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Airworthiness Directive 2009-25-08

one-time
Official AD 2009-25-08 · FR doc E9-29427 · 2009-12-11 · airframe

Airworthiness Directives; Bell Helicopter Textron Canada (BHTC) Model 407 and Model 427 Helicopters

What this AD requires

We are adopting a new airworthiness directive (AD) for the BHTC Model 407 and Model 427 helicopters. This AD results from mandatory continuing airworthiness information (MCAI) ADs issued by the aviation authority of Canada. The MCAI ADs state that some hydraulic pump driveshaft assemblies may have been delivered with a missing internal plug or fastening rivet. This condition, if not corrected, could result in a loss of hydraulic pressure and subsequent loss of control of the helicopter.

Which aircraft AD 2009-25-08 applies to

MakesBell
Models407, 427
Serial-conditional — narrows to serials 53000–53408, 53421–53459, 56001–56046.
Part-conditional — 407-340-107-101, 407-340-108-101, 406-040-072-105.

Applies to Model 407 helicopters S/N 53000-53408 and 53421-53459, and Model 427 helicopters S/N 56001-56046. Does not apply to helicopters with hydraulic pump input shaft P/N 407-340-107-101 and interconnect adapter P/N 407-340-108-101 installed (a direct replacement for the affected hydraulic pump driveshaft assembly, P/N 406-040-072-105).

Whether AD 2009-25-08 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 2009-25-08 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.