Airworthiness Directives; British Aerospace Model ATP Airplanes

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.

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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:

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Revision

level

Page No. shown on Date shown on page

page

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1, 3, 6, 15-........................... 2 February 15, 1994.

2, 4, 5, 7-14, 16-19................... 1 February 1, 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 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]

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