AD 90-21-22

90-21-22 BRITISH AEROSPACE: Amendment 39-6772. Docket No. 90-NM-136-AD.

Applicability: All Model BAe 125-800A series airplanes, on which British Aerospace Modification 253244A has not been incorporated, certificated in any category.

Compliance: Required as indicated, unless previously accomplished.

To prevent failure of a link pin and subsequent reduced structural integrity of the main landing gear (MLG), accomplish the following:

A. Within 30 days after the effective date of this AD, with the airplane on wheels, lubricate the right and left MLG upper and lower torque link pivots (three per landing gear), in accordance with British Aerospace Service Bulletin 32-222, dated November 10, 1989.

1. If grease does appear in all places indicated in the service bulletin, no further action in accordance with this AD is required and the airplane may be returned to service.

2. If grease does not appear in all places indicated in the service bulletin, prior to further flight, disassemble that MLG, perform visual and dye penetrant inspections to detect defects (scoring, wear, necking, ovality, and/or blocked grease holes) and cracks in the pivot pins and bolts, and hand lubricate the torque link pivots, in accordance with the service bulletin.

a. If the condition of the torque link pin or bolt reveals defects or cracks, prior to further flight, replace it with a serviceable part in accordance with the service bulletin.

b. If the clearance between any torque link and the MLG is less than 0.002 inch, carefully abrade the surfaces of the bushes in the torque link to achieve the required .002 inch minimum/.0l0 inch maximum condition, in accordance with the service bulletin.

c. At intervals not to exceed 50 landings, disassemble and repeat the special hand lubrication of the MLG upper and lower torque links, in accordance with the service bulletin.

B. Incorporation of Modification 253244A, in accordance with British Aerospace Service Bulletin 32-222-3244A, Revision 1, dated March 5, 1990, constitutes terminating action for the repetitive lubrication procedures required by paragraph A.2.c. of this AD.

C. An alternate means of compliance or adjustment of the compliance time, which provides an acceptable level of safety, may be used when approved by the Manager, Standardization Branch, ANM- 113, FAA, Transport Airplane Directorate.

NOTE: The request should be submitted directly to the Manager, Standardization Branch, ANM-113, and a copy sent to the cognizant FAA Principal Inspector (PI). The PI will then forward comments or concurrence to the Standardization Branch, ANM-113.

D. 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.

All persons affected by this directive who have not already received the appropriate service documents from the manufacturer may obtain copies upon request to British Aerospace, PLC, Librarian for Service Bulletins, P.O. Box 17414, Dulles International Airport, Washington, D.C. 20041-0414. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue S.W., Renton, Washington.

This amendment (39-6772, AD 90-21-22) becomes effective on November 19, 1990.