AD 71-20-05

71-20-05 HUGHES: Amdt. 39-1301 as amended by Amendment 39-1359. Applies to Model 269A, 269A-1, and 269B Helicopters.

Compliance required as indicated.

To prevent failures of idler pulley bearings accomplish the following:

(a) Within 50 hours time in service after the effective date of this AD, unless already accomplished, remove from service the aluminum idler pulley shaft, P/N 269A5440 (if installed) and idler pulley bearings, and install steel idler pulley shaft, P/N 269A5438 and idler pulley bearings, P/N 269A5050-58, in accordance with Hughes Service Information Notice N-1.4, dated September 15, 1971, or later FAA approved revision, or an equivalent installation and procedure approved by the Chief, Aircraft Engineering Division, FAA Western Region. Mutilate bearings and aluminum shafts to prevent return to service.

(b) After the accomplishment of (a), above, at intervals not to exceed 200 hours time in service thereafter, replace the idler pulley bearingsin accordance with Hughes Service Information N-95, dated September 15, 1971, or later FAA approved revisions, or an equivalent replacement and procedure approved by the Chief, Aircraft Engineering Division, FAA Western Region. Mutilate old bearings to prevent return to service.

This supersedes Amendment 39-77, (30 F.R. 7371), AD 65-12-02, as revised on February 2, 1966 (31 F.R. 1267).

Amendment 39-1301 became effective October 1, 1971.

This amendment 39-1359 becomes effective December 18, 1971.