AD 89-11-05

89-11-05 MCDONNELL DOUGLAS HELICOPTER COMPANY: Amendment 39-6217.

Applicability: Model 369A (OH-6A) and H series helicopters, certificated in any category, which are equipped with strap pack assemblies, P/N 369A1706-BSC, and have fiberglass tail rotor blades, P/N 369A1607-BSC, 369A1710-BSC, -9, -11 or -13, installed. (Docket No. 89-ASW-07).

NOTE: Strap pack assemblies installed with aluminum tail rotor blades, P/N 369A1613, are not affected by the finite service life reduction unless the strap pack assemblies have been operated with fiberglass tail rotor blades that have been previously installed; in which case, the reduction in finite life applies.

Compliance: Required as indicated, unless already accomplished.

To prevent possible fatigue failure of the tail rotor strap pack assembly, which could result in loss of control of the helicopter, accomplish the following:

(a) Within 15 days after the effective date of this AD, conduct an inspection ofthe helicopter log book to determine if a listed fiberglass blade is, or previously has been, installed on the affected tail rotor strap pack assemblies.

(b) For tail rotor strap pack assemblies, P/N 369A1706-BSC, which have been equipped with a listed fiberglass blade and for the strap packs for which the blade type cannot be determined, the following applies:

(1) For strap pack assemblies which have 3,200 or more hours' time in service on the effective date of this AD, replace the strap pack with a serviceable unit within the next 50 hours' time in service.

(2) For strap pack assemblies which have less than 3,200 hours' time in service on the effective date of this AD, replace the strap pack with a serviceable unit before the accumulation of 3,250 hours' time in service.

(c) In accordance with Sections 21.197 and 21.199, the helicopter may be flown to a base where compliance with the AD may be accomplished.

This amendment (39-6217, AD 89-11-05) becomes effective on June 6, 1989.