66-24-03 BRITISH AIRCRAFT: Amdt. 39-292 Part 39 Federal Register October 4, 1966. Applies to Model BAC 1-11 200 and 400 Series Airplanes.
Compliance required as indicated.
To prevent fatigue failures of the Belleville washer stack of the nose undercarriage up/down lock jack, P/N AB44A39 (200 Series) and P/N AK44A39 (400 Series), accomplish the following:
(a) For airplanes with Belleville washer stacks, P/N AB44B67, with less than 2,300 landings on the effective date of this AD, remove stacks from service before the accumulation of 2,500 landings.
(b) For airplanes with Belleville washer stacks, P/N AB44B67, with 2,300 or more landings on the effective date of this AD, remove stacks from service within the next 200 landings.
(c) For airplanes with Belleville washer stacks, P/N AB44-1791, (with BAC Modification PM2437 washers) with less than 7,800 landings on the effective date of this AD, remove stacks from service before the accumulation of 8,000 landings.(d) For airplanes with Belleville washer stacks, P/N AB44-1791, (with BAC Modification PM2437 washers) with 7,800 or more landings on the effective date of this AD, remove stacks from service within the next 200 landings.
(e) For the purpose of complying with this AD, subject to acceptance by the assigned FAA maintenance inspector, the number of landings may be determined by dividing each airplane's hours' time in service by the operator's fleet average time from takeoff to landing for the airplane type.
(British Aircraft Corporation (B.A.C.) Ltd. Alert Service Bulletin No. 32-A-PM2437 pertains to this subject.)
This directive effective November 3, 1966.