AD 71-26-01

71-26-01 BOEING: Amdt. 39-1362 as amended by Amendment 39-1387. Applies to Model 727 series airplanes listed in Boeing Service Bulletin 32-196, dated 16 September 1971, and Revision 1, dated 24 November 1971, or later FAA approved revisions, incorporating main landing gear actuator beam support link shaft P/N 69-19167-1 and -2.

Compliance required as indicated: To detect cracks in the main landing gear actuator beam support link shaft, accomplish the following:

(a) For all shafts which have accumulated 12,000 or more landing cycles on or after 25 January 1972, inspect the shaft within the next 1000 landings after 25 January 1972, unless already accomplished within the last 1000 landings, and thereafter at intervals not to exceed 2000 landings since the last inspection, per (b) below, until the shaft is replaced or reworked per (c) and (d) below. (b) Inspect the shaft in accordance with Boeing Service Bulletin 32-196, Revision 1, dated 24 November 1971, or later FAA approved revisions, or an equivalent inspection approved by the Chief, Aircraft Engineering Division, FAA, Western Region. If evidence of a crack is found, replace the shaft, prior to further flight, with shaft P/N 69-19167-3 or with a shaft that (1) has accumulated less than 12,000 landing cycles, or (2) has been previously inspected per this AD, and found to be uncracked, or (3) has been reworked per (c) below. (c) Rework or replace shafts per Boeing Service Bulletin 32-196, Revision 1, dated 24 November 1971, or later FAA approved revisions, or an equivalent rework approved by the Chief, Aircraft Engineering Division, FAA, Western Region. (d) Within 16,000 landings after such rework per (c) above, replace all shafts with acceptable shafts as identified in (b) above. Identify the shafts replaced so as to prevent inadvertent return to service. (e) For the purpose of this AD, when conclusive records are not available to show the number of landings accumulated by a particular shaft, the number of landings may be computed by dividing the airplane time in service since the shaft was installed in the airplane by the operator's fleet average time per flight for his model 727 airplanes. (f) Inspections prescribed by this AD do not apply to new replacement shafts P/N 69- 19167-3 installed on Boeing 727 aircraft.

Amendment 39-1362 became effective January 25, 1972. This Amendment 39-1387 becomes effective February 4, 1972.