90-17-10 BRITISH AEROSPACE, PLC: Amendment 39-6698. Docket No. 90-NM-73-AD.
Applicability: All Model BAC 1-11 200 and 400 series airplanes, certificated in any category.
Compliance: Required as indicated, unless previously accomplished.
To detect cracks in the right and left main landing gear (MLG) pintle forward reaction rod lug and the rear bearing spigot, and to prevent a collapse of the MLG, accomplish the following:
A. Prior to the accumulation of 30,000 landings or within 1,400 landings after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 1,400 landings, perform an ultrasonic inspection of the forward reaction rod lug on all pintles Pre-Modification PM3247, in accordance with British Aerospace Alert Service Bulletin 32-A-PM5492, Issue 2, dated October 18, 1989 (Reference Appendix 1, and Figures 1 and 2). If cracks are suspected as a result of this inspection, perform a dye penetrant inspection with thefront reaction rod disconnected and the spherical bearing housing and bushing removed from the pintle lug in accordance with the service bulletin.
B. Prior to the accumulation of 30,000 landings or within 1,400 landings after the effective date of this AD, whichever occurs later, unless accomplished within the last 2,800 landings, and thereafter at intervals not to exceed 4,200 landings, perform a dye penetrant inspection of the forward reaction rod lug on all pintles Pre-Modification PM3247, with the front reaction rod disconnected and the spherical bearinghousing and bushing removed from the pintle lug, in accordance with British Aerospace Alert Service Bulletin 32-A-PM5492. Issue 2, dated October 18, 1989.
C. Perform the initial and repetitive ultrasonic inspections of the right and left MLG pintle rear bearing spigots, in accordance with British Aerospace Alert Service Bulletin 32-A-PM5492, Issue 2, dated October 18, 1989, at the following intervals:
1. Prior tothe accumulation of 25,000 landings, or within 1,000 landings after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 1,000 landings, perform an inspection of pintles having part numbers identified in paragraph 2.3 of the service bulletin.
2. Prior to the accumulation of 30,000 landings, or within 1,400 landings after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 1,400 landings, perform an inspection of pintles having part numbers identified in paragraph 2.4 of the service bulletin.
3. Prior to the accumulation of 40,000 landings, or within 1,400 landings after the effective date of this AD, whichever occurs later, and thereafter at intervals not to exceed 1,400 landings, perform an inspection of pintles having part number identified in paragraph 2.5 of the service bulletin.
D. If cracked pintles are found as a result of the inspections required by paragraphs A., B., or C. of this AD, replace the pintles prior to further flight, in accordance with British Aerospace Alert Service Bulletin 32-A-PM5492, Issue 2, dated October 18, 1989.
E. All right and left MLG pintles must be replaced prior to reaching the life limits (scrap life) identified in Appendix 1 of British Aerospace Alert Service Bulletin 32-A-PM5492, Issue 2, dated October 18, 1989.
F. 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.
G. Special flight permits may be issued in accordance with FAR 21.197 and 21.199 to operate airplanes to abase 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. These documents may be examined at the FAA, Northwest Mountain Region, Transport Airplane Directorate, 1601 Lind Avenue, S.W., Renton, Washington.
This amendment (39-6698, AD 90-17-10) becomes effective on September 17, 1990.