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Airworthiness Directive 95-30771

recurring
AD 95-30771 · 1995-12-20 · airframe

Airworthiness Directives; Sikorsky Aircraft-manufactured Model CH-34A, CH-34C, H-34A, HH-34J, HSS-1, HSS-1N, HUS-1, SH-34J, UH-34D, UH-34E, and UH-34J Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) that is applicable to Sikorsky Aircraft-manufactured Model CH-34A, CH-34C, H- 34A, HH-34J, HSS-1, HSS-1N, HUS-1, SH-34J, UH-34D, UH-34E, and UH-34J helicopters. This action requires initial and repetitive magnetic particle inspections of the main rotor shaft (shaft) for cracks, and defines power limitations for certain helicopter operations. This amendment is prompted by a recent accident in which a shaft failed, resulting in loss of power. Subsequent inspections on other aircraft of the same type revealed cracks in four additional shafts. The actions specified in this AD are intended to prevent failure of the shaft, loss of power to the rotor system, and subsequent loss of control of the helicopter.

Repetitive inspection. Re-inspect. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 95-30771 applies to

MakesSikorsky Aircraft
Part-conditional — S1635-20059-2, S1635-20153, S1635-20154.

Determine max operational cycles-per-hour of main rotor shaft assembly P/N S1635-20059-2 (default 25/hr if unknown); if ever >=20 cycles/hr, inspect within 50 hrs TIS (unless done within last 200 hrs), then repeat MPI every 250 hrs TIS; if never exceeded 19 cycles/hr, inspect within 50 hrs TIS. Remove end plugs P/N S1635-20153 (upper) and S1635-20154 (lower) and conduct magnetic particle inspection per MIL-STD-1949/ASTM E-1444, per Sikorsky Alert SB 58B35-34 (helicopter model not explicitly stated; SB number suggests S-58 series, not confirmed).

Whether AD 95-30771 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:

Method of compliance — The specific action taken (inspected, replaced, modified) and to what revision.
Date — When the work was done.
Aircraft time — Total time in service / tach at compliance — how recurring next-due is computed.
Signature & certificate — The A&P/IA who returned it to service, with certificate number.
Is AD 95-30771 complied with on your aircraft?

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.