[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:

------------------------------------------------------------------------
                         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