AD 95-21-17 ACTIVE

This amendment adopts a new airworthiness directive (AD), applicable to certain Raytheon Model Hawker 1000 and BAe 125-1000A series airplanes, that requires an inspection to detect damage to an electrical cable loom (wire bundle). This amendment also requires tying back the loom with a cable tie to the cable loom support bracket, and repair, if necessary. This amendment is prompted by a report indicating that damage had occurred to the electrical cable loom. The actions specified by this AD are intended to prevent incorrect fault displays in the cockpit and possible electrical systems failures, as a result of damage to the electrical cable loom.

Final rule.

95-21-17 RAYTHEON CORPORATE JETS, INC. (Formerly de Havilland; Hawker Siddeley; British Aerospace, plc): Amendment 39-9404. Docket 95-NM-42-AD.

Applicability: Model Hawker 1000 and BAe 125-1000A series airplanes; as listed in Raytheon Service Bulletin SB 24-313, dated December 19, 1994; certificated in any category.

NOTE 1: This AD applies to each airplane identified in the preceding applicability provision, regardless of whether it has been modified, altered, or repaired in the area subject to the requirements of this AD. For airplanes that have been modified, altered, or repaired so that the performance of the requirements of this AD is affected, the owner/operator must use the authority provided in paragraph (b) of this AD to request approval from the FAA. This approval may address either no action, if the current configuration eliminates the unsafe condition; or different actions necessary to address the unsafe condition described in this AD. Such a request should include an assessment of the effect of the changed configuration on the unsafe condition addressed by this AD. In no case does the presence of any modification, alteration, or repair remove any airplane from the applicability of this AD.

Compliance: Required as indicated, unless accomplished previously.

To prevent incorrect fault displays in the cockpit and possible electrical systems failures, accomplish the following:

(a) Within 6 months after the effective date of this AD, perform a detailed visual inspection to detect chafing damage of the electrical cable loom (wire bundle) behind the right-hand throttle box cover, and perform continuity and insulation checks and system functional tests, in accordance with Raytheon Service Bulletin SB 24-313, dated December 19, 1994.

(1) If no damage is found, prior to further flight, verify that the arrangement of the cable loom is correct and, using a cable tie, tie back the loom to the cable loom support bracket, in accordance with the service bulletin.

(2) If any damage is found, prior to further flight, repair the damaged loom, in accordance with a method approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate.

(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) tooperate the airplane to a location where the requirements of this AD can be accomplished.

(d) The actions shall be done in accordance with Raytheon Service Bulletin SB 24-313, dated December 19, 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 Raytheon Corporate Jets, Inc., Customer Support Department, Adams Field, P.O. Box 3356, Little Rock, Arkansas 72203. 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 17, 1995.

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 Raytheon Model Hawker 1000 and BAe 125-1000A series airplanes was published in the Federal Register on July 21, 1995 (60 FR 37607). That action proposed to require a one-time detailed visual inspection to detect chafing damage of a certain electrical cable loom located behind the right-hand throttle box cover. That action also proposed tying back the loom with a cable tie to the cable loom support bracket, if no damaged cable is found.

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 19 airplanes of U.S. registry will be affected by this AD, that it will take approximately 1 work hour per airplane to accomplish the required actions, and that the average labor rate is $60 per work hour. Based on these figures, the total cost impact of the AD on U.S. operators is estimated to be $1,140, or $60 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 USC 106(g), 40101, 40113, 44701.

39.13 - [Amended]
2. Section 39.13 is amended by adding the following new airworthiness directive:

The service information referenced in this AD 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 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.

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) 227-1149.