81-02-10 BELL: Amendment 39-4025. Applies to Models 214B and 214B-1 helicopters, serial numbers up to and including S/N 28049.
Compliance is required as indicated unless already accomplished.
To prevent a clutch failure which will result in the loss of engine power to the main rotor, accomplish the following:
(a) The freewheeling clutch assembly, P/N 214-040-021-001, must be removed from service and P/N 214-040-021-103 clutch assembly installed according to the following schedule;
(1) P/N 214-040-021-001 clutch assemblies with 290 or more hours' time in service on the effective date of this AD must be removed from service within the next 10 hours' time in service.
(2) P/N 214-040-021-001 clutch assemblies with less than 290 hours' time in service on the effective date of this AD must be removed from service prior to attaining 300 hours' time in service.
(3) P/N 214-040-021-001 clutch assemblies with unknown time in service must be removed within the next ten hours' time in service.
NOTE: BHT Alert Service Bulletin No. 214-80-13, dated August 22, 1980, pertains to this subject.
(b) Special flight permits may be issued in accordance with FAR 21.197 and FAR 21.199 to fly aircraft to a base where this AD can be accomplished.
(c) Any alternate equivalent method of compliance with this AD must be approved by the Chief, Engineering and Manufacturing Branch, Flight Standards Division, Southwest Region, Federal Aviation Administration.
This AD supersedes AD 80-07-11 (Amdt. 39-3726, 45 FR 20778).
The manufacturer's specifications and procedures identified and described in this directive are incorporated herein and made a part hereof pursuant to 5 U.S.C. 552(a)(1). All persons affected by this directive who have not already received these documents from the manufacturer may obtain copies upon request to Bell Helicopter Textron, Product Support Department, Post Office Box 482, Fort Worth, Texas 73101. These documents may also be examined at the Office of the Regional Counsel, Southwest Region, FAA, 4400 Blue Mound Road, Fort Worth, Texas, and at the FAA Headquarters, 800 Independence Avenue, S.W., Washington, D.C.
A historical file on this AD, which includes the incorporated material in full, is maintained by the FAA at their headquarters in Washington, D.C., and at the Southwest Regional Office in Fort Worth, Texas.
This amendment becomes effective January 26, 1981.