Is AD 2004-06-04 a recurring Airworthiness Directive?

No — AD 2004-06-04 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2004-06-04 apply to?

AD 2004-06-04 applies to Sikorsky — models S-76A, S-76B, S-76C, S-76. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2004-06-04

one-time

Official AD 2004-06-04 · FR doc 04-6777 · 2004-03-31 · airframe

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

What this AD requires

This amendment adopts a new airworthiness directive (AD) for Sikorsky Aircraft Corporation (Sikorsky) Model S-76 A, B, and C helicopters with dual channel autopilot and dual inverters installed. This action requires a test to determine if the No. 1 inverter is wired to the DC essential bus, and if so, it requires modifying the wiring so that the No. 1 inverter is wired to the No. 2 DC primary bus and the No. 2 inverter is wired to the DC essential bus. If the wiring modification is required and is not performed before further flight, then revising the Rotorcraft Flight Manual (RFM) before further flight to limit the maximum instrument meteorological conditions (IMC) airspeed and installing a placard near the airspeed indicator is also required. The wiring modification is required within 30 days. This amendment is prompted by three incidents in which a No. 2 generator intermittent malfunction occurred and both autopilots disengaged. The actions specified in this AD are intended to prevent both autopilots from disengaging following a No. 2 DC generator failure, and subsequent loss of control of the helicopter during IMC operations.

Which aircraft AD 2004-06-04 applies to

MakesSikorsky

ModelsS-76A, S-76B, S-76C, S-76

Serial-conditional — narrows to serials 760267–760378, 760262–760507, 760383–760526.

Applies only to helicopters with a dual channel autopilot and dual inverters installed. Only the following serial-numbered helicopters were manufactured with this configuration: S-76A S/N 760267, 760268, 760270-760298, 760300-760302, 760304-760309, 760364, 760366, 760369-760371, 760373-760378; S-76B S/N 760262, 760269, 760299, 760303, 760310-760363, 760365, 760367, 760368, 760372, 760379-760382, 760387, 760391, 760393, 760395, 760399, 760403, 760404, 760409, 760410, 760413, 760414, 760416, 760425, 760427-760430, 762976(760433), 760437, 760439, 760441-760445, 760447-760452, 760454, 760455, 760458, 760462, 760465, 760507; S-76C S/N 760383-760386, 760388-760390, 760392, 760394, 760396-760398, 760400-760402, 760405-760408, 760411, 760412, 760415, 760417-760424, 760426, 760431, 760432, 760434-760436, 760438, 760440, 760446, 760453, 760456, 760457, 760459-760461, 760463, 760464, 760466-760506, 760508-760526.

Whether AD 2004-06-04 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 2004-06-04 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.