AD 91-04-03 ACTIVE

91-04-03 BRITISH AEROSPACE: Amendment 39-6890. Docket No. 90-NM-234-AD.

Applicability: All Model BAe 125-800A series airplanes, certificated in any category.

Compliance: Required within 60 days after the effective date of this AD, unless previously accomplished.

To detect damage to main landing gear (MLG) components and to prevent reduced structural integrity of the MLG, accomplish the following:

A. Perform a visual inspection of the left and right MLG side stay to wing pick-up fitting for adequate clearance, in accordance with British Aerospace Service Bulletin 32-224, Revision 1, dated August 30, 1990.

1. If clearance is less than 0.025 inch, prior to further flight, perform a dye penetrant inspection and repair, in accordance with British Aerospace Service Bulletin 57-72, dated January 28, 1990, and then proceed to paragraph B. of this AD.

2. If there is a minimum clearance of 0.025 inch around the full circumference, prior to further flight,proceed to paragraph B. of this AD.

B. Disassemble, clean, lubricate, and reassemble and recheck clearance in accordance with British Aerospace Service Bulletin 32-224, Revision 1, dated August 30, 1990.

1. If a minimum clearance of 0.025 inch does not exist, prior to further flight, repair in a manner approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate.

2. If there is a minimum clearance of 0.025 inch, proceed to paragraph C. of this AD.

C. Unless accomplished in accordance with paragraph A.1. of this AD, perform a dye penetrant inspection of the left and right MLG side stay attachment lugs, in accordance with British Aerospace Service Bulletin 57-72, dated January 28, 1990.

1. If a crack is found, prior to further flight, repair in accordance with paragraph 2.A.(5) of the service bulletin, and repeat dye penetrant inspection to ensure all cracks have been removed.

2. If cracks are still evident, prior to further flight, repair in a manner approved by the Manager, Standardization Branch, ANM-113, FAA, Transport Airplane Directorate.

3. If no cracks are found, prior to further flight, thoroughly degrease the blended area, restore protective treatment and surface finish, reinstall side stay assembly, and torque tighten upper side stay locating pin retaining nut to 500 inch-pounds +/- 50 inch-pounds in accordance with paragraphs 2.A.(9) and (10) of the service bulletin.

D. Perform a visual inspection of the left and right MLG side stay center pivot for distortion, in accordance with British Aerospace Service Bulletin 32-225, dated May 30, 1990.

1. If distortion is less than 0.002 inch, prior to further flight, reinstall nut to side stay center pivot, in accordance with paragraph 2.A.(3) of the service bulletin.

2. If distortion is greater than 0.002 inch, prior to further flight, discard nut and replace with new nut, in accordance with paragraphs 2.A.(4) through 2.A.(9)of the service bulletin.

3. If a side stay center pivot nut was found to be distorted and was replaced, prior to further flight, remove the affected side stay from the airplane, disassemble, and perform the following, in accordance with British Aerospace Service Bulletin 32-227, dated August 30, 1990; or Revision 1, dated October 12, 1990:

a. Conduct a visual inspection for cracks using an 8X magnifying glass.

b. Conduct an eddy current inspection of the upper side stay assembly.

c. Conduct a magnetic particle inspection of the lower side stay assembly.

4. If cracked parts are found, prior to further flight, replace with new parts having the same part numbers, and accomplish the following:

a. Restore protective treatment, bond any detached washers, replace any worn or damaged items, and reassemble side stay upper arm to lower arm, and reinstall side stay on airplane in accordance with the service bulletin.

b. Perform adjustment/test procedures in accordance with the service bulletin.

E. 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 Manager, Standardization Branch, ANM-113.

F. 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 (39-6890, AD 91-04-03) becomes effective on March 18, 1991.