[Federal Register Volume 61, Number 102 (Friday, May 24, 1996)]
[Rules and Regulations]
[Pages 26090-26091]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 96-12730]
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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39
[Docket No. 95-NM-197-AD; Amendment 39-9632; AD 96-11-07]
RIN 2120-AA64
Airworthiness Directives; Learjet Model 31 and 35A Airplanes
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule.
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SUMMARY: This amendment adopts a new airworthiness directive (AD),
applicable to certain Learjet Model 31 and 35A airplanes, that requires
replacement of two segments of 16 American Wire Gauge (AWG) wire with 8
AWG wire at the connector that is connected to the auxiliary cabin
heater relay box. This amendment is prompted by a report that two
segments of the 16 AWG wire in the auxiliary cabin heater that were
spliced during production do not provide adequate current-carrying
capacity. The actions specified by this AD are intended to prevent
electrical arcing and a subsequent fire hazard that could result from
wiring with inadequate current-carrying capacity.
DATES: Effective June 28, 1996.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of June 28, 1996.
ADDRESSES: The service information referenced in this AD may be
obtained from Learjet, Inc., One Learjet Way, Wichita, Kansas 67209-
2942. This information may be examined at the Federal Aviation
Administration (FAA), Transport Airplane Directorate, Rules Docket,
1601 Lind Avenue, SW., Renton, Washington; or at the FAA, Wichita
Aircraft Certification Office, Small Airplane Directorate, 1801 Airport
Road, Room 100, Mid-Continent Airport, Wichita, Kansas; or at the
Office of the Federal Register, 800 North Capitol Street, NW., suite
700, Washington, DC.
FOR FURTHER INFORMATION CONTACT: Dale Bleakney, Aerospace Engineer,
Flight Test Branch, ACE-117W, FAA, Small Airplane Directorate, Wichita
Aircraft Certification Office, 1801 Airport Road, Room 100, Mid-
Continent Airport, Wichita, Kansas; telephone (316) 946-4135; fax (316)
946-4407.
SUPPLEMENTARY INFORMATION: A proposal to amend part 39 of the Federal
Aviation Regulations (14 CFR part 39) to include an airworthiness
directive (AD) that is applicable to certain Learjet Model 31 and 35A
airplanes was published in the Federal Register on March 7, 1996 (61 FR
9119). That action proposed to require replacement of two segments of
16 AWG wire with 8 AWG wire at the P190 connector that is connected to
the E33 auxiliary cabin heater relay box.
Interested persons have been afforded an opportunity to participate
in the making of this amendment. No comments were submitted in response
to the proposal or the FAA's determination of the cost to the public.
Conclusion
The FAA has determined that air safety and the public interest
require the adoption of the rule as proposed.
Cost Impact
There are approximately 52 Learjet Model 31 and 35A airplanes of
the affected design in the worldwide fleet. The FAA estimates that 44
airplanes of U.S. registry will be affected by this AD, that it will
take approximately 4 work hours per airplane to accomplish the required
actions, and that the average labor rate is $60 per work hour. Required
parts will be supplied by the manufacturer at no cost to the operators.
Based on these figures, the cost impact of the AD on U.S. operators is
estimated to be $10,560, or $240 per airplane.
The cost impact figure discussed above is based on assumptions that
no operator has yet accomplished any of the requirements of this AD
action, and that no operator would accomplish those actions in the
future if this AD were not adopted.
Regulatory Impact
The regulations adopted herein will not have substantial direct
effects on the States, on the relationship between the national
government and the States, or on the distribution of power and
responsibilities among the various
[[Page 26091]]
levels of government. Therefore, in accordance with Executive Order
12612, it is determined that this final rule does not have sufficient
federalism implications to warrant the preparation of a Federalism
Assessment.
For the reasons discussed above, I certify that this action (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); 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. A final evaluation has been prepared for this action
and it is contained in the Rules Docket. A copy of it may be obtained
from the Rules Docket at the location provided under the caption
ADDRESSES.
List of Subjects in 14 CFR Part 39
Air transportation, Aircraft, Aviation safety, Incorporation by
reference, Safety.
Adoption of the Amendment
Accordingly, pursuant to 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.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
96-11-07 Learjet, Inc.: Amendment 39-9632. Docket 95-NM-197-AD.
Applicability: Model 31 airplanes having serial numbers 31-002
through 31-029 inclusive, and Model 35A airplanes having serial
numbers 35-647 through 35-670 inclusive; certificated in any
category.
Note 1: This AD applies to each airplane identified in the
preceding applicability provision, regardless of whether it has been
modified, altered, or repaired in the area subject to the
requirements of this AD. For airplanes that have been modified,
altered, or repaired so that the performance of the requirements of
this AD is affected, the owner/operator must request approval for an
alternative method of compliance in accordance with paragraph (b) of
this AD. The request should include an assessment of the effect of
the modification, alteration, or repair on the unsafe condition
addressed by this AD; and, if the unsafe condition has not been
eliminated, the request should include specific proposed actions to
address it.
Compliance: Required as indicated, unless accomplished
previously.
To prevent electrical arcing and subsequent fire hazard,
accomplish the following:
(a) Within 6 months after the effective date of this AD, replace
two segments of 16 American Wire Gauge (AWG) wire with 8 AWG wire at
the P190 connector that is connected to the E33 auxiliary cabin
heater relay box, in accordance with Learjet Service Bulletin SB 31-
21-10, dated August 11, 1995 (for Model 31 airplanes), or Learjet
Service Bulletin SB 35-21-24, dated August 11, 1995 (for Model 35A
airplanes), as applicable.
(b) An alternative method of compliance or adjustment of the
compliance time that provides an acceptable level of safety may be
used if approved by the Manager, Wichita Aircraft Certification
Office (ACO), FAA, Small Airplane Directorate. Operators shall
submit their requests through an appropriate FAA Principal
Maintenance Inspector, who may add comments and then send it to the
Manager, Wichita ACO.
Note 2: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the Wichita ACO.
(c) Special flight permits may be issued in accordance with
sections 21.197 and 21.199 of the Federal Aviation Regulations (14
CFR 21.197 and 21.199) to operate the airplane to a location where
the requirements of this AD can be accomplished.
(d) The replacement shall be done in accordance with Learjet
Service Bulletin SB 31-21-10, dated August 11, 1995, or Learjet
Service Bulletin SB 35-21-24, dated August 11, 1995, as applicable.
This incorporation by reference was approved by the Director of the
Federal Register in accordance with 5 U.S.C. 552(a) and 1 CFR part
51. Copies may be obtained from Learjet, Inc., One Learjet Way,
Wichita, Kansas 67209-2942. Copies may be inspected at the FAA,
Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton,
Washington; or at the FAA, Wichita Aircraft Certification Office,
Small Airplane Directorate, 1801 Airport Road, Room 100, Mid-
Continent Airport, Wichita, Kansas; or at the Office of the Federal
Register, 800 North Capitol Street, NW., suite 700, Washington, DC.
(e) This amendment becomes effective on June 28, 1996.
Issued in Renton, Washington, on May 15, 1996.
S.R. Miller,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 96-12730 Filed 5-23-96; 8:45 am]
BILLING CODE 4910-13-U
