Fuel Boost Pump Wiring Conduits

Category - Airframe

Effective Date - Upon Receipt

Recurring - No Supersedes - N/A

Superseded by - T99-12-52

TELEGRAPHIC AD ISSUED ON MAY 21, 1999 DOCKET 99-NM-120-AD.

Applicability: all Model 727 series airplanes, 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 request approval for an alternative method of compliance in accordance with paragraph (e) of this AD. The request should include an assessment of the effect of the modification, alteration, or repair on the unsafe condition addressed by this AD; and, if the unsafe condition has not been eliminated, the request should include specific proposed actions to address it.

Compliance:
Required as indicated, unless accomplished previously. To detect and correct fuel boost pump wiring conduits which have experienced severe chafing and electrical arcing resulting in burn-through of the conduit, accomplish the following:
(a) For airplanes with 50,000 or more total flight hours as of the date of receipt of this AD, within 5 days after receipt of this AD, accomplish the requirements of paragraph (c) of this AD.
(b) For airplanes with less than 50,000 total flight hours as of the date of receipt of this AD, prior to the accumulation of 30,000 total flight hours, or within 10 days after receipt of this AD, whichever occurs later, accomplish the requirements of paragraph (c) of this AD.
(c) Except as provided in paragraph (d) of this AD, perform a boost pump dry bay inspection and applicable follow-on corrective actions, in accordance with steps 1 through 6 of "boost pump dry bay inspection," specified in Boeing All Operator Message M-7200-99-04035, dated May 21, 1999.
(d) For airplanes on which the actions specified in step 5-E-<3> of the All Operator Message are accomplished, the fuel tank in which the conduit has been replaced must be refueled prior to accomplishing step 6.

ALTERNATIVE METHODS OF COMPLIANCE
(e) 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, Seattle Aircraft Certification Office (ACO), 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, Seattle ACO.

Note 2: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Seattle ACO.

SPECIAL FLIGHT PERMITS (f) 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.

AVAILABILITY OF SERVICE INFORMATION
(g) Copies of the applicable service information may be obtained from the Boeing Company, P. O. Box 3707, Seattle, Washington 98124-2207. This information may be examined at the FAA, Transport Airplane Directorate, 1601 Lind Avenue, SW., Renton, Washington.
(h) Telegraphic AD T99-12-51, issued on May 21, becomes effective upon receipt.

For further information contact: Jon Regimbal, Aerospace Engineer, Propulsion Branch, ANM-140S, FAA, Transport Airplane Directorate, Seattle Aircraft Certification Office, 1601 Lind Avenue, SW., Renton, Washington 98055-4056; telephone (425) 227-2687; fax (425) 227-1181.