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Airworthiness Directive 2000-04-20

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Official AD 2000-04-20 · FR doc 00-4794 · 2000-03-01 · airframe

Airworthiness Directives; Bell Helicopter Textron Canada Model 407 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to Bell Helicopter Textron Canada (BHTC) Model 407 helicopters, that requires replacing a certain hydraulic relief valve (valve) with a different valve. This amendment is prompted by the discovery of a manufacturing defect in a valve. The actions specified by this AD are intended to prevent intermittent loss of hydraulic pressure to the flight controls and subsequent loss of control of the helicopter.

Which aircraft AD 2000-04-20 applies to

MakesBell
Models407
Part-conditional — 206-076-036-101, 206-076-036-105.

Remove hydraulic relief valve P/N 206-076-036-101 and replace with airworthy valve P/N 206-076-036-105 per Bell Alert SB 407-98-20 (model inferred from SB number prefix).

Whether AD 2000-04-20 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 2000-04-20 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.