[Federal Register Volume 60, Number 149 (Thursday, August 3, 1995)]
[Rules and Regulations]
[Pages 39635-39637]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-18981]
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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39
[Docket No. 95-NM-129-AD; Amendment 39-9329; AD 95-16-09]
Airworthiness Directives; Jetstream Model BAe ATP Airplanes
AGENCY: Federal Aviation Administration, DOT.
ACTION: Final rule; request for comments.
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SUMMARY: This amendment adopts a new airworthiness directive (AD) that
is applicable to certain Jetstream Model BAe ATP airplanes. This action
requires modification of the electrical connections at the switches of
the scavenge oil filter and pressure oil filter. This amendment is
prompted by reports indicating that the electrical connections were
miswired at the switches of the scavenge oil filter and pressure oil
filter. The actions specified in this AD are intended to prevent the
circulation of unfiltered oil through the engine without warning to the
flightcrew, due to miswiring of electrical connections. Unfiltered oil
containing contaminants could lead to a precautionary shutdown of the
engine.
DATES: Effective August 18, 1995.
The incorporation by reference of certain publications listed in
the regulations is approved by the Director of the Federal Register as
of August 18, 1995.
Comments for inclusion in the Rules Docket must be received on or
before October 2, 1995.
ADDRESSES: Submit comments in triplicate to the Federal Aviation
Administration (FAA), Transport Airplane Directorate, ANM-103,
Attention: Rules Docket No. 95-NM-129-AD, 1601 Lind Avenue SW., Renton,
Washington 98055-4056.
The service information referenced in this AD may be obtained from
Jetstream Aircraft, Inc., P.O. Box 16029, Dulles International Airport,
Washington, DC 20041-6029. This information may be examined at the FAA,
Transport Airplane Directorate, 1601 Lind Avenue SW., Renton,
Washington; or at the Office of the Federal Register, 800 North Capitol
Street NW., suite 700, Washington, DC.
FOR FURTHER INFORMATION CONTACT: Gregory Dunn, Aerospace Engineer,
Standardization Branch, ANM-113, FAA, Transport Airplane Directorate,
1601 Lind Avenue SW., Renton, Washington 98055-4056; telephone (206)
227-2799; fax (206) 227-1149.
SUPPLEMENTARY INFORMATION: The Civil Aviation Authority (CAA), which is
the airworthiness authority for the United Kingdom, recently notified
the FAA that an unsafe condition may exist on certain Jetstream Model
BAe ATP airplanes. The CAA advises that it has received reports
indicating that the amber light on the central warning panel did not
illuminate to warn the flight crew that the engine oil filter would be
bypassed. Investigation revealed that the light did not illuminate
because the electrical connections were miswired at the switches of the
scavenge oil filter of the reduction gearbox (RGB) and of the pressure
oil filter. The miswiring configuration was inadvertently included as
part of the original wiring design plan for these airplanes and, thus,
the miswiring occurred during production. Such miswiring could lead to
the circulation of unfiltered oil through the engine without warning to
the flightcrew, which could result in a precautionary shutdown of the
engine due to contaminants in the unfiltered oil.
Jetstream has issued Service Bulletin ATP-79-25-10382A, Revision 1,
dated May 25, 1995, which describes procedures for modification of the
electrical connections at the switches of the scavenge oil filter of
the RGB and of the pressure oil filter, of the left and right engines.
The modification entails rerouting of the 28-volt DC. wiring from pin A
to pin C of the switches. The CAA classified this service bulletin as
mandatory in order to assure the
[[Page 39636]]
continued airworthiness of these airplanes in the United Kingdom.
This airplane model is manufactured in the United Kingdom and is
type certificated for operation in the United States under the
provisions of section 21.29 of the Federal Aviation Regulations (14 CFR
21.29) and the applicable bilateral airworthiness agreement. Pursuant
to this bilateral airworthiness agreement, the CAA has kept the FAA
informed of the situation described above. The FAA has examined the
findings of the CAA, reviewed all available information, and determined
that AD action is necessary for products of this type design that are
certificated for operation in the United States.
Since an unsafe condition has been identified that is likely to
exist or develop on other airplanes of the same type design registered
in the United States, this AD is being issued to prevent the
circulation of unfiltered oil through the engine without warning to the
flightcrew, which could lead to a precautionary shutdown of the engine
due to contaminants in the unfiltered oil. This AD requires
modification of the wiring connections at the switches of the scavenge
oil filter of the RGB and of the pressure oil filter, of the left and
right engines. The actions are required to be accomplished in
accordance with the service bulletin described previously.
Since a situation exists that requires the immediate adoption of
this regulation, it is found that notice and opportunity for prior
public comment hereon are impracticable, and that good cause exists for
making this amendment effective in less than 30 days. Comments Invited
Although this action is in the form of a final rule that involves
requirements affecting flight safety and, thus, was not preceded by
notice and an opportunity for public comment, comments are invited on
this rule. Interested persons are invited to comment on this rule by
submitting such written data, views, or arguments as they may desire.
Communications shall identify the Rules Docket number and be submitted
in triplicate to the address specified under the caption ADDRESSES. All
communications received on or before the closing date for comments will
be considered, and this rule may be amended in light of the comments
received. Factual information that supports the commenter's ideas and
suggestions is extremely helpful in evaluating the effectiveness of the
AD action and determining whether additional rulemaking action would be
needed.
Comments are specifically invited on the overall regulatory,
economic, environmental, and energy aspects of the rule that might
suggest a need to modify the rule. All comments submitted will be
available, both before and after the closing date for comments, in the
Rules Docket for examination by interested persons. A report that
summarizes each FAA-public contact concerned with the substance of this
AD will be filed in the Rules Docket.
Commenters wishing the FAA to acknowledge receipt of their comments
submitted in response to this rule must submit a self-addressed,
stamped postcard on which the following statement is made: ``Comments
to Docket Number 95-NM-129-AD.'' The postcard will be date stamped and
returned to the commenter.
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.
The FAA has determined that this regulation is an emergency
regulation that must be issued immediately to correct an unsafe
condition in aircraft, and that it is not a ``significant regulatory
action'' under Executive Order 12866. It has been determined further
that this action involves an emergency regulation under DOT Regulatory
Policies and Procedures (44 FR 11034, February 26, 1979). If it is
determined that this emergency regulation otherwise would be
significant under DOT Regulatory Policies and Procedures, a final
regulatory evaluation will be prepared and placed in the Rules Docket.
A copy of it, if filed, 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), 40101, 40113, 44701.
Sec. 39.13 [Amended]
2. Section 39.13 is amended by adding the following new
airworthiness directive:
95-16-09 Jetstream Aircraft Limited (Formerly British Aerospace
Commercial Aircraft, Limited.): Amendment 39-9329. Docket 95-NM-129-
AD.
Applicability: Model BAe ATP airplanes having constructor's
numbers 2002 through 2056 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 use the authority
provided in paragraph (b) 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 the flightcrew from being unaware that unfiltered oil
is being circulated through the engine, which may result in a
precautionary shutdown of the engine due to the circulation of
contaminants in unfiltered oil, accomplish the following:
(a) Within 60 days after the effective date of this AD, modify
the wiring connections at the switches of the scavenge oil filter of
the reduction gearbox (RGB) and of the pressure oil filter, of both
the left and right engines, in accordance with Jetstream BAe ATP
Service Bulletin ATP-79-25-10382A, Revision 1, dated May 25, 1995.
(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, Standardization Branch, ANM-113,
FAA, Transport 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,
Standardization Branch, ANM-113.
Note 2: Information concerning the existence of approved
alternative methods of compliance with this AD, if any, may be
obtained from the Standardization Branch, ANM-113.
[[Page 39637]]
(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 modification shall be done in accordance with Jetstream
Aircraft Limited BAe ATP Service Bulletin ATP-79-25-10382A, Revision
1, dated May 25, 1995, which contains the following effective pages:
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Revision level shown on
Page No. page Date shown on page
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1, 3, 7-............... 1-..................... May 25, 1995.
2, 4-6, 8-13-.......... Original-.............. February 10, 1995.
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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 Jetstream Aircraft, Inc., P.O.
Box 16029, Dulles International Airport, Washington, DC 20041-6029.
Copies may be inspected at the FAA, Transport Airplane Directorate,
1601 Lind Avenue, SW., Renton, Washington; or at the Office of the
Federal Register, 800 North Capitol Street, NW., suite 700,
Washington, DC.
(e) This amendment becomes effective on August 18, 1995.
Issued in Renton, Washington, on July 27, 1995.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification
Service.
[FR Doc. 95-18981 Filed 8-2-95; 8:45 am]
BILLING CODE 4910-13-P
