[Federal Register Volume 62, Number 159 (Monday, August 18, 1997)]
[Rules and Regulations]
[Pages 43925-43926]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 97-21740]


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DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 96-NM-178-AD; Amendment 39-10101; AD 97-16-09]
RIN 2120-AA64


Airworthiness Directives; British Aerospace BAe 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 British Aerospace BAe Model ATP airplanes, that 
requires modification of the hydraulic system, and a revision to the 
Airplane Flight Manual (AFM) to include revised procedures for lowering 
the landing gear. This amendment is prompted by a report of uncommanded 
application of the brakes when the direct current (DC) hydraulic pump 
was selected ON with the main hydraulic system operative; this 
situation was caused by build-up of back pressure in the brake supply 
and hydraulic return systems. The actions specified by this AD are 
intended to prevent uncommanded application of the brakes during 
landing, as a result of the build-up of back pressure.

DATES: Effective September 22, 1997.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of September 22, 1997.

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 (425) 
227-2148; fax (425) 227-1149.

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 British Aerospace BAe 
Model ATP airplanes was published in the Federal Register on April 4, 
1997 (62 FR 16113). That action proposed to require modification of the 
hydraulic system. The action also proposed to require revisions to the 
Emergency and Abnormal Procedures Sections of the FAA-approved AFM to 
include revised procedures for lowering the landing gear.

Explanation of Changes Made to the Proposal

    The FAA has revised the final rule to reflect the corporate name 
change of Jetstream Aircraft Limited to British Aerospace Regional 
Aircraft.

Consideration of Comments Received

    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.

Conclusion

    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.

Cost Impact

    The FAA estimates that 10 British Aerospace BAe Model ATP airplanes 
of U.S. registry will be affected by this AD.
    It will take approximately 25 work hours per airplane to accomplish 
the required modification, at an average labor rate of $60 per work 
hour. Required parts will be provided by the manufacturer at no cost to 
operators. Based on these figures, the cost impact of the modification 
required by this AD on U.S. operators is estimated to be $15,000, or 
$1,500 per airplane.
    It will take approximately 1 work hour per airplane to accomplish 
the required AFM revisions, at an average labor rate of $60 per work 
hour. Based on these figures, the cost impact of the

[[Page 43926]]

AFM revisions required by this AD on U.S. operators is estimated to be 
$600, or $60 per airplane.
    The cost impact figures discussed above are 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 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:

97-16-09 British Aerospace Regional Aircraft (Formerly, Jetstream 
Aircraft Limited; British Aerospace (Commercial Aircraft) Limited]: 
Amendment 39-10101. Docket 96-NM-178-AD.

    Applicability: BAe Model ATP airplanes, having constructor's 
numbers 2002 through 2063 inclusive; on which Jetstream Modification 
10303A (Jetstream Service Bulletin ATP 32-41) has been installed; 
certificated in any category.

    Note 1: This AD applies to each airplane identified in the 
preceding applicability provision, regardless of whether it has been 
otherwise 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 uncommanded application of the brakes during landing, 
accomplish the following:
    (a) Within 60 days of the effective date of this AD, accomplish 
paragraphs (a)(1) and (a)(2) of this AD in accordance with Jetstream 
Service Bulletin ATP-29-12, dated September 9, 1995.
    (1) Modify the hydraulic system; and
    (2) Revise the Emergency and Abnormal Procedures Sections of the 
FAA-approved Airplane Flight Manual (AFM) to include the information 
specified in Temporary Revision No. T/52, Issue 1, dated August 16, 
1995, which introduces revised procedures for lowering the landing 
gear, as specified in the temporary revision; and operate the 
airplane in accordance with those limitations and procedures.

    Note 2: Paragraph 1.K. of Jetstream Service Bulletin ATP-29-12, 
dated September 9, 1995, references Temporary Revision No. T/52 as 
an additional source of service information for revising the AFM.
    Note 3: This may be accomplished by inserting a copy of 
Temporary Revision No. T/52 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 the information 
contained in the general revisions is identical to that specified in 
Temporary Revision No. T/52.

    (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 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.
    (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 actions shall be done in accordance with Jetstream 
Service Bulletin ATP-29-12, dated September 9, 1995; and Temporary 
Revision No. T/52, Issue 1, dated August 16, 1995. 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 September 22, 1997.

    Issued in Renton, Washington, on July 29, 1997.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 97-21740 Filed 8-15-97; 8:45 am]
BILLING CODE 4910-13-P