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Airworthiness Directive 2002-21-07

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Official AD 2002-21-07 · FR doc 02-26590 · 2002-10-21 · airframe

Airworthiness Directives; Sikorsky Aircraft Corporation Model S-76A, S-76B and S-76C Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) for the specified Sikorsky Aircraft Corporation (Sikorsky) model helicopters that requires removing and inspecting each main rotor spindle attachment bolt (bolt) to ensure that the correct bolts are installed. This amendment is prompted by the discovery of improper bolts installed on a helicopter during its production. The actions specified by this AD are intended to detect installation of incorrect bolts, which could result in reduced hub or bolt fatigue life, separation of the main rotor blade at the spindle attachment, and subsequent loss of control of the helicopter.

Which aircraft AD 2002-21-07 applies to

MakesSikorsky

Main rotor spindle attachment bolt length inspection (target 1.181 +/-0.015 in, 40 bolts/helicopter) and hub/bolt replacement criteria per Sikorsky ASB No. 76-65-52(321); the '76-65' SB numbering suggests the S-76 model family but no explicit model name is present in the extracted text.

Whether AD 2002-21-07 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 2002-21-07 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.