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Airworthiness Directive 99-21-01

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Official AD 99-21-01 · FR doc 99-25598 · 1999-10-04 · appliance

Airworthiness Directives; Eurocopter France Model SA-360C, SA- 365C, C1, and C2 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) applicable to Eurocopter France Model SA-360C, SA-365C, C1, and C2 helicopters. This action requires replacing certain electrical modules with airworthy electrical modules. This amendment is prompted by the discovery of several defective electrical modules. This condition if not corrected could result in loss of electrical continuity, which could cause loss of critical rotorcraft electrical systems and subsequent loss of control of the helicopter.

Which aircraft AD 99-21-01 applies to

MakesEurocopter

Applies to helicopters with a "CONNECTRAL" green electrical module lacking a white dot on the face, with a manufacturing code of 95/16 through 96/21; such modules must be removed and replaced with an airworthy electrical module, per Eurocopter France Service Bulletin No. 01.37, dated May 28, 1998. Specific model not stated in captured applicability text.

Whether AD 99-21-01 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 99-21-01 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.