AD 92-10-10

92-10-10 BOEING: Amendment 39-8244. Docket No. 91-NM-216-AD.

Applicability: Model 707 and 720 series airplanes, equipped with brake part numbers (P/N) identified in paragraph (a) of this AD, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent the loss of main landing gear braking effectiveness, accomplish the following:

(a) Within 180 days after the effective date of this AD, accomplish paragraphs (a)(1) and (a)(2) of this AD:

(1) Inspect the main landing gear brakes, having brake part numbers shown below, for wear. Any brake worn more than the maximum wear limit specified below must be replaced, prior to further flight, with a brake within that limit.

Brake Mfr. Brake P/N Boeing P/N Maximum Wear Limit

Bendix 150550 10-3072-1,-11 0.60 inch Bendix 2601775 None 0.70 inch BFGoodrich 2-756-2 10-60228-1 0.51 inch BFGoodrich 2-784-1 10-3379-11 0.35 inch BFGoodrich 2-991 10-60228-8 0.51 inch ABS 9560569 10-60818-1 0.528 inch

(2) Incorporate the maximum brake wear limits specified in paragraph (a)(1) of this AD into the FAA-approved maintenance inspection program.

(b) An alternative method of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. The request shall be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Seattle ACO.

(c) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to a base in order to comply with the requirements of this AD.

(d) This amendment becomes effective on July 2, 1992.