Airworthiness Directives; Jetstream Model ATP Airplanes

[Federal Register Volume 60, Number 122 (Monday, June 26, 1995)]
[Rules and Regulations]
[Pages 32900-32901]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 95-14051]



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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 94-NM-168-AD; Amendment 39-9263; AD 95-12-13]


Airworthiness Directives; Jetstream Model ATP 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 Jetstream Model ATP airplanes, that requires 
installation of modified engine de-ice timers, modification of the 
electrical wiring for the duct heat of the engine air intake, and 
installation of a time delay for the de-ice system in the air intake 
duct of the right engine. This amendment also requires associated 
revisions to the Airplane Flight Manual. This amendment is prompted by 
reports of ice that accreted in the engine air intake ducts and was 
ingested into the engine; this resulted in engine power rollback (loss 
of engine power). The actions specified by this AD are intended to 
prevent loss of multiple engine power during flight in icing 
conditions.

DATES: Effective July 26, 1995.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of July 26, 1995.

ADDRESSES: 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 Federal Aviation Administration (FAA), Transport 
Airplane Directorate, Rules Docket, 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:
William Schroeder, Aerospace Engineer, Standardization Branch, ANM-113, 
FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, 
Washington, 98055-4056; telephone (206) 227-2148; fax (206) 227-1320.

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 Jetstream Model ATP 
airplanes was published in the Federal Register on December 20, 1994 
(59 FR 65516). That action proposed to require installation of new de-
ice timers and an associated revision to the AFM; installation of a 
system that automates a 20-second delay between turning on the left 
engine intake de-ice system and turning on the right engine intake de-
ice system; and installation of modified electrical wiring for the 
flexible ducts and lips of the engine air intake.
    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. Due consideration has been given to 
the single comment received.
    The commenter supports the proposed rule.
    After careful review of the available data, including the comment 
noted above, the FAA has determined that air safety and the public 
interest require the adoption of the rule as proposed.
    The FAA estimates that 10 airplanes of U.S. registry will be 
affected by this AD, that it will take approximately 72 work hours per 
airplane to accomplish the required actions, and that the average labor 
rate is $60 per work hour. Required parts would be provided by the 
manufacturer at no cost to the operators. Based on these figures, the 
total cost impact of the AD on U.S. operators is estimated to be 
$43,200, or $4,320 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.
    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 or 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. App. 1354(a), 1421 and 1423; 49 U.S.C. 
106(g); and 14 CFR 11.89.


Sec. 39.13  [Amended]

    2. Section 39.13 is amended by adding the following new 
airworthiness directive:

95-12-13 Jetstream Aircraft Limited (Formerly British Aerospace 
Commerical Aircraft, Limited): Amendment 39-9263. Docket 94-NM-168-
AD.

    Applicability: Model ATP airplanes having constructor numbers 
2002 through 2063 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 (c) 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 engine power rollback during flight in icing 
conditions, due to ingestion of accreted ice, accomplish the 
following:
    (a) For airplanes having constructor numbers 2002 through 2056 
inclusive: [[Page 32901]] Within 90 days after the effective date of 
this AD, install modified de-ice timers for the left and right 
engines (Modification 30146A), in accordance with Jetstream Aircraft 
Limited Service Bulletin ATP-30-39-30146A, dated July 29, 1994; and 
revise the FAA-approved Airplane Flight Manual (AFM) to include the 
information specified in Temporary Revision T/41, Issue 1, dated 
November 15, 1994.

    Note 2: The revision of the AFM required by this paragraph may 
be accomplished by inserting a copy of Temporary Revision T/41 in 
the AFM. When this temporary revision has been incorporated into 
general revisions of the AFM, the general revisions may be inserted 
in the AFM, provided that the information contained in the general 
revisions is identical to that specified in Temporary Revision T/41.

    (b) For airplanes having constructor numbers 2002 through 2063 
inclusive: Within 90 days after the effective date of this AD, 
accomplish paragraphs (b)(1) and (b)(2) of this AD:
    (1) Install the modified electrical wiring for the flexible 
ducts and lips of the engine air intake (Modification 30143A) in 
accordance with Jetstream Aircraft Limited Service Bulletin ATP-30-
37-30143A, dated August 1, 1994, or Revision 1, dated September 5, 
1994.
    (2) Install the automated 20-second delay system (Modification 
35285A) to ensure that the left engine de-ice systems are turned on 
prior to turning on the right engine de-ice systems, in accordance 
with Jetstream Aircraft Limited Service Bulletin ATP-30-30-35285A, 
dated July 15, 1994; and revise the FAA-approved AFM to include the 
information specified in Temporary Revision T/40, Issue 1, dated 
August 3, 1994.

    Note 3: The revision of the AFM required by this paragraph may 
be accomplished by inserting a copy of Temporary Revision T/40 in 
the AFM. When this temporary revision has been incorporated into 
general revisions of the AFM, the general revisions may be inserted 
in the AFM, provided that the information contained in the general 
revisions is identical to that specified in Temporary Revision T/40.

    (c) 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 4: Information concerning the existence of approved 
alternative methods of compliance with this AD, if any, may be 
obtained from the Standardization Branch, ANM-113.

    (d) Special flight permits may be issued in accordance with 
section 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.
    (e) The installation shall be done in accordance with the 
following Jetstream service bulletins, as applicable, which contain 
the specified effective pages:

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                                                                          Revision                              
   Service bulletin referenced and date             Page No.            level shown       Date shown on page    
                                                                          on page                               
----------------------------------------------------------------------------------------------------------------
ATP-30-39-30146A, Original Issue, July     1-7.......................  Original.....  July 29, 1994.            
 29, 1994.                                                                                                      
ATP-30-37-30143A, Original Issue August    1-15......................  Original.....  August 1, 1994.           
 1, 1994.                                                                                                       
ATP-30-37-30143A, Revision 1, September    1-3, 5-10, 14-17..........  1............  September 5, 1994.        
 5, 1994.                                                                                                       
                                           4, 11-13..................  Original.....  August 1, 1994.           
ATP-30-30-35285A, Original Issue, July     1-19......................  Original.....  July 15, 1994.            
 15, 1994.                                                                                                      
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    The amendment of the AFM shall be done in accordance with 
Temporary Revision T/41, Issue 1, dated November 15, 1994; or 
Temporary Revision T/40, Issue 1, dated August 3, 1994; 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 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.

    (f) This amendment becomes effective on July 26, 1995.


    Issued in Renton, Washington, on June 2, 1995.

Darrell M. Pederson,

Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.

[FR Doc. 95-14051 Filed 6-23-95; 8:45 am]

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