[Federal Register Volume 75, Number 216 (Tuesday, November 9, 2010)]
[Rules and Regulations]
[Pages 68690-68693]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2010-28174]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2010-0548; Directorate Identifier 2010-NM-041-AD;
Amendment 39-16497; AD 2010-23-08]
RIN 2120-AA64
Airworthiness Directives; Bombardier, Inc. Model BD-700-1A10 and
BD-700-1A11 Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule.
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SUMMARY: We are adopting a new airworthiness directive (AD) for the
products listed above. This AD results from mandatory continuing
airworthiness information (MCAI) originated by an aviation authority of
another country to identify and correct an unsafe condition on an
aviation product. The MCAI describes the unsafe condition as:
Following five reported cases of balance washer screw failure on
similar RATs [ram air turbines]/air driven generators installed on
other aircraft types, an investigation * * * determined that a
specific batch of the screws had a metallographic non-conformity
that increased their susceptibility to brittle fracture. * * *
Failure of a balance washer screw can result in loss of the
related balance washer, with consequent turbine imbalance. Such
imbalance could potentially result in RAT structural failure
(including blade failure), loss of RAT electrical power and
structural damage to the aircraft and, if deployment was activated
by a dual engine shutdown, could also result in loss of hydraulic
power for the flight controls [and consequent reduced ability of the
flightcrew to maintain the safe flight and landing of the airplane].
* * * * *
We are issuing this AD to require actions to correct the unsafe
condition on these products.
DATES: This AD becomes effective December 14, 2010.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in this AD as of December 14,
2010.
ADDRESSES: You may examine the AD docket on the Internet at http://www.regulations.gov or in person at the U.S. Department of
Transportation, Docket Operations, M-30, West Building Ground Floor,
Room W12-140, 1200 New Jersey Avenue, SE., Washington, DC.
FOR FURTHER INFORMATION CONTACT: Christopher Alfano, Aerospace
Engineer, Airframe and Mechanical Systems Branch, ANE-171, FAA, New
York Aircraft Certification Office, 1600 Stewart Avenue, Suite 410,
Westbury, New York 11590; telephone (516) 228-7340; fax (516) 794-5531.
SUPPLEMENTARY INFORMATION:
Discussion
We issued a notice of proposed rulemaking (NPRM) to amend 14 CFR
part 39 to include an AD that would apply to the specified products.
That NPRM was published in the Federal Register on June 4, 2010 (75 FR
31731). That NPRM proposed to correct an unsafe condition for the
specified products. The MCAI states:
Following five reported cases of balance washer screw failure on
similar RATs [ram air turbine]/air driven generators installed on
other aircraft types, an investigation by Hamilton Sundstrand
determined that a specific batch of the screws had a metallographic
non-conformity that increased their susceptibility to brittle
fracture. Subsequently, it was established that 187 RATs [Part
Number (P/N) GL456-1101-7 and Hamilton Sundstrand P/Ns in the 762826
series] had non-conforming screws installed either during production
or possibly during maintenance or repair at Hamilton Sundstrand
repair stations.
Failure of a balance washer screw can result in loss of the
related balance washer, with consequent turbine imbalance. Such
imbalance could potentially result in RAT structural failure
(including blade failure), loss of RAT electrical power and
structural damage to the aircraft and, if deployment was activated
by a dual engine shutdown, could also result in loss of hydraulic
power for the flight controls [and consequent reduced ability of the
flightcrew to maintain the safe flight and landing of the airplane].
This [Canadian] directive mandates checking of the RAT and
replacing the balance washer screws, if required. It also prohibits
future installation of unmodified RATs.
You may obtain further information by examining the MCAI in the AD
docket.
Actions Since NPRM Was Issued
We have determined that this AD should refer to the latest service
information. We have reviewed Bombardier Service Bulletin 700-1A11-24-
014, Revision 02, dated March 15, 2010; and Bombardier Service Bulletin
700-24-075, Revision 02, dated March 15, 2010; which introduce minor
changes, but do not add any additional work. We have revised this final
rule to include the latest version of the applicable Bombardier service
information and to provide credit for work done before the effective
date of this AD, in accordance with the previous revisions of the
service information.
[[Page 68691]]
Comments
We gave the public the opportunity to participate in developing
this AD. We received no comments on the NPRM or on the determination of
the cost to the public.
Conclusion
We reviewed the available data and determined that air safety and
the public interest require adopting the AD with the changes described
previously. We determined that these changes will not increase the
economic burden on any operator or increase the scope of the AD.
Differences Between This AD and the MCAI or Service Information
We have reviewed the MCAI and related service information and, in
general, agree with their substance. But we might have found it
necessary to use different words from those in the MCAI to ensure the
AD is clear for U.S. operators and is enforceable. In making these
changes, we do not intend to differ substantively from the information
provided in the MCAI and related service information.
We might also have required different actions in this AD from those
in the MCAI in order to follow our FAA policies. Any such differences
are highlighted in a NOTE within the AD.
Costs of Compliance
We estimate that this AD will affect 115 products of U.S. registry.
We also estimate that it will take about 1 work-hour per product to
comply with the basic requirements of this AD. The average labor rate
is $85 per work-hour. Based on these figures, we estimate the cost of
this AD to the U.S. operators to be $9,775, or $85 per product.
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 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 this AD:
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 AD and placed it in the AD docket.
Examining the AD Docket
You may examine the AD docket on the Internet at http://www.regulations.gov; or in person at the Docket Operations office
between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The AD docket contains the NPRM, the regulatory evaluation,
any comments received, and other information. The street address for
the Docket Operations office (telephone (800) 647-5527) is in the
ADDRESSES section. Comments will be available in the AD docket shortly
after receipt.
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:
Authority: 49 U.S.C. 106(g), 40113, 44701.
Sec. 39.13 [Amended]
0
2. The FAA amends Sec. 39.13 by adding the following new AD:
2010-23-08 Bombardier, Inc.: Amendment 39-16497. Docket No. FAA-
2010-0548; Directorate Identifier 2010-NM-041-AD.
Effective Date
(a) This airworthiness directive (AD) becomes effective December
14, 2010.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Bombardier, Inc. Model BD-700-1A10 and
BD-700-1A11 airplanes, serial numbers 9002 and subsequent;
certificated in any category.
Subject
(d) Air Transport Association (ATA) of America Code 24:
Electrical power.
Reason
(e) The mandatory continuing airworthiness information (MCAI)
states:
Following five reported cases of balance washer screw failure on
similar RATs [ram air turbines]/air driven generators installed on
other aircraft types, an investigation by Hamilton Sundstrand
determined that a specific batch of the screws had a metallographic
non-conformity that increased their susceptibility to brittle
fracture. Subsequently, it was established that 187 RATs [Part
Number (P/N) GL456-1101-7 and Hamilton Sundstrand P/Ns in the 762826
series] had non-conforming screws installed either during production
or possibly during maintenance or repair at Hamilton Sundstrand
repair stations.
Failure of a balance washer screw can result in loss of the
related balance washer, with consequent turbine imbalance. Such
imbalance could potentially result in RAT structural failure
(including blade failure), loss of RAT electrical power and
structural damage to the aircraft and, if deployment was activated
by a dual engine shutdown, could also result in loss of hydraulic
power for the flight controls [and consequent reduced ability of the
flightcrew to maintain the safe flight and landing of the airplane].
This [Canadian] directive mandates checking of the RAT and
replacing the balance washer screws, if required. It also prohibits
future installation of unmodified RATs.
Compliance
(f) 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
(g) For airplanes having serial numbers 9002 through 9380
inclusive: At the earliest of the times identified in paragraphs
(g)(1), (g)(2), (g)(3) and (g)(4) of this AD, inspect to determine
the serial number of the installed ram air turbine (RAT), in
accordance with the Accomplishment Instructions of the applicable
service bulletin listed in Table 1 of this AD. This inspection may
be conducted visually, which requires lowering the RAT. A review of
airplane maintenance records is acceptable in lieu of this
inspection if the serial number of the RAT can be conclusively
determined from that review.
[[Page 68692]]
(1) Within 500 flight hours or 24 months after the effective
date of this AD, whichever occurs first; or
(2) Prior to the next in-flight or on-ground functional test of
the RAT, whichever occurs first after the effective date of this AD;
or
(3) Prior to the next in-flight or on-ground operational test of
the RAT, whichever occurs first after the effective date of this AD;
or
(4) Prior to the next scheduled RAT in-flight deployment.
(h) If the RAT serial number, as determined in paragraph (g) of
this AD, is not listed in paragraph 1.A of the applicable service
bulletin listed in Table 1 of this AD, no further action is required
by this AD, except as required by paragraph (j) of this AD.
Table 1--Service Bulletins
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Bombardier Service
Model-- Bulletin-- Revision-- Dated--
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BD-700-1A11......................... 700-1A11-24-014........ 02 March 15, 2010.
BD-700-1A10......................... 700-24-075............. 02 March 15, 2010.
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(i) If the RAT serial number, determined in paragraph (g) of
this AD, is listed in paragraph 1.A. of the applicable service
bulletin listed in Table 1 of this AD, before further flight,
inspect to determine if the symbol ``24-7'' is marked on the RAT
identification plate, in accordance with the Accomplishment
Instructions of the applicable service bulletin listed in Table 1 of
this AD. A review of airplane maintenance records is acceptable in
lieu of this inspection if the symbol ``24-7'' mark can be
conclusively determined from that review.
(1) If the symbol ``24-7'' is marked on the RAT identification
plate, the balance washer screws have already been replaced and no
further action is required by this AD, except as required by
paragraph (j) of this AD.
(2) If the symbol ``24-7'' is not marked on the RAT
identification plate, before further flight, replace all balance
washer screws with new balance washer screws, part number MS24667-
14, and mark the RAT identification plate with the symbol ``24-7,''
in accordance with the Accomplishment Instructions of the applicable
service bulletin listed in Table 1 of this AD.
(j) For all airplanes: As of the effective date of this AD, no
person may install on any airplane a replacement or spare RAT (P/N
GL456-1101-7; Hamilton Sundstrand P/Ns in the 762826 series) having
one of the S/Ns listed in paragraph 1.A. of the applicable service
bulletin listed in Table 1 of this AD unless the balance washer
screws have already been replaced and the symbol ``24-7'' is marked
on the RAT identification plate.
Credit for Actions Accomplished in Accordance With Previous Service
Information
(k) Actions accomplished before the effective date of this AD,
in accordance with the applicable service bulletin listed in Table 2
of this AD, are considered acceptable for compliance with the
corresponding action specified in this AD.
Table 2--Credit Service Bulletins
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Bombardier Service
Model-- Bulletin-- Revision-- Dated--
----------------------------------------------------------------------------------------------------------------
BD-700-1A11......................... 700-1A11-24-014........ 01 July 15, 2009.
BD-700-1A10......................... 700-24-075............. 01 July 15, 2009.
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FAA AD Differences
Note 1: This AD differs from the MCAI and/or service information
as follows: Although Canadian Airworthiness Directive CF-2010-01,
dated January 18, 2010, recommends accomplishing the visual
inspection prior to the next scheduled in-flight operational test of
the RAT, we have determined that interval would not address the
identified unsafe condition soon enough to ensure an adequate level
of safety for the affected fleet in light of the degree of urgency
associated with the subject unsafe condition. This difference has
been coordinated with Transport Canada Civil Aviation (TCCA).
Other FAA AD Provisions
(l) The following provisions also apply to this AD:
(1) Alternative Methods of Compliance (AMOCs): The Manager, New
York Aircraft Certification Office (ACO), ANE-170, FAA, has the
authority to approve AMOCs for this AD, if requested using the
procedures found in 14 CFR 39.19. Send information to ATTN: Program
Manager, Continuing Operational Safety, FAA, New York ACO, 1600
Stewart Avenue, Suite 410, Westbury, New York, 11590; telephone 516-
228-7300; fax 516-794-5531. Before using any approved AMOC on any
airplane to which the AMOC applies, notify your principal
maintenance inspector (PMI) or principal avionics inspector (PAI),
as appropriate, or lacking a principal inspector, your local Flight
Standards District Office. The AMOC approval letter must
specifically reference this AD.
(2) Airworthy Product: For any requirement in this AD to obtain
corrective actions from a manufacturer or other source, use these
actions if they are FAA-approved. Corrective actions are considered
FAA-approved if they are approved by the State of Design Authority
(or their delegated agent). You are required to assure the product
is airworthy before it is returned to service.
(3) Reporting Requirements: For any reporting requirement in
this AD, 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 and has assigned
OMB Control Number 2120-0056.
Related Information
(m) Refer to MCAI TCCA Airworthiness Directive CF-2010-01, dated
January 18, 2010; and Bombardier Service Bulletins 700-24-075,
Revision 02, dated March 15, 2010, and 700-1A11-24-014, Revision 02,
dated March 15, 2010; for related information.
Material Incorporated by Reference
(n) You must use Bombardier Service Bulletins 700-24-075,
Revision 02, dated March 15, 2010; or Bombardier Service Bulletin
700-1A11-24-014, Revision 02, dated March 15, 2010; as applicable;
to do the actions required by this AD, unless the AD specifies
otherwise.
(1) The Director of the Federal Register approved the
incorporation by reference of this service information under 5
U.S.C. 552(a) and 1 CFR part 51.
(2) For service information identified in this AD, contact
Bombardier, Inc., 400 C[ocirc]te-Vertu Road West, Dorval,
Qu[eacute]bec H4S 1Y9, Canada; telephone 514-855-5000; fax 514-855-
7401; e-mail [email protected]; Internet http://www.bombardier.com.
(3) You may review copies of the service information at the FAA,
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton,
Washington. For information on the availability of this material at
the FAA, call 425-227-1221.
(4) You may also review copies of the service information that
is incorporated by reference 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: http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html.
[[Page 68693]]
Issued in Renton, Washington on October 21, 2010.
Michael Kaszycki,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 2010-28174 Filed 11-8-10; 8:45 am]
BILLING CODE 4910-13-P