[Federal Register Volume 75, Number 118 (Monday, June 21, 2010)]
[Proposed Rules]
[Pages 34956-34958]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2010-14989]
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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]
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: Notice of proposed rulemaking (NPRM).
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SUMMARY: We propose to adopt a new airworthiness directive (AD) for all
Robert E. Rust, Jr. Model DeHavilland DH.C1 Chipmunk 21, DH.C1 Chipmunk
22, and DH.C1 Chipmunk 22A airplanes. This proposed AD would require a
one-time inspection of the flap operating system for an unauthorized
latch plate design installation. This proposed 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 proposing this AD to
detect and correct 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.
DATES: We must receive comments on this proposed AD by August 5, 2010.
[[Page 34957]]
ADDRESSES: Use one of the following addresses to comment on this
proposed AD:
Federal eRulemaking Portal: Go to http://www.regulations.gov. Follow the instructions for submitting comments.
Fax: (202) 493-2251.
Mail: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue, SE., Washington, DC 20590.
Hand Delivery: U.S. Department of Transportation, Docket
Operations, M-30, West Building Ground Floor, Room W12-140, 1200 New
Jersey Avenue, SE., Washington, DC 20590, between 9 a.m. and 5 p.m.,
Monday through Friday, except Federal holidays.
For service information identified in this proposed 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/.
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:
Comments Invited
We invite you to send any written relevant data, views, or
arguments regarding this proposed AD. Send your comments to an address
listed under the ADDRESSES section. Include the docket number, ``FAA-
2010-0632; Directorate Identifier 2010-CE-025-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 http://www.regulations.gov, including any personal information you provide. We
will also post a report summarizing each substantive verbal contact we
receive concerning this proposed AD.
Discussion
We have received a report of a latch plate supplied under part
number (P/N) C1-CF-1489 failing in service on a Model DeHavilland DH.C1
Chipmunk 21, DH.C1 Chipmunk 22, or DH.C1 Chipmunk 22A airplane. The
part in question was not manufactured to the de Havilland drawing for
P/N C1-CF-1489. 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.
Relevant Service Information
We have reviewed de Havilland Support Limited Technical News Sheet
(TNS) CT(C1) No 208 Issue 1, dated January 3, 2009. The service
information describes procedures for inspecting the flap operating
system latch plate for an unapproved part installation.
FAA's Determination and Requirements of the Proposed AD
We are proposing this AD because we evaluated all information and
determined the unsafe condition described previously is likely to exist
or develop on other products of the same type design. This proposed AD
would require a one-time inspection of the flap operating system for an
unauthorized latch plate design installation.
Costs of Compliance
We estimate that this proposed AD would affect 64 airplanes in the
U.S. registry.
We estimate the following costs to do the proposed inspection:
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Total cost Total cost
Labor cost Parts cost per on U.S.
airplane operators
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3 work-hours x $85 per hour = Not Applicable. $255 $16,320
$255.
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We estimate the following costs to do any necessary replacements
that would be required based on the results of the proposed inspection.
We have no way of determining the number of airplanes that may need
this replacement:
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Total cost per
Labor cost Parts cost airplane
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.5 work-hour x $85 per hour = $42.50.. $175 $217.50
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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.
[[Page 34958]]
We prepared a regulatory evaluation of the estimated costs to
comply with this proposed AD and placed it in the AD docket.
Examining the AD Docket
You may examine the AD docket that contains the proposed AD, the
regulatory evaluation, any comments received, and other information on
the Internet at http://www.regulations.gov; or in person at the Docket
Management Facility between 9 a.m. and 5 p.m., Monday through Friday,
except Federal holidays. The Docket Office (telephone (800) 647-5527)
is located at the street address stated 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.
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 FAA amends Sec. 39.13 by adding the following new AD:
Robert E. Rust, Jr.: Docket No. FAA-2010-0632; Directorate
Identifier 2010-CE-025-AD.
Comments Due Date
(a) We must receive comments on this airworthiness directive
(AD) action by August 5, 2010.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Model 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 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
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(1) Inspect the flap operating Within 50 hours time-in-service Follow de Havilland Support Limited
system to identify the part number (TIS) after the effective date of Technical News Sheet (TNS) CT(C1)
(P/N) of the latch plate installed. this AD or within 90 days after the No 208 Issue 1, dated January 3,
If latch plate P/N C1-CF-1489 is effective date of this AD, 2009.
installed, inspect the latch plate whichever occurs first.
to determine if it is in compliance
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 3, 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.
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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 Aircraft
Certification Office (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.
Related Information
(h) To get copies of the service information referenced 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.
Issued in Kansas City, Missouri, on June 14, 2010.
Sandra J. Campbell,
Acting Manager, Small Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 2010-14989 Filed 6-18-10; 8:45 am]
BILLING CODE 4910-13-P