Airworthiness directives › 2021-10-16
AD 2021-10-16 Airworthiness Directives; Carson Helicopters, Inc.; Croman Corporation; Sikorsky Aircraft Corporation; and Siller Helicopters
Models named: S-61L, SH-3H, S-61A, S-61D, S-61E, S-61V, CH-3E, SH-3A. Read the applicability below — it usually turns on serial or part numbers too.
Applicability*9
This AD applies to all helicopters identified in paragraphs (c)(1) through (6) of this AD, certificated in any category including restricted. (1) Carson Helicopters, Inc., Model S-61L helicopters. (2) Carson Helicopters, Inc., Model SH-3H helicopters. (3) Croman Corporation Model SH-3H helicopters. (4) Sikorsky Aircraft Corporation Model S-61A, S-61D, S-61E, and S-61V helicopters. (5) Siller Helicopters Model CH-3E helicopters. (6) Siller Helicopters Model SH-3A helicopters.
Compliance
Comply with this AD within the compliance times specified, unless already done.
Required actions
Within 10 hours time-in-service (TIS) after the effective date of this AD, do the actions specified in paragraphs (g)(1) and (2) of this AD. (1) Create an external lift component history card or equivalent record for each IFWU assembly, part number (P/N) 61074-35000-041 through 61074-35000-063 inclusive. (2) Count and, at the end of each day's operations, record the number of external lift cycles (lift cycles) performed and the hours TIS for each IFWU assembly, P/N 61074-35000-041 through 61074-35000-063 inclusive. A “lift cycle” is defined as the lifting of an external load and subsequent release of the load. Record the lift cycles and hours TIS on the external lift component history card or equivalent record.
Unsafe condition
This AD was prompted by an accident in which the left and right input freewheel unit (IFWU) assembly on a helicopter slipped or disengaged, resulting in both engines overspeeding, engine shutdowns, and loss of engine power to the transmissions. The FAA is issuing this AD to address slipping of the main gearbox IFWU assembly, loss of engine power, and subsequent loss of control of the helicopter.
Affected ADs
None.
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The directive text above is reproduced from the Federal Register, a work of the United States government and in the public domain. The separation into applicability, compliance and required actions is TrackAD's.*1