AD 83-19-04

83-19-04 SOCIETE NATIONALE INDUSTRIELLE AEROSPATIALE (SNIAS): Amendment 39-4732. Applies to all SNIAS Model 355 series helicopters that have splined flange, P/N 355A34-1062-20, attached to the forward end of the oil cooler fan wheel.

Compliance is required as indicated unless already accomplished.

To prevent possible loss of tail rotor drive, accomplish the following:

(a) Within the next 50 hours time in service after the effective date of this AD, inspect the splined flange (P/N 355A34-1062-20) as prescribed in SNIAS Model 355 Maintenance Manual, Section 65.10.00.602, paragraph 2, or FAA approved equivalent.

(b) Repeat the inspection prescribed in paragraph (a) above at intervals not to exceed 100 hours, until the splined flange (P/N 355A34-1062-20) is replaced with a new splined flange (P/N 355A34-1078-20).

(c) Any equivalent method of compliance with this AD must be approved by the Manager, Aircraft Certification Division, Federal Aviation Administration, 4400 Blue Mound Road, Fort Worth, Texas 76101, or by the Manager, Aircraft Certification Staff, AEU-100, FAA, Europe, Africa, and Middle East Office, Federal Aviation Administration, c/o American Embassy, Brussels, Belgium.

(d) In accordance with Section 21.197, flight is permitted to a base where the inspections required by this AD may be accomplished.

This amendment becomes effective October 14, 1983.