[Federal Register Volume 78, Number 127 (Tuesday, July 2, 2013)]
[Rules and Regulations]
[Pages 39574-39576]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 2013-15402]
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DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2013-0214; Directorate Identifier 2012-NM-152-AD;
Amendment 39-17497; AD 2013-13-09]
RIN 2120-AA64
Airworthiness Directives; Learjet Inc. Airplanes
AGENCY: Federal Aviation Administration (FAA), DOT.
ACTION: Final rule.
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SUMMARY: We are adopting a new airworthiness directive (AD) for certain
Learjet Inc. Model 60 airplanes. This AD was prompted by a report of a
high-speed rejected takeoff caused by all four main landing gear (MLG)
tires blowing out during the takeoff roll. This AD requires installing
new rigid hydraulic tube assemblies to the MLG struts; installing a new
MLG squat switch bracket, modifying the MLG squat switch wire harness;
modifying the MLG anti-skid wheel transducer electrical wire harnesses;
routing and securing the anti-skid wheel and squat switch electrical
wire harnesses to the MLG strut assembly; installing outboard bracket
assemblies, anti-skid shield, forward electrical cover on the forward
stiffener, upper and lower inboard bracket assemblies, and clamps that
support the electrical wire harness; modifying the aft stiffener for
the new electrical wire harness support; installing the aft electrical
cover and strap on the aft stiffener; installing a new flat landing
light lamp if necessary; and, for certain airplanes, installing a new
wheel speed detect box assembly, nutplates, and brackets and a new
thrust reverser interface box, and modifying the wiring for the new
thrust reverser interface box. We are issuing this AD to prevent
failure of the braking system or adverse operation of the spoiler and
thrust reverser system due to external damage, particularly from tire
failure, which could result in loss of control of the airplane.
DATES: This AD is effective August 6, 2013.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in the AD as of August 6,
2013.
ADDRESSES: For service information identified in this AD, contact
Learjet, Inc., One Learjet Way, Wichita, KS 67209-2942; telephone 316-
946-2000; fax 316-946-2220; email [email protected]; Internet
http://www.bombardier.com. You may review copies of the referenced
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.
Examining the AD Docket
You may examine the AD docket 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 AD docket contains this AD, the regulatory evaluation,
any comments received, and other information. The address for the
Docket Office (phone: 800-647-5527) is Document Management Facility,
U.S. Department of Transportation, Docket Operations, M-30, West
Building Ground Floor, Room W12-140, 1200 New Jersey Avenue SE.,
Washington, DC 20590.
FOR FURTHER INFORMATION CONTACT: Don Ristow, Aerospace Engineer,
Mechanical Systems and Propulsion Branch, ACE-116W, FAA, Wichita
Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-
Continent Airport, Wichita, KS 67209; phone: 316-946-4120; fax: 316-
946-4107; email: [email protected].
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.
The NPRM published in the Federal Register on March 27, 2013 (78 FR
18531). The NPRM proposed to require installing new rigid hydraulic
tube assemblies to the MLG struts; installing a new MLG squat switch
bracket; modifying the MLG squat switch wire harness; modifying the MLG
anti-skid wheel transducer electrical wire harnesses; routing and
securing the anti-skid wheel and squat switch electrical wire harnesses
to the MLG strut assembly; installing outboard bracket assemblies,
anti-skid shield, forward electrical cover on the forward stiffener,
upper and lower inboard bracket assemblies, and clamps that support the
electrical wire harness; modifying the aft stiffener for the new
electrical wire harness support; installing the aft electrical cover
and strap on the aft stiffener; installing a new flat landing light
lamp if necessary; and, for certain airplanes, installing a new wheel
speed detect box assembly, nutplates, and brackets and a new thrust
reverser
[[Page 39575]]
interface box, and modifying the wiring for the new thrust reverser
interface box.
Comments
We gave the public the opportunity to participate in developing
this AD. We have considered the comment received. The National
Transportation Safety Board supported the NPRM (78 FR 18531, March 27,
2013).
Conclusion
We reviewed the relevant data, considered the comment received, and
determined that air safety and the public interest require adopting the
AD as proposed except for minor editorial changes. We have determined
that these minor changes:
Are consistent with the intent that was proposed in the
NPRM (78 FR 18531, March 27, 2013) for correcting the unsafe condition;
and
Do not add any additional burden upon the public than was
already proposed in the NPRM (78 FR 18531, March 27, 2013).
Interim Action
We consider this AD to be the second of three ADs that are related
to each other, and collectively address unsafe conditions that might
result from damage to critical components on the landing gear or in the
wheel well that affect the braking, spoiler, and thrust reverser
systems. The manufacturer is currently developing a final modification
for the thrust reverser. Once the new thrust reverser modification is
developed, approved, and available, we might consider additional
rulemaking.
Costs of Compliance
We estimate that this AD affects 275 airplanes of U.S. registry.
We estimate the following costs to comply with this AD:
Estimated Costs
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Action Labor cost Parts cost Cost per product Cost on U.S. operators
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Installation of rigid hydraulic tube Up to 53 work-hours x $85 $7,093 Up to $11,598...................... Up to $3,189,450.
assemblies and MLG squat switch per hour = $4,505.
bracket; modification of MLG squat
switch wire harness and MLG anti-skid
wheel transducer electrical wire
harnesses; and routing and securing
anti-skid wheel and squat switch
electrical wire harnesses to MLG
strut assembly (Bombardier Service
Bulletin 60[dash]32-33, dated July
23, 2012).
Installation of outboard bracket Up to 25 work-hours x $85 17,960 Up to $20,085...................... Up to $5,523,375.
assemblies, anti-skid shield, forward per hour = $2,125.
electrical cover, upper and lower
inboard bracket assemblies, and
clamps; modification of aft
stiffener; and installation of aft
electrical cover and strap, and flat
landing light lamp (Bombardier
Service Bulletin 60-57-7, dated July
23, 2012).
Installation of wheel speed detect box Up to 65 work-hours x $85 1,154 $6,679............................. Up to $881,628.
assembly, nutplates brackets, and per hour = $5,525.
thrust reverser interface box; and
modification of wiring for serial
numbers 60[dash]002 through 60-276
(Bombardier Service Bulletin 60-78-7,
Revision 2, dated May 1, 2006) (132
U.S. airplanes).
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According to the manufacturer, some of the costs of this AD may be
covered under warranty, thereby reducing the cost impact on affected
individuals. We do not control warranty coverage for affected
individuals. As a result, we have included all costs in our cost
estimate.
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
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 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.
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 adding the following new airworthiness
directive (AD):
2013-13-09 Learjet Inc.: Amendment 39-17497; Docket No. FAA-2013-
0214; Directorate Identifier 2012-NM-152-AD.
(a) Effective Date
This AD is effective August 6, 2013.
[[Page 39576]]
(b) Affected ADs
Certain requirements of this AD affect certain requirements of
AD 2010-11-11, Amendment 39-16316 (75 FR 32255, June 8, 2010).
(c) Applicability
This AD applies to Learjet Inc. Model 60 airplanes, certificated
in any category, serial numbers 60-001 through 60-413 inclusive.
(d) Subject
Joint Aircraft System Component (JASC)/Air Transport Association
(ATA) of America Code 32, Landing gear; 57, Wings; 78, Engine
exhaust.
(e) Unsafe Condition
This AD was prompted by a report of a high-speed rejected
takeoff caused by all four main landing gear (MLG) tires blowing out
during the takeoff roll. We are issuing this AD to prevent failure
of the braking system or adverse operation of the spoiler and thrust
reverser system due to external damage, particularly from tire
failure, which could result in loss of control of the airplane.
(f) Compliance
Comply with this AD within the compliance times specified,
unless already done.
(g) Modification and Installation
Within 600 flight hours or 12 months after the effective date of
this AD, whichever occurs first: Do the actions required by
paragraphs (g)(1), (g)(2), and (g)(3) of this AD, as applicable.
(1) For all airplanes: Install new rigid hydraulic tube
assemblies to the MLG struts, install a new MLG squat switch bracket
and modify the MLG squat switch wire harness, modify the MLG anti-
skid wheel transducer electrical wire harnesses, and route and
secure the anti-skid wheel and squat switch electrical wire
harnesses to the MLG strut assembly, in accordance with the
Accomplishment Instructions of Bombardier Service Bulletin 60-32-33,
dated July 23, 2012.
(2) For all airplanes: Install outboard bracket assemblies,
anti-skid shield, forward electrical cover on the forward stiffener,
upper and lower inboard bracket assemblies, and clamps that support
the electrical wire harness; modify the aft stiffener for the new
electrical wire harness support; install the aft electrical cover
and strap on the aft stiffener; and install a new flat landing light
lamp, as applicable; in accordance with the Accomplishment
Instructions of Bombardier Service Bulletin 60-57-7, dated July 23,
2012.
(3) For airplanes having serial numbers 60-002 through 60-276
inclusive: Install a new wheel speed detect box assembly, nutplates,
brackets, and interface box; and modify the wiring for the new
thrust reverser interface box; in accordance with the Accomplishment
Instructions of Bombardier Service Bulletin 60-78-7, Revision 2,
dated May 1, 2006.
(h) Terminating Action for AD 2010-11-11, Amendment 39-16316 (75 FR
32255, June 8, 2010)
After accomplishing the actions required by paragraph (g) of
this AD, the requirement in paragraph (h) of AD 2010-11-11,
Amendment 39-16316 (75 FR 32255, June 8, 2010), to check the nose
and main tire pressures before 96 hours prior to takeoff, is
terminated. All provisions of paragraphs (g) and (h) of AD 2010-11-
11 that are not specifically referenced by this paragraph remain
fully applicable and must be complied with.
(i) Credit for Previous Actions
This paragraph provides credit for the corresponding actions
specified in paragraph (g)(3) of this AD, if those actions were
performed before the effective date of this AD using Bombardier
Service Bulletin SB60-78-7, dated February 21, 2005; or Revision 1,
dated June 30, 2005; which are not incorporated by reference in this
AD.
(j) Alternative Methods of Compliance (AMOCs)
(1) The Manager, Wichita 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. 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 manager of the ACO, send it to the
attention of the person identified in the Related Information
section of this AD.
(2) 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.
(k) Related Information
For more information about this AD, contact Don Ristow,
Aerospace Engineer, Mechanical Systems and Propulsion Branch, ACE-
116W, FAA, Wichita Aircraft Certification Office, 1801 Airport Road,
Room 100, Mid-Continent Airport, Wichita, KS 67209; phone: 316-946-
4120; fax: 316-946-4107; email: [email protected].
(l) 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.
(i) Bombardier Service Bulletin 60-32-33, dated July 23, 2012.
(ii) Bombardier Service Bulletin 60-57-7, dated July 23, 2012.
(iii) Bombardier Service Bulletin 60-78-7, Revision 2, dated May
1, 2006.
(3) For service information identified in this AD, contact
Learjet, Inc., One Learjet Way, Wichita, KS 67209-2942; telephone
316-946-2000; fax 316-946-2220; email [email protected];
Internet http://www.bombardier.com.
(4) You may view this service information at 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.
(5) 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 June 13, 2013.
Jeffrey E. Duven,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 2013-15402 Filed 7-1-13; 8:45 am]
BILLING CODE 4910-13-P