Airworthiness Directive 2009-25-02

Airworthiness Directive 2009-25-02

Applicable Manufacturers Service Information:
Twin Commander Aircraft LLC Alert Service Bulletin No. 237, dated May 13, 2005
Twin Commander Aircraft Corporation Custom Kit No. 150, dated July 8, 1994
Gulfstream American Corporation Service Bulletin No. 182, dated March 2, 198
Model Applicability:
Twin Commander Aircraft LLC Model 690, 690A, and 690B airplanes
For complete information on this AD, please see:
AD 2009-25-02 FAA Copy
AD 2009-25-02 Preamble
AD 2009-25-02 CFR Copy
Manufacturer:
Effective Date:
Supersedes:
To detect and correct corrosion on the engine mount beam support straps and
the upper wing skins
Twin Commander Aircraft LLC Category:
Airframe
01/08/2010
Recurring:
No
N/A
Superseded By: N/A
Subject:
Airworthiness Directive 2009-25-02 Summary
Summary:
We are adopting a new airworthiness directive (AD) for certain Twin Commander Aircraft LLC
Models 690, 690A, and 690B airplanes. This AD requires you to inspect between the surface of
the left-hand (LH) and right-hand (RH) upper wing skins and the engine mount beam support
straps for any signs of corrosion, replace the upper steel straps with parts of improved design,
and modify both wings. This AD results from reports that corrosion was found between the mating
surfaces of the wing upper skin surface and the engine mount beam support straps. We are
issuing this AD to detect and correct corrosion on the engine mount beam support straps and the
upper wing skins, which could result in failure of the engine mount beam support straps. This
failure could lead to loss of the engine and possible loss of control of the airplane.

Federal Aviation Administration
SUMMARY: We are adopting a new
airworthiness directive (AD) for certain
Twin Commander Aircraft LLC Models
690, 690A, and 690B airplanes. This AD
requires you to inspect between the
surface of the left-hand (LH) and right-
AGENCY: Federal Aviation
Administration (FAA), DOT.
ACTION: Final rule.
Airworthiness Directives; Twin
Commander Aircraft LLC Models 690,
690A, and 690B Airplanes
63565
Federal Register / Vol. 74, No. 232 / Friday, December 4, 2009 / Rules and Regulations
DEPARTMENT OF TRANSPORTATION
04DER1
14 CFR Part 39
[Docket No. FAA–2009–0778; Directorate
Identifier 2009–CE–040–AD; Amendment
39–16119; AD 2009–25–02]
RIN 2120–AA64

80 work-hours × $80 per hour = $6,400 ......................
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:
• Are consistent with the intent that
was proposed in the NPRM for
correcting the unsafe condition; and
• Do not add any additional burden
upon the public than was already
proposed in the NPRM.
Comment Issue: Extend Compliance
Time
Michael Curtis Pidek, William I.
Smith, and Tom Bayer all state that with
275 airplanes affected by this AD and
only 15 service centers available to do
the actions required in this AD, there is
not enough time to comply with the AD.
All three commenters request an
extension of the compliance time to
allow enough time for the service
centers to schedule the work without
grounding airplanes until the work can
be done.
We do not agree with the commenters.
Over 65 airplanes are already in
compliance with this AD. We have
consulted with Twin Commander
Costs of Compliance
We estimate that this AD will affect
275 airplanes in the U.S. registry.
We estimate the following costs to do
the inspection:
Total cost per
airplane
Total cost on
U.S. operators
Labor cost
VerDate Nov<24>2008 17:09 Dec 03, 2009 Jkt 220001 PO 00000 Frm 00036 Fmt 4700 Sfmt 4700 E:FRFM4DER1.SGM 04DER1
Not applicable ...............................................................
$6,400
$1,760,000
We estimate the following costs to do
any necessary repairs/replacements that
will be required based on the results of
the inspection. We have no way of
determining the number of airplanes
that may need this repair/replacement:
SHORT MODIFICATION—OPTION A*
Total cost per
airplane per
side
Labor cost
Parts cost
250 work-hours × $80 per hour = $20,000 per side ..................
$9,170 per kit per side ...............................................................
$29,170
Parts cost
63566
Federal Register / Vol. 74, No. 232 / Friday, December 4, 2009 / Rules and Regulations
hand (RH) upper wing skins and the
engine mount beam support straps for
any signs of corrosion, replace the upper
steel straps with parts of improved
design, and modify both wings. This AD
results from reports that corrosion was
found between the mating surfaces of
the wing upper skin surface and the
engine mount beam support straps. We
are issuing this AD to detect and correct
corrosion on the engine mount beam
support straps and the upper wing
skins, which could result in failure of
the engine mount beam support straps.
This failure could lead to loss of the
engine and possible loss of control of
the airplane.
DATES: This AD becomes effective on
January 8, 2010.
On January 8, 2010, the Director of the
Federal Register approved the
incorporation by reference of certain
publications listed in this AD.
ADDRESSES: To get the service
information identified in this AD,
contact Twin Commander Aircraft LLC,
18933–59th Avenue, NE., Suite 115,
Arlington, WA 98223, telephone: (360)
435–9797; fax: (360) 435–1112; Internet:
http://www.twincommander.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–2009–0778; Directorate
Identifier 2009–CE–040–AD.
FOR FURTHER INFORMATION CONTACT:
Vince Massey, Aerospace Engineer,
FAA, Seattle Aircraft Certification
Office, 1601 Lind Avenue, SW., Renton,
Washington 98057–3356; telephone:
(425) 917–6475; fax: (425) 917–6590; e-
mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it .
SUPPLEMENTARY INFORMATION:
Aircraft LLC and they have covered this
issue with the service centers. The
service centers know how much work is
required since they have already done
the work on over 65 of the affected
airplanes. The service centers plan on
using multiple teams to work on several
airplanes at the same time. They have
confirmed they can perform the actions
required in this AD in the compliance
time as proposed.
Part of the alternative method of
compliance (AMOC) provisions of 14
CFR 39.19 is an extension of the
compliance time provided a level of
safety acceptable to the FAA is met. The
FAA will review any AMOCs of this
nature on a case-by-case basis. If we
determine the proposal presents an
acceptable level of safety, we will
approve it as an AMOC to the AD.
We are not changing the final rule AD
action based on these comments.
Discussion
On August 21, 2009, 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
certain Twin Commander Aircraft LLC
Models 690, 690A, and 690B airplanes.
This proposal was published in the
Federal Register as a notice of proposed
rulemaking (NPRM) on August 28, 2009
(74 FR 44308). The NPRM proposed to
require you to inspect between the
surface of the LH and RH upper wing
skins and the engine mount beam
support straps for any signs of
corrosion, replace the upper steel straps
with parts of improved design, and
modify both wings.
Comments
We provided the public the
opportunity to participate in developing
this AD. The following presents the
comments received on the proposal and
FAA’s response to each comment:
Conclusion

Note: * Depending on airplane
configuration, airplanes with rectangular
plates will need the Plate and Hardware Kit
$34,770
$9,170 per kit per side ...............................................................
320 work-hours × $80 per hour = $25,600 per side ..................
Parts cost
Labor cost
Total cost per
airplane per
side
LONG MODIFICATION—OPTION C*
STRAP ONLY REPLACEMENT—OPTION D
$9,170 per kit per side ...............................................................
280 work-hours × $80 per hour = $22,400 per side ..................
Parts cost
Labor cost
Total cost per
airplane per
side
MIDDLE MODIFICATION—OPTION B*
Federal Register / Vol. 74, No. 232 / Friday, December 4, 2009 / Rules and Regulations
(SB237–4) at $2,090 per side. Labor to install
this kit is included in Options A, B, and C.
Total cost per
airplane
Total cost per
airplane per
side
Labor cost
Parts cost
75 work-hours × $80 per hour = $6,000 per side ......................
$6,190 per strap per side ...........................................................
$12,190
We estimate the following costs to do
the installation of access holes:
Total cost per
airplane
Total cost on
U.S. operators
Labor cost
Parts cost
30 work-hours × $80 per hour = $2,400 .....................................................................................
$1,293
$3,693
$1,015,575
We estimate the following costs to do
the wing fastener modification:
Total cost on
U.S. operators
VerDate Nov<24>2008 17:09 Dec 03, 2009 Jkt 220001 PO 00000 Frm 00037 Fmt 4700 Sfmt 4700 E:FRFM4DER1.SGM 04DER1
Labor cost
Parts cost
8.5 work-hours × $80 per hour = $680 .......................................................................................
$250
$930
$255,750
Authority for This Rulemaking
that is likely to exist or develop on
products identified in this AD.
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–2009–0778;
Directorate Identifier 2009–CE–040–
AD’’ in your request.
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
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,
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation
safety, Incorporation by reference,
Safety.
Adoption of the Amendment
&#9632; Accordingly, under the authority
delegated to me by the Administrator,
$31,570
63567

Within the next 150 hours time-in-service after
January 8, 2010 (the effective date of this
AD) or within the next 12 months after Jan-
uary 8, 2010 (the effective date of this AD),
whichever occurs first.
Before further flight after the inspection re-
quired in paragraph (e)(1) of this AD.
&#9632; 1. The authority citation for part 39
continues to read as follows:
Authority: 49 U.S.C. 106(g), 40113, 44701.
§ 39.13 [Amended]
&#9632; 2. FAA amends § 39.13 by adding a
new AD to read as follows:
2009–25–02 Twin Commander Aircraft
LLC: Amendment 39–16119; Docket No.
FAA–2009–0778; Directorate Identifier
2009–CE–040–AD.
Models
Serial Nos. (S/Ns)
690 .........
690A ......
All S/Ns
All S/Ns except 11195 and
11279.
All S/Ns except 11361, 11383,
11527, and 11536.
Compliance
(e) To address this problem, you must do
the following, unless already done:
690B ......
Actions Compliance
Procedures
VerDate Nov<24>2008 17:09 Dec 03, 2009 Jkt 220001 PO 00000 Frm 00038 Fmt 4700 Sfmt 4700 E:FRFM4DER1.SGM
Follow Twin Commander Aircraft LLC Alert
Service Bulletin No. 237, dated May 13,
2005, pages 1 through 14.
Follow the Accomplishment Instructions, steps
1 through 4 and 6 through 9, of Twin Com-
mander Aircraft Corporation Custom Kit No.
150, dated July 8, 1994, as specified in
Twin Commander Aircraft LLC Alert Service
Bulletin No. 237, dated May 13, 2005.
Follow Twin Commander Aircraft LLC Alert
Service Bulletin No. 237, dated May 13,
2005, Part II, Options A, B, or C, on pages
15 through 29 and 31.
Follow Twin Commander Aircraft LLC Alert
Service Bulletin No. 237, dated May 13,
2005, Part II, Option D, on pages 30 and
31.
Follow Gulfstream American Corporation
Service Bulletin No. 182, dated March 2,
1981.
(3) If corrosion damage is found during the in-
spection required in paragraph (e)(1) of this
AD, perform necessary modification.
Before further flight after the inspection re-
quired in paragraph (e)(1) of this AD.
(4) If corrosion damage is not found during the
inspection required in paragraph (e)(1) of this
AD, do the upper steel strap replacements.
Before further flight after the inspection re-
quired in paragraph (e)(1) of this AD.
(5) Install additional wing fasteners on the LH
and RH wing.
Before further flight after the inspection re-
quired in paragraph (e)(1) of the AD.
Note: Although not required by this AD,
we highly recommend compliance with Twin
Commander Aircraft Corporation Service
Bulletin No. 217, Revision No. 1, dated May
26, 1993, Engine Nacelle Firewall
Reinforcement; and Twin Commander
Aircraft LLC Alert Service Bulletin No. 239,
dated February 13, 2006, Outboard Flap—
Inboard Hinge Inspection & Reinforcement.
Material Incorporated by Reference
(g) You must use Twin Commander
Aircraft LLC Alert Service Bulletin No. 237,
dated May 13, 2005; Twin Commander
Aircraft Corporation Custom Kit No. 150,
dated July 8, 1994; and Gulfstream American
Corporation Service Bulletin No. 182, dated
March 2, 1981, 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 Twin Commander Aircraft
LLC, 18933—59th Avenue, NE., Arlington,
WA 98223, telephone: (360) 435–9797; fax:
(360) 435–1112; Internet: http://
www.twincommander.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
November 20, 2009.
Margaret Kline,
Acting Manager, Small Airplane Directorate,
Aircraft Certification Service.
[FR Doc. E9–28548 Filed 12–3–09; 8:45 am]
BILLING CODE 4910–13–P
Alternative Methods of Compliance
(AMOCs)
(f) The Manager, Seattle 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: Vince
Massey, Aerospace Engineer, FAA, Seattle
ACO, 1601 Lind Avenue, SW, Renton,
Washington 98057–3356; telephone: (425)
917–6475; fax: (425) 917–6590; email:
This e-mail address is being protected from spambots. You need JavaScript enabled to view it . 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.
(1) Inspect between the surface of the left-hand
(LH) and right-hand (RH) upper wing skins
and the engine mount beam support straps
for any signs of corrosion and determine the
extent of any corrosion found.
(2) Install modification access holes in the LH
and RH lower wing skins.
63568
Federal Register / Vol. 74, No. 232 / Friday, December 4, 2009 / Rules and Regulations
the Federal Aviation Administration
amends part 39 of the Federal Aviation
Regulations (14 CFR part 39) as follows:
Effective Date
(a) This AD becomes effective on January
8, 2010.
Unsafe Condition
(d) This AD results from reports that
corrosion was found between the mating
surfaces of the wing upper skin surface and
the engine mount beam support straps. We
are issuing this AD to detect and correct
corrosion on the engine mount beam support
straps and upper wing skins, which could
result in failure of the engine mount beam
support straps. This failure could lead to loss
of the engine and possible loss of control of
the airplane.
Affected ADs
(b) None.
PART 39—AIRWORTHINESS
DIRECTIVES
Applicability
(c) This AD applies to the following
airplane models and serial numbers that are
certificated in any category:

Dan Weiler
Executive Director of the Cessna Owner Organization
(715) 445-5000, ext. 116
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Daniel
Executive Director
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