85-15-05 SIKORSKY AIRCRAFT: Letter issued July 23, 1985. Applies to Model S- 61L, N, and NM series helicopters, certificated in any category, that are equipped with main rotor horn eyebolt, P/N S6112-23072-101, or eyebolt assembly, P/N S6112-23072-041.
Compliance is required as indicated.
For helicopters with main rotor horn eyebolt or eyebolt assembly with more than 6,800 hours time in service upon receipt of this AD, compliance is required prior to further flight, unless already accomplished, and thereafter at intervals not to exceed 6,800 hours time in service.
For helicopters with main rotor horn eyebolt or eyebolt assembly with 6,800 or less hours time in service upon receipt of this AD, compliance is required prior to the accumulation of 6,800 hours time in service, unless already accomplished, and thereafter at intervals not to exceed 6,800 hours time in service.
To prevent possible failure of the main rotor horn eyebolt or eyebolt assembly, accomplishthe following:
(A) Remove and replace the main rotor horn eyebolt or eyebolt assembly with a new or airworthy part of the same part number that has less than 6,800 hours time in service, in accordance with Sikorsky S-61L Maintenance Manual 4045-101, Section 65-12-10, dated March 15, 1973, or S-61N Maintenance Manual 4045-80, Section 65-12-10, dated November 15, 1972.
(B) Special flight permits not to exceed 6 flight hours may be issued in accordance with FAR Sections 21.197 and 21.199 to operate helicopters to a base for replacement of the main rotor horn eyebolt or eyebolt assembly as required by this AD.
(C) Alternate repairs, modifications, or other means of compliance with the AD which provide an equivalent level of safety must be approved by the Manager, Boston Aircraft Certification Office, FAA, New England Region, 12 New England Executive Park,Burlington, Massachusetts 01803.
This airworthiness directive becomes effective upon receipt.