AD 92-09-03

92-09-03 MCDONNELL DOUGLAS: Amendment 39-8228. Docket No. 91-NM-239-AD.

Applicability: Model DC-9-80 series and MD-88 airplanes, equipped with brake part numbers identified in paragraph (a) of this AD, 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 the effective date of this AD, inspect the brakes having brake part numbers specified, 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 this limit.

Douglas Brake Part Number

Maximum Wear Limit (inches)

For airplanes with an approved Flight Manual MGTOW of 149,500 lb:

2608892-1

1.20 5004321-3/-4/-5 all Trapezoid 0.65 5004321-6 Bullnose 0.70 " -6 Trapezoid 0.75 " -10 Bullnose 0.70 " -11 Trapezoid (Standard) 1.00 " -11 Trapezoid (Rebalanced) 1.20 " -12 Trapezoid 0.70 5007898 Trapezoid 0.75 5007898-1 Trapezoid 0.80

For airplanes with an approved Flight Manual MGTOW of 160,000 lb:

2608892-1

0.70 5007898 Bullnose 0.45 5007898-1 Trapezoid 0.50

(b) Within 180 days after the effective date of this AD, incorporate the maximum brake wear limits specified in paragraph (a) of this AD, into the FAA-approved maintenance inspection program.

(c) 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, Los Angeles Aircraft Certification Office (ACO), FAA, Transport Airplane Directorate. The request should be forwarded through an FAA Principal Maintenance Inspector, who may concur or comment and then send it to the Manager, Los Angeles ACO.(d) Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate the airplane to a location where the requirements of this AD can be accomplished.

(e) This amendment becomes effective on May 22, 1992.