[Federal Register Volume 60, Number 176 (Tuesday, September 12, 1995)]
[Rules and Regulations]
[Pages 47265-47266]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-22457]
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Rules and Regulations
Federal Register
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having general applicability and legal effect, most of which are keyed
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Federal Register / Vol. 60, No. 176 / Tuesday, September 12, 1995 /
Rules and Regulations
[[Page 47265]]
DEPARTMENT OF TRANSPORTATION
Federal Aviation Administration
14 CFR Part 39
[Docket No. 95-NM-25-AD; Amendment 39-9365; AD 95-19-04]
Airworthiness Directives; Learjet Model 35, 35A, 36, 36A, 55,
55B, and 55C 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 35, 35A, 36, 36A, 55, 55B, and 55C
airplanes, that requires installation of a placard on the instrument
panel in the cockpit to advise the flightcrew that the Omega navigation
system may be inoperative at certain engine speeds. This amendment is
prompted by reports of loss of certain navigation signals during
extended over water operation. The actions specified by this AD are
intended to prevent excessive deviation from the intended flight path
due to loss of navigation signals, which could result in a potentially
low-fuel condition or a traffic conflict.
DATES: Effective October 12, 1995.
ADDRESSES: The service information referenced in this AD may be
obtained from Gates Learjet, Mid-Continent Airport, P. O. Box 7707,
Wichita, Kansas 67277. 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: C. Dale Bleakney, Aerospace Engineer,
ACE-130W, Systems and Equipment Branch, FAA, Wichita Aircraft
Certification Office, Small Airplane Directorate, 1801 Airport Road,
Room 100, Mid-Continent Airport, Wichita, Kansas 67209; 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 35, 35A, 36,
36A, 55, 55B, and 55C airplanes was published in the Federal Register
on May 16, 1995 (60 FR 26003). That action proposed to require
installation of a placard on the instrument panel in the cockpit to
advise the flightcrew that the Omega navigation system may be
inoperative when engine speed reaches 92.5% N2. -
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.
The FAA has determined that air safety and the public interest require
the adoption of the rule as proposed. -
There are approximately 710 Learjet Model 35, 35A, 36, 36A, 55,
55B, and 55C airplanes of the affected design in the worldwide fleet.
The FAA estimates that 177 airplanes of U.S. registry will be affected
by this AD, that it will take approximately 1 work hour per airplane to
accomplish the required actions, and that the average labor rate is $60
per work hour. The cost of required parts (local manufacture of a
placard) is negligible. Based on these figures, the total cost impact
of the AD on U.S. operators is estimated to be $10,620, or $60 per
airplane. -
The total 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. -
Should an operator elect to accomplish the optional terminating
action that is provided by this AD action, it will take approximately
14 work hours to accomplish it, at an average labor rate of $60 per
work hour. The cost of required parts will be approximately $3,050 per
airplane. Based on these figures, the total cost impact of the optional
terminating action is $3,890 per airplane. -
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 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, 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 USC 106(g), 40101, 40113, 44701.
Sec. 39.13 [Amended] -
2. Section 39.13 is amended by adding the following new
airworthiness directive:
95-19-04 Learjet: Amendment 39-9365. Docket 95-NM-25-AD.
-Applicability: Model 5, 35A, 36, 36A, 55, 55B, and 55C
airplanes; equipped with
[[Page 47266]]
Global Wulfsburg GNS 500, GNS-1000, and GNS-X Flight Management
Systems, 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 use the authority
provided in paragraph (d) of this AD to request approval from the
FAA. This approval may address either no action, if the current
configuration eliminates the unsafe condition; or different actions
necessary to address the unsafe condition described in this AD. Such
a request should include an assessment of the effect of the changed
configuration on the unsafe condition addressed by this AD. In no
case does the presence of any modification, alteration, or repair
remove any airplane from the applicability of this AD.
-Compliance: Required as indicated, unless accomplished
previously. -
To prevent excessive deviation from the intended flight path
which, if the aircraft is on an extended overwater operation, may
lead to a potential low-fuel condition or a traffic conflict
operation, accomplish the following: -
(a) Within 60 days after the effective date of this AD, install
a placard in a prominent location on the instrument panel that
states: ``VLF/OMEGA MAY BE INOPERATIVE AT 92.5% N2'' -
(b) For Model 35 airplanes, serial numbers 35-001 through 35-603
inclusive; and Model 36, serial numbers 36-001 through 36-053
inclusive: Installation of a GNS 500/1000 generator band reject
filter in accordance with Gates Learjet Airplane Accessory Kit Model
AAK 85-1, dated January 14, 1986, as revised by Airplane Accessory
Kit Change Notice AAK-85-1, Change 1 (undated), constitutes
terminating action for the placard requirement of paragraph (a) of
this AD. Following installation of the filter, the placard required
by paragraph (a) of this AD may be removed. -
(c) For Model 55 airplanes, serial numbers 55-003 through 55-124
inclusive: Installation of a GNS 500/1000 generator band reject
filter in accordance with Gates Learjet Airplane Accessory Kit Model
55 AAK 55-85-2, dated January 14, 1986, as revised by Airplane
Accessory Kit Change Notice AAK No. AAK55-85-2, Change 1 (undated),
constitutes terminating action for the placard requirement of
paragraph (a) of this AD. Following installation of the filter, the
placard required by paragraph (a) of this AD may be removed. -
(d) 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, 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.
-(e) 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. -
(f) This amendment becomes effective on October 12, 1995.
Issued in Renton, Washington, on September 5, 1995.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 95-22457 Filed 9-11-95; 8:45 am]
BILLING CODE 4910-13-U
