Airworthiness Directives; Robert E. Rust, Jr. Model DeHavilland DH.C1 Chipmunk 21, DH.C1 Chipmunk 22, and DH.C1 Chipmunk 22A Airplanes

[Federal Register Volume 75, Number 170 (Thursday, September 2, 2010)]
[Rules and Regulations]
[Pages 53861-53863]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2010-21741]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. FAA-2010-0632; Directorate Identifier 2010-CE-025-AD; 
Amendment 39-16426; AD 2010-18-01]
RIN 2120-AA64


Airworthiness Directives; Robert E. Rust, Jr. Model DeHavilland 
DH.C1 Chipmunk 21, DH.C1 Chipmunk 22, and DH.C1 Chipmunk 22A 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 all 
Robert E. Rust, Jr. Models DeHavilland DH.C1 Chipmunk 21, DH.C1 
Chipmunk 22, and DH.C1 Chipmunk 22A airplanes. This AD requires you to 
do a one-time inspection of the flap operating system for an unapproved 
latch plate design installation, with replacement as necessary. This AD 
results from a report of a latch plate failing in service that was not 
made in accordance with the applicable de Havilland drawing. We are 
issuing this AD to detect and correct an unauthorized latch plate 
design installation which could result in an un-commanded retraction of 
the flaps. This failure could lead to a stall during a landing 
approach.

[[Page 53862]]


DATES: This AD becomes effective on October 7, 2010.
    On October 7, 2010, the Director of the Federal Register approved 
the incorporation by reference of certain publications listed in this 
AD.

ADDRESSES: For service information identified in this AD, contact de 
Havilland Support Limited, Duxford Airfield, Cambridgeshire, CB22 4QR, 
England, phone: +44 (0) 1223 830090; fax: +44 (0) 1223 830085; e-mail: 
[email protected]; Internet: http://www.dhsupport.com/.
    To view the AD docket, go to U.S. Department of Transportation, 
Docket Operations, M-30, West Building Ground Floor, Room W12-140, 1200 
New Jersey Avenue, SE., Washington, DC 20590, or on the Internet at 
http://www.regulations.gov. The docket number is FAA-2010-0632; 
Directorate Identifier 2010-CE-025-AD.

FOR FURTHER INFORMATION CONTACT: Carey O'Kelley, Aerospace Engineer, 
FAA, Atlanta Aircraft Certification Office (ACO), 1701 Columbia Avenue, 
College Park, Georgia 30337; telephone: (404) 474-5543; fax: (404) 474-
5606.

SUPPLEMENTARY INFORMATION:

Discussion

    On June 14, 2010, we issued a proposal to amend part 39 of the 
Federal Aviation Regulations (14 CFR part 39) to include an AD that 
would apply to all Robert E. Rust, Jr. Models DeHavilland DH.C1 
Chipmunk 21, DH.C1 Chipmunk 22, and DH.C1 Chipmunk 22A airplanes. This 
proposal was published in the Federal Register as a notice of proposed 
rulemaking (NPRM) on June 21, 2010 (75 FR 34956). The NPRM proposed to 
require a one-time inspection of the flap operating system for an 
unapproved latch plate design installation with replacement as 
necessary.

Comments

    We provided the public the opportunity to participate in developing 
this AD. We received no comments on the proposal or on the 
determination of the cost to the public.

Conclusion

    We have carefully reviewed the available data and determined that 
air safety and the public interest require adopting the AD as proposed 
except for minor editorial corrections. We have determined that these 
minor corrections:
    <bullet> Are consistent with the intent that was proposed in the 
NPRM for correcting the unsafe condition; and
    <bullet> Do not add any additional burden upon the public than was 
already proposed in the NPRM.

Costs of Compliance

    We estimate that this AD affects 64 airplanes in the U.S. registry.
    We estimate the following costs to do the inspection:

----------------------------------------------------------------------------------------------------------------
                                                                                                     Total cost
                   Labor cost                                 Parts cost               Total cost      on U.S.
                                                                                      per airplane    operators
----------------------------------------------------------------------------------------------------------------
3 work-hours x $85 per hour = $255..............  Not Applicable....................         $255       $16,320
----------------------------------------------------------------------------------------------------------------

    We estimate the following costs to do any necessary replacements 
that would be required based on the results of the inspection. We have 
no way of determining the number of airplanes that may need this 
replacement:

------------------------------------------------------------------------
                                                             Total cost
                 Labor cost                    Parts cost   per airplane
------------------------------------------------------------------------
.5 work-hour x $85 per hour = $42.50........         $175       $217.50
------------------------------------------------------------------------

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 AD.

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 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 summary of the costs to comply with this AD (and 
other information as included in the Regulatory Evaluation) and placed 
it in the AD Docket. You may get a copy of this summary by sending a 
request to us at the address listed under ADDRESSES. Include ``Docket 
No. FAA-2010-0632; Directorate Identifier 2010-CE-025-AD'' in your 
request.

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 Federal Aviation Administration amends part 39 of 
the Federal Aviation Regulations (14 CFR part 39) as follows:

PART 39--AIRWORTHINESS DIRECTIVES

    1. The authority citation for part 39 continues to read as follows:

    Authority: 49 U.S.C. 106(g), 40113, 44701.

[[Page 53863]]

Sec.  39.13  [Amended]

0
2. FAA amends Sec.  39.13 by adding the following new AD:

2010-18-01 Robert E. Rust, Jr.: Amendment 39-16426; Docket No. FAA-
2010-0632; Directorate Identifier 2010-CE-025-AD.

Effective Date

    (a) This AD becomes effective on October 7, 2010.

Affected ADs

    (b) None.

Applicability

    (c) This AD applies to Models DeHavilland DH.C1 Chipmunk 21, 
DH.C1 Chipmunk 22, and DH.C1 Chipmunk 22A airplanes, all serial 
numbers, that are certificated in any category.

    Note:  These airplanes are also identified as CHIPMUNK 22A, 
CHIPMUNK DHC-1T10, CHIPMUNK T.10 MK-22, DH.C1 MK22A, DHC-1, DHC-1 
CHIPMUNK, DHC-1 CHIPMUNK 22, DHC-1 SERIES 22, or DHC-1 T.MK. 10.

Subject

    (d) Air Transport Association of America (ATA) Code 27: Flight 
Controls.

Unsafe Condition

    (e) This AD results from a report of a latch plate supplied 
under part number (P/N) C1-CF-1489 failing in service. The part in 
question was not manufactured to the applicable de Havilland 
drawing. The unapproved latch plate was made of a shaft that was 
pressed into a plate, rather than being machined from bar material 
as one piece. The shaft and plate on the unapproved part can become 
separated or bent, resulting in rapid wear and failure of the part. 
This condition, if not corrected, could result in an un-commanded 
retraction of the flaps. This failure could lead to a stall during a 
landing approach.

Compliance

    (f) To address this problem, you must do the following, unless 
already done:

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               Actions                             Compliance                            Procedures
----------------------------------------------------------------------------------------------------------------
(1) Inspect the flap operating        Within 50 hours time-in-service       Follow de Havilland Support Limited
 system to identify the P/N of the     (TIS) after October 7, 2010 (the      Technical News Sheet (TNS) CT(C1)
 latch plate installed. If latch       effective date of this AD) or         No 208 Issue 1, dated January 30,
 plate P/N C1-CF-1489 is installed,    within 90 days after October 7,       2009.
 inspect the latch plate to            2010 (the effective date of this
 determine if it is in compliance      AD), whichever occurs first.
 with the design standard. An
 unapproved latch plate P/N C1-CF-
 1489 is made from two pieces
 pressed together while one that
 complies with the design standard
 is machined in one piece from bar
 material.
(2) If during the inspection          Before further flight after the       Follow de Havilland Support Limited
 required in paragraph (f)(1) of       inspection where the unapproved       TNS CT(C1) No 208 Issue 1, dated
 this AD an unapproved latch plate P/  latch plate P/N C1-CF-1849 was        January 30, 2009.
 N C1-CF-1489 is found, replace the    found.
 latch plate with a latch plate that
 complies with the design standard.
 The following U.S. standard
 hardware may be substituted for the
 hardware specified in the service
 information:
(i) 1/16'' diameter cotter pin that
 is P/N MS24665-153 (or equivalent)
 in place of split pin P/N SP90/C;
 and
(ii) Washer that is P/N MS15795-806B
 (or equivalent) in place of washer
 P/N SP13/B.
----------------------------------------------------------------------------------------------------------------

Alternative Methods of Compliance (AMOCs)

    (g) The Manager, Atlanta Aircraft Certification Office (ACO), 
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: Carey O'Kelley, Aerospace Engineer, FAA, Atlanta ACO, 1701 
Columbia Avenue, College Park, Georgia 30337; telephone: (404) 474-
5543; fax: (404) 474-5606. 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.

Material Incorporated by Reference

    (h) You must use de Havilland Support Limited TNS CT(C1) No 208 
Issue 1, dated January 30, 2009, 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 de 
Havilland Support Limited, Duxford Airfield, Cambridgeshire, CB22 
4QR, England, phone: +44 (0) 1223 830090; fax: +44 (0) 1223 830085; 
e-mail: [email protected]; Internet: http://www.dhsupport.com/.
    (3) You may review copies of the service information 
incorporated by reference for this AD at the FAA, Central Region, 
Office of the Regional Counsel, 901 Locust, Kansas City, Missouri 
64106. For information on the availability of this material at the 
Central Region, call (816) 329-3768.
    (4) You may also review copies of the service information 
incorporated by reference for this AD 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.

    Issued in Kansas City, Missouri, on August 25, 2010.
John R. Colomy,
Acting Manager, Small Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 2010-21741 Filed 9-1-10; 8:45 am]
BILLING CODE 4910-13-P

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