24, 2007 / Rules and Regulations
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):
I
2007–15–02 Bombardier, Inc. (Formerly
Canadair): Amendment 39–15131.
Docket No. FAA–2006–25779;
Directorate Identifier 2006–NM–088–AD.
Effective Date
(a) This AD becomes effective August 28,
2007.
Affected ADs
(b) None.
Applicability
(c) This AD applies to all Bombardier
Model CL–600–2B19 (Regional Jet Series 100
& 440) airplanes, certificated in any category.
Unsafe Condition
(d) This AD results from a report that data
collected from in-service airplanes show that
approximately 19 percent of aileron backlash
checks conducted at 4,000-flight-hour
intervals reveal that aileron backlash wear
limits are being exceeded. We are issuing this
AD to prevent exceeded backlashes in both
aileron power control units (PCUs), which, if
accompanied by the failure of the flutter
damper, could result in aileron vibration/
flutter and reduced controllability of the
airplane.
pwalker on PROD1PC71 with RULES
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.
Revision of the Maintenance Requirements
Manual (MRM)
(f) Within 60 days after the effective date
of this AD, revise the Canadair Regional Jet
MRM CSP A–053 by doing the actions
specified in paragraphs (f)(1) and (f)(2) of this
AD. When the tasks specified in Canadair
Regional Jet Temporary Revisions 2A–20,
dated March 13, 2006; and 1–2–33, dated
October 27, 2005; are included in the general
revisions of the MRM, the general revisions
may be inserted in the MRM, and these
temporary revisions may be removed.
(1) Revise the Certification Maintenance
Requirements section of the Canadair
Regional Jet MRM to include Tasks C27–10–
105–06 and C27–10–105–05, as specified in
Canadair Regional Jet Temporary Revision
2A–20, dated March 13, 2006, to Part 2,
Appendix A—Certification Maintenance
Requirements, of the Canadair Regional Jet
MRM CSP A–053.
(2) Revise the Maintenance Review Board
Report for Section 2—Systems and
Powerplant Program, of Part 1 of the
Canadair Regional Jet MRM CSP A–053, to
include the task interval for Task 27–11–00–
09, as specified in Canadair Regional Jet
Temporary Revision 1–2–33, dated October
27, 2005. Incorporating Revision 10, dated
May 27, 2005, of the Canadair Regional Jet
Maintenance Review Board Report for
VerDate Aug<31>2005
17:17 Jul 23, 2007
Jkt 211001
Section 2—Systems and Powerplant Program
of the Canadair Regional Jet MRM CSP A–053
is one approved method for including the
task interval specified in Canadair Regional
Jet Temporary Revision 1–2–33. After the
task interval has been incorporated into the
MRM, no alternative aileron backlash check
interval in excess of 2,000 flight hours may
be approved, except as specified in
paragraphs (g) and (h) of this AD.
Phase-In Schedule for Initial Inspection
Specified in MRM Revisions
(g) For airplanes with more than 1,000
flight hours but less than 3,000 flight hours
since the last aileron backlash check
specified in Task 27–11–00–09 was
accomplished, as of the effective date of this
AD: Within 1,000 flight hours after the
effective date of this AD, do the next aileron
backlash check in accordance with Task 27–
11–00–09, as specified in Canadair Regional
Jet Temporary Revision 1–2–33, dated
October 27, 2005.
(h) For airplanes with 3,000 flight hours or
more since the last aileron backlash check
specified in Task 27–11–00–09 was
accomplished, as of the effective date of this
AD: Within 4,000 flight hours after the last
aileron backlash check, do the next aileron
backlash check in accordance with Task 27–
11–00–09, as specified in Canadair Regional
Jet Temporary Revision 1–2–33, dated
October 27, 2005.
One Approved Method for Task C27–10–
105–06
(i) For airplanes without access to ground
support equipment necessary to do the PCU
internal leakage functional check, as
specified in Task C27–10–105–06 specified
in paragraph (f)(1) of this AD: Doing the
aileron PCU internal leakage check in
accordance with Task 27–11–00–220–803 of
Chapter 27–11–00 of the Canadair Regional
Jet Aircraft Maintenance Manual at intervals
not to exceed 4,000 flight hours is one
approved method for accomplishing Task
C27–10–105–06, and is acceptable for up to
12 months after the effective date of this AD.
Thereafter, the check must be done in
accordance with Task C27–10–105–06 as
specified in paragraph (f)(1) of this AD at a
repetitive interval not to exceed that
specified in the task.
Alternative Methods of Compliance
(AMOCs)
(j)(1) The Manager, New York Aircraft
Certification Office, FAA, has the authority to
approve AMOCs for this AD, if requested in
accordance with the procedures found in 14
CFR 39.19.
(2) To request a different method of
compliance or a different compliance time
for this AD, follow the procedures in 14 CFR
39.19. Before using any approved AMOC on
any airplane to which the AMOC applies,
notify your appropriate principal inspector
(PI) in the FAA Flight Standards District
Office (FSDO), or lacking a PI, your local
FSDO.
Related Information
(k) Canadian airworthiness directive CF–
2006–04, dated March 22, 2006, also
addresses the subject of this AD.
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Material Incorporated by Reference
(l) You must use Canadair Regional Jet
Temporary Revision 1–2–33, dated October
27, 2005, to the Canadair Regional Jet
Maintenance Review Manual CSP A–053;
and Canadair Regional Jet Temporary
Revision 2A–20, dated March 13, 2006, to the
Canadair Regional Jet Maintenance Review
Manual CSP A–053; to perform the actions
that are required by this AD, unless the AD
specifies otherwise. The Director of the
Federal Register approved the incorporation
by reference of these documents in
accordance with 5 U.S.C. 552(a) and 1 CFR
part 51. Contact Bombardier, Inc., Canadair,
Aerospace Group, P.O. Box 6087, Station
Centre-ville, Montreal, Quebec H3C 3G9,
Canada, for a copy of this service
information. You may review copies at the
FAA, Transport Airplane Directorate, 1601
Lind Avenue, SW., Renton, Washington; or at
the National Archives and Records
Administration (NARA). For information on
the availability of this material at NARA, call
202–741–6030, or go to: https://
www.archives.gov/federal-register/cfr/ibrlocations.html.
Issued in Renton, Washington, on July 11,
2007.
Stephen P. Boyd,
Acting Manager, Transport Airplane
Directorate, Aircraft Certification Service.
[FR Doc. E7–13983 Filed 7–23–07; 8:45 am]
BILLING CODE 4910–13–P
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA–2007–28750; Directorate
Identifier 2007–NM–124–AD; Amendment
39–15133; AD 2007–15–04]
RIN 2120–AA64
Airworthiness Directives; Boeing
Model 737–800 Series Airplanes
Federal Aviation
Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule; request for
comments.
AGENCY:
SUMMARY: The FAA is superseding an
existing airworthiness directive (AD)
that applies to certain Boeing Model
737–800 series airplanes. The existing
AD currently requires inspecting flight
spoilers to determine spoiler position
after every landing and after any
rejected takeoff maneuver. For airplanes
on which any flight spoiler is found in
the up position with the speedbrake
handle in the down position, the
existing AD requires replacing the flight
spoiler actuator with a flight spoiler
actuator having a certain part number.
The existing AD also requires an
operational test of the speedbrake
E:\FR\FM\24JYR1.SGM
24JYR1
]]>Agencies
[Federal Register Volume 72, Number 141 (Tuesday, July 24, 2007)]
[Rules and Regulations]
[Pages 40224-40226]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: E7-13983]
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2006-25779; Directorate Identifier 2006-NM-088-AD;
Amendment 39-15131; AD 2007-15-02]
RIN 2120-AA64
Airworthiness Directives; Bombardier Model CL-600-2B19 (Regional
Jet Series 100 & 440) Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule.
-----------------------------------------------------------------------
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for all
Bombardier Model CL-600-2B19 (Regional Jet Series 100 & 440) airplanes.
This AD requires revising the Certification Maintenance Requirements
and the Maintenance Review Board Report sections of the Canadair
Regional Jet Maintenance Requirements Manual to include changes and
additions to checks of the aileron power control units (PCUs) and a
change to the interval of the backlash check of the aileron control
system. This AD results from a report that data collected from in-
service airplanes show that approximately 19 percent of aileron
backlash checks conducted at 4,000-flight-hour intervals reveal that
aileron backlash wear limits are being exceeded. We are issuing this AD
to prevent exceeded backlashes in both aileron PCUs, which, if
accompanied by the failure of the flutter damper, could result in
aileron vibration/flutter and reduced controllability of the airplane.
DATES: This AD becomes effective August 28, 2007.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in the AD as of August 28,
2007.
ADDRESSES: You may examine the AD docket on the Internet at https://
dms.dot.gov or in person at the U.S. Department of Transportation,
Docket Operations, M-30, West Building Ground Floor, Room W12-40, 1200
New Jersey Avenue, SE., Washington, DC.
Contact Bombardier, Inc., Canadair, Aerospace Group, P.O. Box 6087,
Station Centreville, Montreal, Quebec H3C 3G9, Canada, for service
information identified in this AD.
FOR FURTHER INFORMATION CONTACT: Daniel Parrillo, Aerospace Engineer,
Systems and Flight Test Branch, ANE-172, FAA, New York Aircraft
Certification Office, 1600 Stewart Avenue, Suite 410, Westbury, New
York 11590; telephone (516) 228-7305; fax (516) 794-5531.
SUPPLEMENTARY INFORMATION:
Examining the Docket
You may examine the airworthiness directive (AD) docket on the
Internet at https://dms.dot.gov or in person at the Docket Operations
office between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The Docket Operations office (telephone (800) 647-5527) is
located on the ground floor of the West Building at the street address
stated in the ADDRESSES section.
Discussion
The FAA issued a notice of proposed rulemaking (NPRM) to amend 14
CFR part 39 to include an AD that would apply to all Bombardier Model
CL-600-2B19 (Regional Jet Series 100 & 440) airplanes. That NPRM was
published in the Federal Register on September 11, 2006 (71 FR 53345).
That NPRM proposed to require revising the Certification Maintenance
Requirements and the Maintenance Review Board (MRB) Report sections of
the Canadair Regional Jet Maintenance Requirements Manual (MRM) to
include changes and additions to checks of the aileron power control
units (PCUs) and a change to the interval of the backlash check of the
aileron control system.
Comments
We provided the public the opportunity to participate in the
development of this AD. We have considered the comments received.
Request To Provide Additional Information on Selection of Check
Interval
The National Transportation Safety Board (NTSB) requests that we
provide additional information in the final rule indicating how the
repeat interval for the aileron backlash check was selected and why the
interval will prevent flight
[[Page 40225]]
with aileron freeplay greater than the maximum limit. The NTSB notes
that the Discussion section of the proposed AD does not explain how the
2,000-flight-hour interval was selected or why it would prevent flight
with aileron freeplay greater than the maximum limit.
We agree to provide additional information. The repeat interval was
selected after consideration of several factors related to known
service experience, guidance from flutter analysis reference materials,
and detailed flutter analysis. With respect to service experience, the
absence of reports of buzzing or flutter events, known values of
backlash freeplay, and the existing inspection interval were evaluated.
Known backlash freeplay values were assessed against those recommended
in flutter reference materials. A review of a recent flutter analysis
conducted by Bombardier was also included in our consideration of an
appropriate interval.
Also, Bombardier, with the agreement of the airworthiness
authorities (Transport Canada Civil Aviation (TCCA) and the FAA), has
started monthly monitoring of the Model CRJ200 fleet since the
inspection interval was lowered from 4,000 to 2,000 flight hours. After
collecting sufficient data on the backlash freeplay that develops
during the 2,000-flight-hour interval, further evaluation of the
interval may be conducted.
Therefore, we consider the proposed interval to be appropriate at
this time. No change to the AD is necessary in this regard.
Request To Collect Aileron Freeplay Data
The NTSB also requests that the FAA revise the AD to include a
method for operators to record, retain, and report aileron freeplay
check data. The NTSB is concerned that the FAA, TCCA, and Bombardier
might fail to monitor the effects of the reduced interval appropriately
by not collecting and analyzing aileron freeplay check data.
We do not agree to revise the AD to add a requirement to collect
and report data. While we have not mandated reporting of the aileron
freeplay check measurements to the manufacturer, Task Card 000-27-900-
015 specifies recording and retaining this measurement. Bombardier is
soliciting the measurement results from operators during the bi-monthly
Technical Steering Committee meetings. As of January 2007, Bombardier
has received feedback on over 70 airplanes and is confident that
sufficient data will be available at the end of the 2-year term to
provide validation of the check interval. TCCA requires Bombardier to
provide the data results within 2 years after issuing Temporary
Revision 1-2-33 to the MRM. Bombardier will tabulate the results based
on the current methods and provide a matrix along with a recommendation
to TCCA in mid-2008. There is no need to mandate a method for
collecting the data, as there is a process in place. No change to the
AD is necessary in this regard.
Request To Use Data in Monitoring Reclassification of Aileron Freeplay
Check
The NTSB suggests that aileron freeplay data provided by the
operators also be used to assist the FAA, TCCA, and Bombardier in
monitoring the reclassification of the bearing backlash test portion of
the aileron freeplay check. The NTSB states that the NPRM proposes to
reclassify the bearing backlash test portion of the aileron freeplay
check from a certification maintenance requirement (CMR) task to an MRB
task. The aileron freeplay backlash check would be replaced with an
aileron PCU internal leakage test and would remain a CMR task.
We agree that the aileron free play data could be useful. We will
consider the NTSB's suggestion to use aileron freeplay data to monitor
reclassification of the bearing backlash test once the service data are
collected and we have reviewed the data. No change to the AD is
necessary in this regard.
Clarification of Alternative Method of Compliance (AMOC) Paragraph
We have revised this action to clarify the appropriate procedure
for notifying the principal inspector before using any approved AMOC on
any airplane to which the AMOC applies.
Conclusion
We have carefully reviewed the available data, including the
comments received, and determined that air safety and the public
interest require adopting the AD with the change described previously.
We have determined that this change will neither increase the economic
burden on any operator nor increase the scope of the AD.
Costs of Compliance
This AD affects about 742 airplanes of U.S. registry. The required
actions 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
AD for U.S. operators is $59,360, 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 AD will not have federalism
implications under Executive Order 13132. This AD will 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 this AD:
(1) Is not a ``significant regulatory action'' under Executive
Order 12866;
(2) Is not a ``significant rule'' under 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 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, Incorporation by
reference, Safety.
Adoption of the Amendment
0
Accordingly, under the authority delegated to me by the Administrator,
the FAA amends 14 CFR part 39 as follows:
PART 39--AIRWORTHINESS DIRECTIVES
0
1. The authority citation for part 39 continues to read as follows:
[[Page 40226]]
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
0
2. The Federal Aviation Administration (FAA) amends Sec. 39.13 by
adding the following new airworthiness directive (AD):
2007-15-02 Bombardier, Inc. (Formerly Canadair): Amendment 39-15131.
Docket No. FAA-2006-25779; Directorate Identifier 2006-NM-088-AD.
Effective Date
(a) This AD becomes effective August 28, 2007.
Affected ADs
(b) None.
Applicability
(c) This AD applies to all Bombardier Model CL-600-2B19
(Regional Jet Series 100 & 440) airplanes, certificated in any
category.
Unsafe Condition
(d) This AD results from a report that data collected from in-
service airplanes show that approximately 19 percent of aileron
backlash checks conducted at 4,000-flight-hour intervals reveal that
aileron backlash wear limits are being exceeded. We are issuing this
AD to prevent exceeded backlashes in both aileron power control
units (PCUs), which, if accompanied by the failure of the flutter
damper, could result in aileron vibration/flutter and reduced
controllability of the airplane.
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.
Revision of the Maintenance Requirements Manual (MRM)
(f) Within 60 days after the effective date of this AD, revise
the Canadair Regional Jet MRM CSP A-053 by doing the actions
specified in paragraphs (f)(1) and (f)(2) of this AD. When the tasks
specified in Canadair Regional Jet Temporary Revisions 2A-20, dated
March 13, 2006; and 1-2-33, dated October 27, 2005; are included in
the general revisions of the MRM, the general revisions may be
inserted in the MRM, and these temporary revisions may be removed.
(1) Revise the Certification Maintenance Requirements section of
the Canadair Regional Jet MRM to include Tasks C27-10-105-06 and
C27-10-105-05, as specified in Canadair Regional Jet Temporary
Revision 2A-20, dated March 13, 2006, to Part 2, Appendix A--
Certification Maintenance Requirements, of the Canadair Regional Jet
MRM CSP A-053.
(2) Revise the Maintenance Review Board Report for Section 2--
Systems and Powerplant Program, of Part 1 of the Canadair Regional
Jet MRM CSP A-053, to include the task interval for Task 27-11-00-
09, as specified in Canadair Regional Jet Temporary Revision 1-2-33,
dated October 27, 2005. Incorporating Revision 10, dated May 27,
2005, of the Canadair Regional Jet Maintenance Review Board Report
for Section 2--Systems and Powerplant Program of the Canadair
Regional Jet MRM CSP A-053 is one approved method for including the
task interval specified in Canadair Regional Jet Temporary Revision
1-2-33. After the task interval has been incorporated into the MRM,
no alternative aileron backlash check interval in excess of 2,000
flight hours may be approved, except as specified in paragraphs (g)
and (h) of this AD.
Phase-In Schedule for Initial Inspection Specified in MRM Revisions
(g) For airplanes with more than 1,000 flight hours but less
than 3,000 flight hours since the last aileron backlash check
specified in Task 27-11-00-09 was accomplished, as of the effective
date of this AD: Within 1,000 flight hours after the effective date
of this AD, do the next aileron backlash check in accordance with
Task 27-11-00-09, as specified in Canadair Regional Jet Temporary
Revision 1-2-33, dated October 27, 2005.
(h) For airplanes with 3,000 flight hours or more since the last
aileron backlash check specified in Task 27-11-00-09 was
accomplished, as of the effective date of this AD: Within 4,000
flight hours after the last aileron backlash check, do the next
aileron backlash check in accordance with Task 27-11-00-09, as
specified in Canadair Regional Jet Temporary Revision 1-2-33, dated
October 27, 2005.
One Approved Method for Task C27-10-105-06
(i) For airplanes without access to ground support equipment
necessary to do the PCU internal leakage functional check, as
specified in Task C27-10-105-06 specified in paragraph (f)(1) of
this AD: Doing the aileron PCU internal leakage check in accordance
with Task 27-11-00-220-803 of Chapter 27-11-00 of the Canadair
Regional Jet Aircraft Maintenance Manual at intervals not to exceed
4,000 flight hours is one approved method for accomplishing Task
C27-10-105-06, and is acceptable for up to 12 months after the
effective date of this AD. Thereafter, the check must be done in
accordance with Task C27-10-105-06 as specified in paragraph (f)(1)
of this AD at a repetitive interval not to exceed that specified in
the task.
Alternative Methods of Compliance (AMOCs)
(j)(1) The Manager, New York Aircraft Certification Office, FAA,
has the authority to approve AMOCs for this AD, if requested in
accordance with the procedures found in 14 CFR 39.19.
(2) To request a different method of compliance or a different
compliance time for this AD, follow the procedures in 14 CFR 39.19.
Before using any approved AMOC on any airplane to which the AMOC
applies, notify your appropriate principal inspector (PI) in the FAA
Flight Standards District Office (FSDO), or lacking a PI, your local
FSDO.
Related Information
(k) Canadian airworthiness directive CF-2006-04, dated March 22,
2006, also addresses the subject of this AD.
Material Incorporated by Reference
(l) You must use Canadair Regional Jet Temporary Revision 1-2-
33, dated October 27, 2005, to the Canadair Regional Jet Maintenance
Review Manual CSP A-053; and Canadair Regional Jet Temporary
Revision 2A-20, dated March 13, 2006, to the Canadair Regional Jet
Maintenance Review Manual CSP A-053; to perform the actions that are
required by this AD, unless the AD specifies otherwise. The Director
of the Federal Register approved the incorporation by reference of
these documents in accordance with 5 U.S.C. 552(a) and 1 CFR part
51. Contact Bombardier, Inc., Canadair, Aerospace Group, P.O. Box
6087, Station Centre-ville, Montreal, Quebec H3C 3G9, Canada, for a
copy of this service information. You may review copies at the FAA,
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton,
Washington; or at the National Archives and Records Administration
(NARA). For information on the availability of this material at
NARA, call 202-741-6030, or go to: https://www.archives.gov/federal-
register/cfr/ibr-locations.html.
Issued in Renton, Washington, on July 11, 2007.
Stephen P. Boyd,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. E7-13983 Filed 7-23-07; 8:45 am]
BILLING CODE 4910-13-P
