AD 94-13-01

This amendment adopts a new airworthiness directive (AD), applicable to certain Jetstream Model 4101 airplanes, that requires installation of new fairlead assemblies and P-clips; inspection to detect damage of the wiring harness at the wing rear spars; repair or replacement of any damaged wiring harness with a new wiring harness assembly; and verification of the position of the currently installed P-clips, and repositioning, if necessary. This amendment is prompted by a report of abrasion of an electrical power cable in the wiring harness at the wing rear spar. The actions specified by this AD are intended to prevent abrasion of electrical power cables in the wiring harnesses at the wing rear spars, which could lead to a dormant failure of emergency fuel and hydraulic shutoff services.

Final rule

94-13-01 JETSTREAM AIRCRAFT LIMITED: Amendment 39-8941. Docket 93-NM-198-AD.
Applicability: Model 4101 airplanes having constructor numbers 41004 through 41016 inclusive, certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent abrasion of the electrical power cables in the wiring harnesses at the wing rear spars, which could lead to a dormant failure of emergency fuel and hydraulic shutoff services, accomplish the following:

(a) Within 3 months after the effective date of this AD, install new fairleads and P-clips, perform a visual inspection to detect damage of the wiring harness at the left and right wing rear spar, and verify that the currently installed P-clips are properly positioned; in accordance with Jetstream Series 4100 Service Bulletin J41-57-003, dated October 13, 1993.

(1) If any wiring harness is found to be damaged, prior to further flight, accomplish the requirements of either paragraph(a)(1)(i) or (a)(1)(ii) of this AD.

(i) Replace the damaged wiring harness with a new wiring harness assembly in accordance with Jetstream Series 4100 Aircraft Maintenance Manual. Or

(ii) Repair the damaged wiring harness in accordance with a method approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate.

(2) If any currently installed P-clip is found to be improperly positioned, prior to further flight, reposition the P-clip in accordance with the service bulletin.

(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. 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 methodsof compliance with this AD, if any, may be obtained from the 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 inspection shall be done in accordance with Jetstream Series 4100 Service Bulletin J41-57-003, dated October 13, 1993. 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, Inc., 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 July 20, 1994.

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 Jetstream Model 4101 airplanes was published in the Federal Register on February 14, 1994 (59 FR 6933). That action proposed to require installation of new fairlead assemblies and P-clips; inspection to detect damage of the wiring harness at the wing rear spars; repair or replacement of any damaged wiring harness with a new wiring harness assembly; and verification of the position of the currently installed P-clips, and repositioning, if necessary.

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 12 airplanes of U.S. registry will be affected by this AD, that it will take approximately 2 work hours per airplane to accomplish the required actions, and that the average labor rate is $55 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 $1,320, or $110 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 amendspart 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.

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