[Federal Register: December 5, 2005 (Volume 70, Number 232)]
[Rules and Regulations]
[Page 72358-72360]
From the Federal Register Online via GPO Access [wais.access.gpo.gov]
[DOCID:fr05de05-6]
=======================================================================
-----------------------------------------------------------------------
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. FAA-2005-23144; Directorate Identifier 2005-NM-218-AD;
Amendment 39-14393; AD 2005-24-13]
RIN 2120-AA64
Airworthiness Directives; Learjet Model 45 Airplanes
AGENCY: Federal Aviation Administration (FAA), Department of
Transportation (DOT).
ACTION: Final rule; request for comments.
-----------------------------------------------------------------------
SUMMARY: The FAA is adopting a new airworthiness directive (AD) for
certain Learjet Model 45 airplanes. This AD requires modifying the
electrical wire bundle for the alternator on the left-hand engine,
inspecting for clearance between wire harnesses and engine tubing for
each engine, and corrective actions if necessary. For certain
airplanes, this AD also requires replacing the fuses for the hydraulic
shutoff valves with fuses having higher amperage. This AD results from
a report of a fire in the left-hand engine nacelle. We are issuing this
AD to prevent chafing between the wire bundle for the alternator on
each engine and the hydraulic lines, which could result in a fire in
the engine nacelle.
DATES: This AD becomes effective December 20, 2005.
The Director of the Federal Register approved the incorporation by
reference of certain publications listed in the AD as of December 20,
2005.
We must receive comments on this AD by February 3, 2006.
ADDRESSES: Use one of the following addresses to submit comments on
this AD.
[[Page 72359]]
DOT Docket Web site: Go to http://dms.dot.gov and follow
the instructions for sending your comments electronically.
Government-wide rulemaking Web site: Go to http://www.regulations.gov
and follow the instructions for sending your
comments electronically.
Mail: Docket Management Facility; U.S. Department of
Transportation, 400 Seventh Street SW., Nassif Building, Room PL-401,
Washington, DC 20590.
Fax: (202) 493-2251.
Hand Delivery: Room PL-401 on the plaza level of the
Nassif Building, 400 Seventh Street SW., Washington, DC, between 9 a.m.
and 5 p.m., Monday through Friday, except Federal holidays.
Contact Learjet, Inc., One Learjet Way, Wichita, Kansas 67209-2942,
for service information identified in this AD.
FOR FURTHER INFORMATION CONTACT: James P. Galstad, Aerospace Engineer,
Systems and Propulsion Branch, ACE-116W, FAA, Wichita Aircraft
Certification Office, 1801 Airport Road, Room 100, Mid-Continent
Airport, Wichita, Kansas 67209; telephone (316) 946-4135; fax (316)
946-4107.
SUPPLEMENTARY INFORMATION:
Discussion
We have received a report of a fire in the left-hand engine nacelle
on a Learjet Model 45 airplane. Investigation revealed that an
electrical wire bundle for the engine alternator had chafed a hole in a
hydraulic line. This condition, if not corrected, could result in a
fire in the engine nacelle.
Relevant Service Information
We have reviewed Bombardier Alert Service Bulletin SB A40-71-01,
dated September 29, 2005 (for Learjet Model 45 airplanes with serial
numbers (S/Ns) 45-2001 through 45-2029 inclusive); and Bombardier Alert
Service Bulletin SB A45-71-4, dated September 29, 2005 (for Learjet
Model 45 airplanes with S/Ns 45-005 through 45-273 inclusive). These
service bulletins describe procedures for modifying the electrical wire
bundle for the alternator on the left-hand engine to separate the
wiring from the hydraulic pump lines and to protect the wiring;
inspecting the left and right engines to make sure that the proper
clearances are maintained between all wiring harnesses and engine
tubing; and correcting improper clearances if necessary. The service
bulletins also specify sending a compliance report to the manufacturer.
We have also reviewed Bombardier Service Bulletin SB 40-24-01,
dated April 22, 2005 (for Learjet Model 45 airplanes with S/Ns 45-2001
through 45-2015 inclusive); and Bombardier Service Bulletin SB 45-24-6,
dated April 22, 2005 (for Learjet Model 45 airplanes with serial
numbers 45-005 through 45-254 inclusive). The actions in these service
bulletins must be accomplished before or concurrently with Bombardier
Alert Service Bulletins SB A40-71-01 and SB A45-71-4. Bombardier
Service Bulletin SB 40-24-01 and SB 45-24-6 describe procedures for
replacing the fuses for the hydraulic shutoff valves with fuses having
higher amperage.
Accomplishing the actions specified in the service information is
intended to adequately address the unsafe condition.
FAA's Determination and Requirements of This AD
The unsafe condition described previously is likely to exist or
develop on other airplanes of the same type design. For this reason, we
are issuing this AD to prevent chafing between the wire bundle for the
alternator on each engine and the hydraulic lines, which could result
in a fire in the engine nacelle. This AD requires accomplishing the
actions specified in the applicable service information described
previously, except as discussed under ``Difference Between the AD and
Bombardier Alert Service Bulletins SB A40-71-01 and SB A45-71-4.''
Difference Between the AD and Bombardier Alert Service Bulletins SB
A40-71-01 and SB A45-71-4
Although Bombardier Alert Service Bulletins SB A40-71-01 and SB
A45-71-4 specify sending a compliance report to the manufacturer, this
AD does not include that requirement.
Clarification of Inspection Terminology
In this AD, the ``inspecting for proper clearance'' specified in
Bombardier Alert Service Bulletins SB A40-71-01 and SB A45-71-4, is
referred to as a ``general visual inspection.'' We have included the
definition for this inspection in a note in the AD.
FAA's Determination of the Effective Date
Since an unsafe condition exists that requires the immediate
adoption of this AD, we have found that notice and opportunity for
public comment before issuing this AD are impracticable, and that good
cause exists to make this AD effective in less than 30 days.
Comments Invited
This AD is a final rule that involves requirements that affect
flight safety and was not preceded by notice and an opportunity for
public comment; however, we invite you to submit any relevant written
data, views, or arguments regarding this AD. Send your comments to an
address listed in the ADDRESSES section. Include ``Docket No. FAA-2005-
23144; Directorate Identifier 2005-NM-218-AD'' at the beginning of your
comments. We specifically invite comments on the overall regulatory,
economic, environmental, and energy aspects of the AD that might
suggest a need to modify it.
We will post all comments we receive, without change, to http://dms.dot.gov
, including any personal information you provide. We will
also post a report summarizing each substantive verbal contact with FAA
personnel concerning this AD. Using the search function of that Web
site, anyone can find and read the comments in any of our dockets,
including the name of the individual who sent the comment (or signed
the comment on behalf of an association, business, labor union, etc.).
You may review the DOT's complete Privacy Act Statement in the Federal
Register published on April 11, 2000 (65 FR 19477-78), or you may visit
http://dms.dot.gov.
Examining the Dockets
You may examine the AD docket on the Internet at http://dms.dot.gov
, or in person at the Docket Management Facility office
between 9 a.m. and 5 p.m., Monday through Friday, except Federal
holidays. The Docket Management Facility office (telephone (800) 647-
5227) is located on the plaza level of the Nassif Building at the DOT
street address stated in the ADDRESSES section. Comments will be
available in the AD docket shortly after the Docket Management System
receives them.
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
[[Page 72360]]
products identified in this rulemaking action.
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 the 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.
We prepared a regulatory evaluation of the estimated costs to
comply with this AD and placed it in the AD docket. See the ADDRESSES
section for a location to examine the regulatory evaluation.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
0
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 Federal Aviation Administration (FAA) amends Sec. 39.13 by
adding the following new airworthiness directive (AD):
2005-24-13 Learjet: Amendment 39-14393. Docket No. FAA-2005-23144;
Directorate Identifier 2005-NM-218-AD.
Effective Date
(a) This AD becomes effective December 20, 2005.
Affected ADs
(b) None.
Applicability
(c) This AD applies to Learjet Model 45 airplanes, certificated
in any category; serial numbers (S/Ns) 45-005 through 45-273
inclusive, and 45-2001 through 45-2029 inclusive.
Unsafe Condition
(d) This AD results from a report of a fire in the left-hand
engine nacelle. We are issuing this AD to prevent chafing between
the wire bundle for the alternator on each engine and the hydraulic
lines, which could result in a fire in the engine nacelle.
Compliance
(e) You are responsible for having the actions required by this
AD performed within the compliance times specified, unless the
actions have already been done.
Modification
(f) Within 50 flight hours after the effective date of this AD:
Modify the electrical wire bundle for the alternator on the left-
hand engine; and do a general visual inspection of the left and
right engines to make sure that the proper clearances are maintained
between all wiring harnesses and engine tubing. Correct improper
clearances before further flight. Do all actions in accordance with
the Accomplishment Instructions of the applicable service bulletin
in paragraph (f)(1) or (f)(2) of this AD.
(1) For Learjet Model 45 airplanes with S/Ns 45-2001 through 45-
2029 inclusive: Bombardier Alert Service Bulletin SB A40-71-01,
dated September 29, 2005.
(2) For Learjet Model 45 airplanes with S/Ns 45-005 through 45-
273 inclusive: Bombardier Alert Service Bulletin SB A45-71-4, dated
September 29, 2005.
Note 1: For the purposes of this AD, a general visual inspection
is: ``A visual examination of an interior or exterior area,
installation, or assembly to detect obvious damage, failure, or
irregularity. This level of inspection is made from within touching
distance unless otherwise specified. A mirror may be necessary to
ensure visual access to all surfaces in the inspection area. This
level of inspection is made under normally available lighting
conditions such as daylight, hangar lighting, flashlight, or
droplight and may require removal or opening of access panels or
doors. Stands, ladders, or platforms may be required to gain
proximity to the area being checked.''
Concurrent Requirement
(g) For airplanes with S/Ns identified in paragraphs (g)(1) and
(g)(2) of this AD: Before or concurrently with the modification
required by paragraph (f) of this AD, replace the fuses for the
hydraulic shutoff valves with fuses having higher amperage in
accordance with the Accomplishment Instructions of the applicable
service bulletin in paragraph (g)(1) or (g)(2) of this AD.
(1) For Learjet Model 45 airplanes with S/Ns 45-2001 through 45-
2015 inclusive: Bombardier Service Bulletin SB 40-24-01, dated April
22, 2005.
(2) For Learjet Model 45 airplanes with S/Ns 45-005 through 45-
254 inclusive: Bombardier Service Bulletin SB 45-24-6, dated April
22, 2005.
No Reporting Requirement
(h) Although Bombardier Alert Service Bulletin SB A40-71-01,
dated September 29, 2005; and Bombardier Alert Service Bulletin SB
A45-71-4, dated September 29, 2005; specify sending a compliance
report to the manufacturer, this AD does not include that
requirement.
Alternative Methods of Compliance (AMOCs)
(i)(1) The Manager, Wichita Aircraft Certification Office (ACO),
FAA, has the authority to approve AMOCs for this AD, if requested in
accordance with the procedures found in 14 CFR 39.19.
(2) Before using any AMOC approved in accordance with Sec.
39.19 on any airplane to which the AMOC applies, notify the
appropriate principal inspector in the FAA Flight Standards
Certificate Holding District Office.
Material Incorporated by Reference
(j) You must use the service information listed in Table 1 of
this AD to perform the actions that are required by this AD, unless
the AD specifies otherwise. The Director of the Federal Register
approved the incorporation by reference of these documents in
accordance with 5 U.S.C. 552(a) and 1 CFR part 51. Contact Learjet,
Inc., One Learjet Way, Wichita, Kansas 67209-2942, for a copy of
this service information. You may review copies at the Docket
Management Facility, U.S. Department of Transportation, 400 Seventh
Street SW., room PL-401, Nassif Building, Washington, DC; on the
Internet at http://dms.dot.gov; or at the National Archives and
Records Administration (NARA). For information on the availability
of this material at the NARA, call (202) 741-6030, or go to http://www.archives.gov/federal_register/code_of_federal_regulations/ibr_locations.html
.
Table 1.--Material Incorporated by Reference
------------------------------------------------------------------------
Bombardier service bulletin Date
------------------------------------------------------------------------
Alert Service Bulletin SB A40-71-01.. September 29, 2005.
Alert Service Bulletin SB A45-71-4... September 29, 2005.
Service Bulletin SB 40-24-01......... April 22, 2005.
Service Bulletin SB 45-24-6.......... April 22, 2005.
------------------------------------------------------------------------
Issued in Renton, Washington, on November 18, 2005.
Kalene C. Yanamura,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 05-23510 Filed 12-2-05; 8:45 am]
BILLING CODE 4910-13-P