[Federal Register Volume 59, Number 86 (Thursday, May 5, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-8685]


[[Page Unknown]]

[Federal Register: May 5, 1994]


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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39

[Docket No. 93-NM-186-AD; Amendment 39-8881; AD 94-08-09]

 

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 Jetstream Model ATP airplanes, that requires a one-time 
inspection and appropriate torque loading check of certain wing top 
surface stringer joint fasteners, and correction of discrepancies. This 
amendment is prompted by a report of loose fasteners on the wing top 
surface stringer joint bolts at Rib 0. The actions specified by this AD 
are intended to prevent reduced structural integrity of the wing top 
surface stringer joints at Rib 0, which subsequently could lead to 
reduced structural integrity of the wing.

DATES: Effective June 6, 1994.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of June 6, 1994.

ADDRESSES: The service information referenced in this AD may be 
obtained from Jetstream Aircraft, Inc., Librarian for Service 
Bulletins, 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 to include an airworthiness directive (AD) that is 
applicable to Jetstream Model ATP airplanes was published in the 
Federal Register on December 15, 1993 (58 FR 65569). That action 
proposed to require a one-time inspection and appropriate torque 
loading check of certain wing top surface stringer joint fasteners, and 
correction of discrepancies.
    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 proposal.
    Since issuance of the notice, Jetstream Aircraft Limited has issued 
Revision 3 of BAe ATP Service Bulletin ATP-57-14, dated December 15, 
1993. This revision of the service bulletin is essentially identical to 
Revision 1, which was referenced in the notice, but contains certain 
editorial changes. The FAA has revised the final rule to include a 
reference to Revision 3 of the service bulletin as an additional source 
of appropriate service information.
    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 with the change previously 
described. The FAA has determined that this change will neither 
increase the economic burden on any operator nor increase the scope of 
the AD.
    The FAA estimates that 10 airplanes of U.S. registry will be 
affected by this AD, that it will take approximately 50 work hours per 
airplane to accomplish the required actions, and that the average labor 
rate is $55 per work hour. Based on these figures, the total cost 
impact of the AD on U.S. operators is estimated to be $27,500, or 
$2,750 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 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 14 CFR part 
39 of the Federal Aviation Regulations 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:

94-08-09 Jetstream Aircraft Limited (formerly British Aerospace): 
Amendment 39-8881. Docket 93-NM-186-AD.

    Applicability: Model ATP airplanes; serial numbers 2001 through 
2053 inclusive, and 2055; certificated in any category.
    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent reduced structural integrity of the wing top surface 
stringer joints at Rib 0, which subsequently could lead to reduced 
structural integrity of the wing, accomplish the following:
    (a) Prior to the accumulation of 10,000 total hours time-in-
service, or within the next 600 hours time-in-service after the 
effective date of this AD, whichever occurs later, perform a 
detailed visual inspection and appropriate torque loading check of 
the fasteners in the stringer joint brackets (part number 
JD534J0015) at the wing top surface stringer joints for stringers 1 
through 19 at Rib 0, in accordance with paragraph 2.A. of British 
Aerospace BAe ATP Service Bulletin ATP-57-14, Revision 1, dated 
September 27, 1993; or Revision 3, dated December 15, 1993. If any 
discrepancy, as specified in the service bulletin, is detected, 
prior to further flight, correct it in accordance with the service 
bulletin.
    (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: 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 
Federal Aviation Regulations (FAR) 21.197 and 21.199 to operate the 
airplane to a location where the requirements of this AD can be 
accomplished.
    (d) The inspection, torque loading check, and correction of 
discrepancies shall be done in accordance with the following British 
Aerospace BAe ATP Service Bulletins, which contain the specified 
list of effective pages:

----------------------------------------------------------------------------------------------------------------
                                                                            Revision level                      
     Service bulletin number and date                  Page No.              shown on page   Date shown on page 
----------------------------------------------------------------------------------------------------------------
ATP-57-14, Revision 1, Sept. 27, 1993.....  1-3...........................               1  Sept. 27, 1993.     
                                            4-5, 7, 9, 11, 13, 15.........               0  Aug. 14, 1993.      
                                            6, 8, 10, 12, 14..............           (\1\)  (\1\)               
ATP-57-14, Revision 3, Dec. 15, 1993......  1-2...........................               3  Dec. 15, 1993.      
                                            3-5...........................               2  Nov. 24, 1993.      
                                            7, 9, 11, 13, 15..............               0  Aug. 14, 1993.      
                                            6, 8, 10, 12, 14..............           (\1\)  (\1\)               
----------------------------------------------------------------------------------------------------------------
\1\These papers are not used.                                                                                   

    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., Librarian for 
Service Bulletins, 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 June 6, 1994.

    Issued in Renton, Washington, on April 6, 1994.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 94-8685 Filed 5-4-94; 8:45 am]
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