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Airworthiness Directive 99-19-30

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Official AD 99-19-30 · FR doc 99-23959 · 1999-09-17 · airframe

Airworthiness Directives; Sikorsky Aircraft Corp. Model S76A, B, and C Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) applicable to Sikorsky Aircraft Corporation (Sikorsky) Model S-76A, B, and C helicopters. This action requires conducting a visual inspection to detect disbonding of the attachment angle between the tail gearbox forward fairing (fairing) and the pylon and replacing or repairing the attachment angles as necessary. This amendment is prompted by incidents, two in flight and eight on the ground, of fairing bonding failures. The actions specified in this AD are intended to prevent separation of the fairing, damage to the tail rotor blades, and subsequent loss of control of the helicopter.

Which aircraft AD 99-19-30 applies to

MakesSikorsky Aircraft Corp.

Applies to helicopters with a tail gearbox forward fairing attachment angle. Visual inspection for disbond at 50 hr TIS initially, then every 1,500 hr TIS thereafter; if disbond area >=1.0 sq in, repair or replace the attachment angle, per Sikorsky Aircraft Corp. Alert Service Bulletin 76-55-16, dated May 12, 1999. Specific model not explicitly stated in captured applicability text (Alert SB number prefix suggests S-76 series, not confirmed by name).

Whether AD 99-19-30 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 99-19-30 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.