AD 75-22-03

75-22-03 HUGHES HELICOPTERS: Amendment 39-2387. Applies to all Hughes Model 369, 369A, 369H, 369HS, 369HE, 369HM, certificated in all categories and military OH- 6A and YOH-6A helicopters incorporating metal tail rotor blades Part Number 369A1613, or -3, in combination with tail rotor drive shaft, Part Number 369A5518.

Compliance required within the next 50 hours time in service, after the effective date of this AD unless already accomplished.

(a) To prevent possible emergency flight situations resulting from failure of the tail rotor drive shaft, replace drive shaft P/N 369A5518 with drive shaft P/N 369A5518-601 in accordance with Part I, B.3. of Hughes Service Information Notice No. HN-86, dated April 28, 1975, or later FAA-approved revisions.

(b) Aircraft may be flown in accordance with FAR 21.197 to a base for the performance of the maintenance described herein.

(c) Equivalent modification procedures may be approved by the Chief, Aircraft Engineering Division, FAA Western Region.

NOTE: Assure that the record to reflect compliance with this AD is made in aircraft records in accordance with FAR's 91.165 and 91.173.

This amendment becomes effective October 24, 1975.