
[Federal Register Volume 77, Number 200 (Tuesday, October 16, 2012)]
[Rules and Regulations]
[Pages 63215-63217]
From the Federal Register Online via the Government Printing Office [www.gpo.gov]
[FR Doc No: 2012-25109]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2012-0724; Directorate Identifier 2012-NM-043-AD; 
Amendment 39-17215; AD 2012-20-09]
RIN 2120-AA64


Airworthiness Directives; Bombardier, Inc. Airplanes

AGENCY: Federal Aviation Administration (FAA), Department of 
Transportation (DOT).

ACTION: Final rule.

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SUMMARY: We are superseding an existing airworthiness directive (AD) 
for certain Bombardier, Inc. Model DHC-8-400 series airplanes. That AD 
currently requires a modification to trim the edge of the bumper plate, 
including performing an inspection for damage or cracks of the bumper 
plate and base fitting, and replacing any damaged or cracked part. That 
AD also currently requires, for certain airplanes, reidentifying the 
bumper plate. This new AD requires, for airplanes on which the 
reidentification is done, an operational check of the alternate 
extension system of the main landing gear (MLG), and repair if 
necessary. This AD was prompted by the determination that an 
operational check must be done after reidentifying the bumper plate to 
ensure the identified unsafe condition is addressed. We are issuing 
this AD to detect and correct failure of the MLG to extend and lock, 
which could adversely affect the safe landing of the airplane.

DATES: This AD becomes effective November 20, 2012.
    The Director of the Federal Register approved the incorporation by 
reference of a certain publication listed in this AD as of September 
19, 2011 (76 FR 50403, August 15, 2011).

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: Cesar Gomez, Aerospace Engineer, 
Airframe and Mechanical Systems Branch, ANE-171, FAA, New York Aircraft 
Certification Office (ACO), 1600 Stewart Avenue, Suite 410, Westbury, 
New York 11590; telephone (516) 228-7318; fax (516) 794-5531.

SUPPLEMENTARY INFORMATION:

[[Page 63216]]

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 July 25, 2012 (77 FR 
43545), and proposed to supersede AD 2011-17-04, Amendment 39-16768 (76 
FR 50403, August 15, 2011). That NPRM proposed to correct an unsafe 
condition for the specified products. The Mandatory Continuing 
Airworthiness Information (MCAI) states:

    One in-service incident has been reported on [a] DHC-8 Series 
400 aeroplane in which the right hand main landing gear (MLG) failed 
to extend using the alternate gear extension system. Investigation 
determined that the tread on the outboard tire was catching on the 
bumper plate located on the outboard MLG door that prevented the MLG 
door to open following an extension attempt via the alternate 
extension system. Failure of [the] MLG to extend and lock could 
adversely affect the safe landing of the aeroplane.
    To prevent the potential jam condition between the bumper plate 
and the MLG tires, Bombardier Aerospace has developed a modification 
to trim the edge of the bumper plate to eliminate the possibility of 
interference [Bombardier Modsum 4-113645].

The Modsum includes performing a detailed visual inspection for damage 
or cracks of the bumper plate and base fitting, and replacing any 
damaged or cracked part with a new part, if necessary. You may obtain 
further information by examining the MCAI in the AD docket.

Comments

    We gave the public the opportunity to participate in developing 
this AD. We received no comments on the NPRM (77 FR 43545, July 25, 
2012) 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 as proposed.

Costs of Compliance

    Based on the service information, we estimate that this AD affects 
about 65 products of U.S. registry.
    The actions that are required by AD 2011-17-04, Amendment 39-16768 
(76 FR 50403, August 15, 2011), and retained in this AD take about 8 
work-hours per product, at an average labor rate of $85 per work hour. 
Required parts would cost about $479 per product. Where the service 
information lists required parts costs that are covered under warranty, 
we have assumed that there will be no charge for these costs. As we do 
not control warranty coverage for affected parties, some parties may 
incur costs higher than estimated here. Based on these figures, the 
cost of the currently required actions is $1,159 per product.
    We estimate that it takes about 1 work-hour per product to comply 
with the new basic requirements of this AD. The average labor rate is 
$85 per work-hour. Based on these figures, we estimate the cost of the 
AD on U.S. operators to be $5,525, or $85 per product.
    We have received no definitive data that would enable us to provide 
a cost estimate for the on-condition actions specified in this AD.

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 that 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);
    3. Will not affect intrastate aviation in Alaska; and
    4. 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 (77 FR 43545, July 25, 2012), 
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

    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 removing airworthiness directive (AD) 
2011-17-04, Amendment 39-16768 (76 FR 50403, August 15, 2011), and 
adding the following new AD:

2012-20-09 Bombardier: Amendment 39-17215. Docket No. FAA-2012-0724; 
Directorate Identifier 2012-NM-043-AD.

(a) Effective Date

    This airworthiness directive (AD) becomes effective November 20, 
2012.

(b) Affected ADs

    This AD supersedes AD 2011-17-04, Amendment 39-16768 (76 FR 
50403, August 15, 2011).

(c) Applicability

    This AD applies to Bombardier, Inc. Model DHC-8-400, -401, and -
402 airplanes, certificated in any category, having serial numbers 
4001 through 4247 inclusive.

(d) Subject

    (d) Air Transport Association (ATA) of America Code 32: Landing 
Gear.

(e) Reason

    This AD was prompted by the determination that an operational 
check must be done after reidentifying the bumper plate to ensure 
the identified unsafe condition is

[[Page 63217]]

addressed. We are issuing this AD to detect and correct failure of 
the main landing gear (MLG) to extend and lock, which could 
adversely affect the safe landing of the airplane.

(f) Compliance

    You are responsible for having the actions required by this AD 
performed within the compliance times specified, unless the actions 
have already been done.

(g) Retained Actions for All Airplanes

    Within 2,000 flight hours after September 19, 2011 (the 
effective date of AD 2011-17-04, Amendment 39-16768 (76 FR 50403, 
August 15, 2011)): Incorporate Bombardier Modsum 4-113645, including 
performing a detailed visual inspection for damage or cracks of the 
bumper plate and base fitting and replacing any damaged or cracked 
part, in accordance with the Accomplishment Instructions of 
Bombardier Service Bulletin 84-32-74, Revision A, dated May 17, 
2010. Do all applicable replacements before further flight.


    Note 1 to paragraphs (g) and (h) of this AD:  Bombardier Service 
Bulletin 84-32-74, Revision A, dated May 17, 2010, includes an 
operational check of the alternate extension system of the MLG. If 
the operational check fails, guidance on doing corrective actions 
can be found in the Bombardier Q400 Dash 8 Aircraft Maintenance 
Manual.

(h) Retained Actions for Airplanes Having Certain Bumper Plates

    For airplanes on which a bumper plate having part number 
85424082-101 or 85424082-103 is installed on which the rework 
specified in Bombardier Repair Drawing 8/4-54-553 has been done: 
Within 1,000 flight hours after September 19, 2011 (the effective 
date of AD 2011-17-04, Amendment 39-16768 (76 FR 50403, August 15, 
2011)), reidentify the bumper plate, in accordance with paragraph 
3.B., step (8) of the Accomplishment Instructions of Bombardier 
Service Bulletin 84-32-74, Revision A, dated May 17, 2010.

(i) Retained Credit for Previous Actions

    This paragraph provides credit for the modification required by 
paragraph (h) of this AD by incorporation of Bombardier Modsum 4-
113645 if the modification was performed before September 19, 2011 
(the effective date of AD 2011-17-04, Amendment 39-16768 (76 FR 
50403, August 15, 2011)), using Bombardier Service Bulletin 84-32-
74, dated December 23, 2009 (which is not incorporated by reference 
in this AD); and provided the modification is done within the 
compliance time specified in paragraph (h) of this AD.

(j) New Requirements of This AD: Operational Check for Airplanes on 
Which the Action Required by Paragraph (h) of This AD Is Done

    Concurrently with doing the actions required by paragraph (h) of 
this AD, or within 30 days after the effective date of this AD, 
whichever occurs later: Perform an operational check of the 
alternate extension system of the MLG, in accordance with the 
Accomplishment Instructions of Bombardier Service Bulletin 84-32-74, 
Revision A, dated May 17, 2010. If the operational check fails, 
before further flight, repair in accordance with a method approved 
by either the Manager, New York Aircraft Certification Office (ACO), 
FAA; or the Transport Canada Civil Aviation (TCCA) (or its delegated 
agent).

    Note 2 to paragraph (j) of this AD:  If the operational check 
fails, guidance on doing the repair can be found in the Bombardier 
Q400 Dash 8 Aircraft Maintenance Manual.

(k) New Credit for Previous Actions

    This paragraph provides credit for actions required by paragraph 
(g) of this AD, if those actions were performed before the effective 
date of this AD, provided the operational check specified in 
paragraph (j) of this AD is done within the compliance time 
specified in paragraph (g) of this AD, or within 30 days after the 
effective date of this AD, whichever occurs later, using Bombardier 
Service Bulletin 84-32-74, dated December 23, 2009 (which is not 
incorporated by reference in this AD).

(l) Other FAA AD Provisions

    The following provisions also apply to this AD:
    (1) Alternative Methods of Compliance (AMOCs): The Manager, New 
York ACO, ANE-170, FAA, has the authority to approve AMOCs for this 
AD, if requested using the procedures found in 14 CFR 39.19. In 
accordance with 14 CFR 39.19, send your request to your principal 
inspector or local Flight Standards District Office, as appropriate. 
If sending information directly to the New York ACO, send it 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, notify your appropriate principal inspector, or lacking a 
principal inspector, the manager of the local flight standards 
district office/certificate holding 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.

(m) Related Information

    (1) Refer to MCAI Canadian Airworthiness Directive CF-2010-23, 
dated July 21, 2010; and Bombardier Service Bulletin 84-32-74, 
Revision A, dated May 17, 2010; for related information.
    (2) For service information identified in this AD, contact 
Bombardier, Inc., Q-Series Technical Help Desk, 123 Garratt 
Boulevard, Toronto, Ontario M3K 1Y5, Canada; telephone 416-375-4000; 
fax 416-375-4539; email thd.qseries@aero.bombardier.com; Internet 
http://www.bombardier.com.

(n) Material Incorporated by Reference

    (1) The Director of the Federal Register approved the 
incorporation by reference (IBR) of the service information listed 
in this paragraph under 5 U.S.C. 552(a) and 1 CFR part 51.
    (2) You must use this service information as applicable to do 
the actions required by this AD, unless the AD specifies otherwise.
    (3) The following service information was approved for IBR on 
September 19, 2011 (76 FR 50403, August 15, 2011).
    (i) Bombardier Service Bulletin 84-32-74, Revision A, dated May 
17, 2010.
    (ii) Reserved.
    (4) For service information identified in this AD, contact 
Bombardier, Inc., Q-Series Technical Help Desk, 123 Garratt 
Boulevard, Toronto, Ontario M3K 1Y5, Canada; telephone 416-375-4000; 
fax 416-375-4539; email thd.qseries@aero.bombardier.com; Internet 
http://www.bombardier.com.
    (5) You may review copies of the service information at the FAA, 
Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, WA. 
For information on the availability of this material at the FAA, 
call 425-227-1221.
    (6) You may view this 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/cfr/ibr-locations.html.

    Issued in Renton, Washington, on October 4, 2012.
Dionne Palermo,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2012-25109 Filed 10-15-12; 8:45 am]
BILLING CODE 4910-13-P


