Airworthiness Directives; Raytheon Corporate Jets Model BAe 125- 1000A Series Airplanes

DEPARTMENT OF TRANSPORTATION

Federal Aviation Administration

14 CFR Part 39

[Docket No. 94-NM-67-AD]

Airworthiness Directives; Raytheon Corporate Jets Model BAe 125-

1000A Series Airplanes

AGENCY: Federal Aviation Administration, DOT.

ACTION: Notice of proposed rulemaking (NPRM).

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SUMMARY: This document proposes the adoption of a new airworthiness

directive (AD) that is applicable to certain Raytheon Corporate Jets

Model BAe 125-1000A series airplanes. This proposal would require

modification of the galley feeder cables and toilet services fuse. This

proposal is prompted by a report that the gauge size of the existing

galley feeder cable is not compatible with the rating of the currently

used toilet services fuse. The actions specified by the proposed AD are

intended to ensure that the subject cables are compatible with the

toilet services fuse in order prevent overheating of the cables, which

could result in smoke and fire in the cabin.

DATES: Comments must be received by September 22, 1994.

ADDRESSES: Submit comments in triplicate to the Federal Aviation

Administration (FAA), Transport Airplane Directorate, ANM-103,

Attention: Rules Docket No. 94-NM-67-AD, 1601 Lind Avenue SW., Renton,

Washington 98055-4056. Comments may be inspected at this location

between 9:00 a.m. and 3:00 p.m., Monday through Friday, except Federal

holidays.

The service information referenced in the proposed rule may be

obtained from Raytheon Corporate Jets, Inc., Customer Support

Department, Adams Field, P.O. Box 3356, Little Rock, Arkansas 72203.

This information may be examined at the FAA, Transport Airplane

Directorate, 1601 Lind Avenue SW., Renton, Washington.

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)

227-1112; fax (206) 227-1100.

SUPPLEMENTARY INFORMATION:

Comments Invited

Interested persons are invited to participate in the making of the

proposed rule by submitting such written data, views, or arguments as

they may desire. Communications shall identify the Rules Docket number

and be submitted in triplicate to the address specified above. All

communications received on or before the closing date for comments,

specified above, will be considered before taking action on the

proposed rule. The proposals contained in this notice may be changed in

light of the comments received.

Comments are specifically invited on the overall regulatory,

economic, environmental, and energy aspects of the proposed rule. All

comments submitted will be available, both before and after the closing

date for comments, in the Rules Docket for examination by interested

persons. A report summarizing each FAA-public contact concerned with

the substance of this proposal will be filed in the Rules Docket.

Commenters wishing the FAA to acknowledge receipt of their comments

submitted in response to this notice must submit a self-addressed,

stamped postcard on which the following statement is made: ``Comments

to Docket Number 94-NM-67-AD.'' The postcard will be date stamped and

returned to the commenter.

Availability of NPRMs

Any person may obtain a copy of this NPRM by submitting a request

to the FAA, Transport Airplane Directorate, ANM-103, Attention: Rules

Docket No. 94-NM-67-AD, 1601 Lind Avenue, SW., Renton, Washington

98055-4056.

Discussion

The Civil Aviation Authority (CAA), which is the airworthiness

authority for the United Kingdom, recently notified the FAA that an

unsafe condition may exist on certain Raytheon Corporate Jets Model BAe

125-1000A series airplanes. The CAA advises that the gauge size of the

galley feeder cables installed on these airplanes is not compatible

with the rating of the toilet services fuses. In the event of a fault

condition, the incompatibility of these items could result in the

cables becoming overheated, which could lead to the generation of smoke

and fire in the cabin. There have been no in-service incidents of such

faults or consequent smoke and fire, however.

Hawker-Raytheon Corporate Jets has issued Service Bulletin SB.25-

75-25A698A&B, dated February 10 1994, that describes procedures for

installing Modification 25A698A&B on airplanes that were furnished with

an ``open plan'' galley. This modification consists of changing the

gauge size of the galley feeder cables (from fuses F1 and F2 on panel

WFA to the left and right galley) from size 10 to size 8; changing the

toilet services fuse F3 from 50A to 30A amperage; and adding a new 20A

fuse to the left and right galley.

Hawker-Raytheon Corporate Jets also has issued Service Bulletin

SB.25-75-25A699A, dated February 10 1994, that describes procedures for

installing Modification 25A699A on airplanes that were furnished with a

``traditional'' galley. This modification consists of changing the

gauge size of the galley feeder cables (from fuses F1 and F2 on panel

WFA to the galley) from size 10 to size 8; changing the toilet services

fuse F3 from 50A to 30A amperage; and adding a new 20A fuse to the

galley.

The CAA classified both of these service bulletins as mandatory.

This airplane model is manufactured in the United Kingdom and is

type certificated for operation in the United States under the

provisions of section 21.29 of the Federal Aviation Regulations (14 CFR

21.29) and the applicable bilateral airworthiness agreement.

Pursuant to this bilateral airworthiness agreement, the CAA has

kept the FAA informed of the situation described above. The FAA has

examined the findings of the CAA, reviewed all available information,

and determined that AD action is necessary for products of this type

design that are certificated for operation in the United States.

Since an unsafe condition has been identified that is likely to

exist or develop on other airplanes of the same type design registered

in the United States, the proposed AD would require modification of the

galley feeder cables and toilet services fuses. The actions would be

required to be accomplished in accordance with the service bulletins

described previously.

The FAA estimates that 4 airplanes of U.S. registry would be

affected by this proposed AD, that it would take approximately 16 work

hours per airplane to accomplish the proposed actions, and that the

average labor rate is $55 per work hour. Required parts would cost

approximately $500 per airplane. Based on these figures, the total cost

impact of the proposed AD on U.S. operators is estimated to be $5,520,

or $1,380 per airplane.

The total cost impact figure discussed above is based on

assumptions that no operator has yet accomplished any of the proposed

requirements of this AD action, and that no operator would accomplish

those actions in the future if this AD were not adopted.

The regulations proposed herein would 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

proposal would not have sufficient federalism implications to warrant

the preparation of a Federalism Assessment.

For the reasons discussed above, I certify that this proposed

regulation (1) is not a ``significant regulatory action'' under

Executive Order 12866; (2) is not a ``significant rule'' under the DOT

Regulatory Policies and Procedures (44 FR 11034, February 26, 1979);

and (3) if promulgated, 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 copy of the draft

regulatory evaluation prepared for this action is contained in the

Rules Docket. A copy of it may be obtained by contacting the Rules

Docket at the location provided under the caption ADDRESSES.''

List of Subjects in 14 CFR Part 39

Air transportation, Aircraft, Aviation safety, Safety.

The Proposed Amendment

Accordingly, pursuant to the authority delegated to me by the

Administrator, the Federal Aviation Administration proposes to amend

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:

Raytheon Corporate Jets, Inc.: Docket 94-NM-67-AD.

Applicability: Model BAe 125-1000A series airplanes; as listed

in Hawker-Raytheon Corporate Jets Service Bulletin SB.25-76-

25A698A&B, dated February 10, 1994, and Hawker-Raytheon Corporate

Jets Service Bulletin SB.25-76-25A699A, dated February 10, 1994;

certificated in any category.

Compliance: Required as indicated, unless accomplished

previously.

To prevent smoke and fire in the cabin due to overheating of

galley cables, accomplish the following: -

(a) For airplanes listed in Hawker-Raytheon Corporate Jets

Service Bulletin SB.25-76-25A698A&B, dated February 10, 1994: Within

100 hours time-in-service after the effective date of this AD,

install Modification 25A698A&B in accordance with that service

bulletin. -

(b) For airplanes listed in Hawker-Raytheon Corporate Jets

Service Bulletin SB.25-76-25A699A, dated February 10, 1994: Within

100 hours time-in-service after the effective date of this AD,

install Modification 25A699A in accordance with that service

bulletin. -

(c) 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.

-(d) 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.

Issued in Renton, Washington, on June 28, 1994.

Darrell M. Pederson,

Acting Manager, Transport Airplane Directorate, Aircraft Certification

Service.

[FR Doc. 94-16158 Filed 7-1-94; 8:45 am]

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