AD 92-12-08

92-12-08 BOEING: Amendment 39-8269. Docket No. 91-NM-233-AD. Supersedes AD 91-18-07, Amendment 39-8010.

Applicability: Model 727 series airplanes; equipped with brake part numbers (P/N) identified in Tables 1 and 2 of this AD, and BFGoodrich brake P/N 2-873; certificated in any category.

Compliance required as indicated, unless accomplished previously.

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

(a) Within 180 days after November 12, 1991 (the effective date of Amendment 39-8010, AD 91-18-07) inspect brakes having the part numbers shown in Table 1, below, for wear. Any brake worn more than the maximum wear limit specified must be replaced, prior to further flight, with either a brake within that maximum wear limit or one built in accordance with the applicable service bulletins specified in paragraphs (c), (d), or (e) of this AD, as applicable.

Table 1

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

BFGoodrich 2-1147 10-61287-10 1.6 inches BFGoodrich 2-1147-1 10-61287-12 1.6 inches BFGoodrich 2-1147-3 10-61287-18 1.6 inches BFGoodrich 2-1147-4 10-61287-25 1.6 inches BFGoodrich 2-1190 10-61287-13 1.6 inches Bendix 2601182-6 10-61287-231.7 inches

(b) Within 180 days after November 12, 1991 (the effective date of Amendment 39-8010, AD 91-18-07), incorporate the maximum brake wear limits specified in paragraph (a) of this AD into the FAA-approved maintenance program.

(c) The allowable wear limits for BFGoodrich (BFG) brake part numbers 2-1147 and 2-1147-1, -3, and -4 may be established in accordance with BFG Service Bulletin No. 2-1147-32-13, dated December 21, 1990, and placed into the operator's FAA-approved maintenance program in lieu of those specified in paragraph (a) of this AD.

(d) The allowable wear limit for BFG brake part number 2-1190 may be established in accordance with BFG Service Bulletin No. 2-1190-32-13, dated December 21, 1990, and placed into the operator's FAA-approved maintenance program in lieu of that specified in paragraph (a) of this AD.

(e) The allowable wear limits for Bendix brake part number 2601182-6 may be established in accordance with Bendix (Allied Signal Aerospace Company) Service Bulletin No. 2601182-32-014, dated January 30, 1991, in lieu of that specified in paragraph (a) of this AD. Either that service bulletin or the wear limit specified in paragraph (a) of this AD shall be placed into the operator's FAA-approved maintenance program, but not both.

(f) Within 180 days after the effective date of this AD, inspect brakes having the part numbers shown in Table 2, below, for wear. Any brake worn more than the maximum wear limit specified must be replaced, prior to further flight, with a brake within that maximum wear limit:

Table 2

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

Bendix 2601182-510-61287-22 1.8 inches BFGoodrich 2-872-5 10-60465-18 0.50 inch

(g) Within 180 days after the effective date of this amendment incorporate the maximum brake wear limits specified in Table 2 of paragraph (f) of this AD into the operator's FAA-approved maintenance program.

(h) For airplanes equipped with brakes having BFGoodrich P/N 2-873: Within 180 days after the effective date of this amendment, incorporate the following into the operator's FAA-approved maintenance program:

"Replace BFGoodrich P/N 2-873 brakes prior to or when the adjuster pin is flush with the adjuster bushing."

(i) 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 theManager, Seattle ACO.

(j) 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.

(k) The alternative maximum brake wear limits shall be established in accordance with BFGoodrich Service Bulletin No. 2-1147-32-13, dated December 21, 1990; BFGoodrich Service Bulletin No. 2-1190-32-13, dated December 21, 1990; or Bendix (Allied Signal Aerospace Company) Service Bulletin No. 2601182-32-014, dated January 30, 1991; as applicable. 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 Boeing Commercial Airplane Group, P.O. Box 3707, Seattle, Washington 98124; Allied-Signal Aerospace Company, Bendix Wheels and Brakes Division, South Bend, Indiana 46628; or BFGoodrich Aerospace, Aircraft Wheels and Brakes, P.O. Box 340, Troy, Ohio 45373. Copies may be inspected at the FAA, Transport Airplane Directorate, 1601 Lind Avenue SW., Renton, Washington; or at the Office of the Federal Register, 1100 L Street NW., Room 8401, Washington, DC.

(l) This amendment becomes effective on August 5, 1992.