Airworthiness Directive 2001-25-08
one-timeAirworthiness Directives; Sikorsky Model S-70A and S-70C Helicopters
What this AD requires
This amendment adopts a new airworthiness directive (AD) for Sikorsky Model S-70A and S-70C helicopters. This action requires certain inspections of each main landing gear drag beam (beam) for a crack and removing any cracked beam before further flight. This action also requires reducing the torque of the jackpad mounting bolt retention nut (nut) of each beam. This amendment is prompted by failure of a beam due to stress corrosion resulting from sustained tensile stress due partly to excessive torque of the nut. The actions specified in this AD are intended to prevent excessive torque of the nut, failure of a beam, and subsequent loss of control of the helicopter during takeoff or landing.
Which aircraft AD 2001-25-08 applies to
Applies only to specific helicopters by serial number, not a continuous range: Model S-70A S/N 700029, 701129, 701322, 701325, 701327, 701329, 701331, 701333, 701592-701595, 701613-701614, 701825, 701835, 702127, 702129; Model S-70C S/N 70583, 70785, 70788, 70792-70794, 70797-70800, 70811-70813, 70830-70831, 70836-70837, 70848, 70855-70856, 70867-70868, 70879, 70884, 70892, 70910, 70918, 70927-70929, 70949-70951, 70954, 70957-70959, 70965-70966, 701029.
Whether AD 2001-25-08 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.
How AD compliance is recorded
A valid compliance record (14 CFR 43.9) states:
Tailplate reads a tail number’s logbooks and matches every applicable AD — including this one — to its compliance evidence, with recurring next-due dates computed.
Look up a tail number →Read the full directive (Federal Register)Applicability is derived from the FAA directive corpus and is advisory, not a legal airworthiness determination. Compliance is established only from an aircraft’s actual records.