[Federal Register Volume 59, Number 217 (Thursday, November 10, 1994)]
[Unknown Section]
[Page 0]
From the Federal Register Online via the Government Publishing Office [www.gpo.gov]
[FR Doc No: 94-27048]


[[Page Unknown]]

[Federal Register: November 10, 1994]


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


DEPARTMENT OF TRANSPORTATION
14 CFR Part 39

[Docket No. 94-NM-41-AD; Amendment 39-9061; AD 94-22-11]

 

Airworthiness Directives; British Aerospace Model ATP Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Final rule.

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

SUMMARY: This amendment adopts a new airworthiness directive (AD), 
applicable to certain British Aerospace Model ATP airplanes, that 
requires modification of the power supply for the communications 
system. This amendment is prompted by reports of loss of power to the 
communications system due to an electrical fault in the ground crew 
jack box or the handset of the public address (PA) system. The actions 
specified by this AD are intended to prevent the inability of the 
flight crew to communicate with passengers via the PA system and with 
air traffic control due to loss of power to the communication system, 
which may lead to unsafe operation of the airplane.

DATES: Effective December 12, 1994.
    The incorporation by reference of certain publications listed in 
the regulations is approved by the Director of the Federal Register as 
of December 12, 1994.

ADDRESSES: The service information referenced in this AD may be 
obtained from Jetstream Aircraft, Incorporated, 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 British Aerospace Model 
ATP airplanes series airplanes was published in the Federal Register on 
May 11, 1994 (59 FR 24382). That action proposed to require 
modification of the power supply for the communications system.
    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.
    Since issuance of the notice, Jetstream has issued errata sheets 
Numbers 1, 2, and 4, pertaining to Service Bulletin ATP-23-21-35288A. 
Erratum No. 1 was issued March 14, 1994, and adds an additional part 
number to the list of pertinent cable looms that appeared in Revision 2 
of Jetstream Service Bulletin ATP-23-21-35288A. Erratum No. 2 was 
issued April 25, 1994, and corrects certain editorial errors that 
appeared in that same service bulletin. Erratum No. 4 was issued June 
1, 1994, and includes an additional reference to the fuse and circuit 
breaker index that appeared in that same service bulletin. The final 
rule has been revised to add a note referencing the existence of these 
errata sheets. These errata sheets do not require any further work by 
operators who have previously complied with Jetstream Service Bulletin 
ATP-23-21-35288A, Revision 2, dated February 15, 1994.
    After careful review of the available data, 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 30 work hours per 
airplane to accomplish the required actions, and that the average labor 
rate is $60 per work hour. Required parts will be provided by the 
manufacturer at no cost to the operator. Based on these figures, the 
total cost impact of the AD on U.S. operators is estimated to be 
$18,000, or $1,800 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:

94-22-11 British Aerospace: Amendment 39-9061. Docket 94-NM-41-AD.

    Applicability: Model ATP airplanes having constructor's numbers 
2002 through 2063 inclusive, certificated in any category.
    Compliance: Required as indicated, unless accomplished 
previously.
    To prevent the inability of the flight crew to communicate with 
passengers via the public address system and with air traffic 
control due to loss of power to the communication system, which may 
lead to unsafe operation of the airplane, accomplish the following:
    (a) Within 675 hours time-in-service after the effective date of 
this AD, modify the power supply of the communications system 
(Modification 35288A) in accordance with Jetstream Service Bulletin 
ATP-23-21-35288A, Revision 2, dated February 15, 1994.

    Note 1: Jetstream Service Bulletin ATP-23-21-35288A Erratum No. 
1, dated March 14, 1994; Erratum No. 2, dated April 25, 1994; and 
Erratum No. 4, dated June 1, 1994; describe certain editorial 
corrections to Jetstream Service Bulletin ATP-23-21-35288A, Revision 
2.

    (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.

    (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 
Service Bulletin ATP-23-21-35288A, Revision 2, dated February 15, 
1994, which contains the following list of effective pages:

------------------------------------------------------------------------
                                          Revision                      
                                           level                        
                Page No.                  shown on   Date shown on page 
                                            page                        
------------------------------------------------------------------------
1, 3, 6, 15-...........................          2  February 15, 1994.  
2, 4, 5, 7-14, 16-19...................          1  February 1, 1994.   
------------------------------------------------------------------------

    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, 
Incorporated, 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 December 12, 1994.

    Issued in Renton, Washington, on October 26, 1994.
Darrell M. Pederson,
Acting Manager, Transport Airplane Directorate, Aircraft Certification 
Service.
[FR Doc. 94-27048 Filed 11-9-94; 8:45 am]
BILLING CODE 4910-13-U