[Federal Register Volume 59, Number 197 (Thursday, October 13, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-24452]


[[Page Unknown]]

[Federal Register: October 13, 1994]


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DEPARTMENT OF TRANSPORTATION
14 CFR Part 39

[Docket No. 94-NM-39-AD; Amendment 39-9041; AD 94-20-12]

 

Airworthiness Directives; Israel Aircraft Industries (IAI) Model 
1125 Westwind Astra 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 IAI Model 1125 Westwind Astra airplanes, that 
requires relocation of the ground cable in the slat power drive unit. 
This amendment is prompted by a report that the drive system for the 
leading edge slat stopped in transit during flight on a Model 1125 
Westwind Astra airplane. This incident was caused by an improper ground 
connection for the electric motor of the slat drive system, which 
resulted in arcing and an open electrical circuit. The actions 
specified by this AD are intended to prevent possible fuel vapor fire 
due to electrical arcing in an area where fuel vapors might be present 
and the inability to move the slats during flight due to an open 
electrical circuit.

DATES: Effective November 14, 1994.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of November 14, 1994.

ADDRESSES: The service information referenced in this AD may be 
obtained from Astra Jet Corporation, Technical Publications, 77 
McCullough Drive, Suite 11, New Castle, Delaware 19720-9813. 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: Tim Dulin, Aerospace Engineer, 
Standardization Branch, ANM-113, FAA, Transport Airplane Directorate, 
1601 Lind Avenue SW., Renton, Washington 98055-4056; telephone (206) 
227-2141; 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 Israel Aircraft Industries 
(IAI) Model 1125 Westwind Astra airplanes was published in the Federal 
Register on May 5, 1994 (59 FR 23174). That action proposed to require 
relocation of the ground cable in the slat power drive unit.
    Interested persons have been afforded an opportunity to participate 
in the making of this amendment. No comments were submitted in response 
to the proposal or the FAA's determination of the cost to the public. 
The FAA has determined that air safety and the public interest require 
the adoption of the rule as proposed.
    The FAA estimates that 52 airplanes of U.S. registry will be 
affected by this AD, that it will take approximately 3 work hours per 
airplane to accomplish the required actions, and that the average labor 
rate is $55 per work hour. Required parts will cost approximately $53 
per airplane. Based on these figures, the total cost impact of the AD 
on U.S. operators is estimated to be $11,336, or $218 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 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:

94-20-12 Israel Aircraft Industries Limited: Amendment 39-9041. 
Docket 94-NM-39-AD.

    Applicability: Model 1125 Westwind Astra airplanes; serial 
numbers 004 through 066 inclusive, and 068; certificated in any 
category.
    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent possible fuel vapor fire due to electrical arcing in 
an area where fuel vapors might be present and the inability to move 
the slats during flight due to an open electrical circuit, 
accomplish the following:
    (a) Within 50 hours time-in-service after the effective date of 
this AD, relocate the ground cable in the slat power drive unit in 
accordance with Astra Jet Service Bulletin SB 1125-27-110, Revision 
1, dated February 16, 1994.
    (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 
Secs. 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 relocation shall be done in accordance with Astra Jet 
Service Bulletin SB 1125-27-110, Revision 1, dated February 16, 
1994, which contains the following list of effective pages: 

------------------------------------------------------------------------
                                             Revision                   
               Page number                 level shown    Date shown on 
                                             on page          page      
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1-3, 5...................................  1..........  February 16,    
                                                         1994.          
4........................................  Original...  January 19,     
                                                         1994.          
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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 Astra Jet Corporation, 
Technical Publications, 77 McCullough Drive, Suite 11, New Castle, 
Delaware 19720-9813. 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 November 14, 1994.

    Issued in Renton, Washington, on September 28, 1994.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 94-24452 Filed 10-12-94; 8:45 am]
BILLING CODE 4910-13-U