AD 92-25-05

92-25-05 BRITISH AEROSPACE: Amendment 39-8420. Docket No. 91-NM-269-AD. Applicability: All Model ATP series airplanes, certificated in any category.

Compliance: Required as indicated, unless accomplished previously.

To prevent structural failure of certain brake torque plates and accompanying brake failure, accomplish the following:

(a) Within 400 landings after the effective date of this AD, revise the FAA-approved Mandatory Life Limitations (Airframe) Section, Chapter 5, Section 05-10-11, Table 1, page 4, of the British Aerospace ATP Aircraft Maintenance Manual, by deleting the existing life limitations for brake torque plates, part numbers AHA 1777 and AHA 1650, and adding the component life limitations listed in Table 1 below. The Maintenance Manual revision may be accomplished by inserting a copy of this AD into the Mandatory Life Limitations (Airframe) Section of the ATP Aircraft Maintenance Manual. Once this revised page of the Maintenance Manual is available from British Aerospace and is inserted into the Maintenance Manual, the copy of this AD may be removed.

TABLE 1 continued MSI/SSI ITEM DESCRIPTION PART NUMBER LIFE LIMITATION

32-42-00-022 Brake torque plate (Post Dunlop Mod 2541) AHM8857 Assembly AHA 1777 14,500 landings

32-42-00-022 Brake torque plate (Pre Dunlop Mod 2541) AHM8857 Assembly AHA 1650 10,000 landings

(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, 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, Standardization Branch, ANM-113.

NOTE: Information concerning the existence of approved alternative methods of compliance with this AD, if any, may be obtained from the Standardization Branch, ANM-113.

(c) 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.

(d) This amendment becomes effective on December 22, 1992.