Is AD 2004-23-15 a recurring Airworthiness Directive?

No — AD 2004-23-15 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2004-23-15 apply to?

AD 2004-23-15 applies to Md Helicopters — models MD900, 900. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2004-23-15

one-time

Official AD 2004-23-15 · FR doc 04-25542 · 2004-11-22 · airframe

Airworthiness Directives; MD Helicopters, Inc. Model MD900 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) for the MD Helicopters, Inc. (MDHI) Model MD900 helicopters. This action requires reducing the life limit of certain Notar fan system tension- torsion (TT) straps. This action also requires, at a specified time interval, removing each affected TT strap from the helicopter, doing a visual and x-ray inspection, and replacing any unairworthy part before further flight. Reporting the discovery of any unairworthy TT strap is also required. This amendment is prompted by two recent in-flight TT strap failures. The actions specified in this AD are intended to prevent failure of a TT strap resulting in loss of directional control and subsequent loss of control of the helicopter.

Which aircraft AD 2004-23-15 applies to

MakesMd Helicopters

ModelsMD900, 900

Part-conditional — 900R3442009-103, 900R6442009-103, 900R3442009-101, 500N5311-5.

Applies only if a Notar fan system tension-torsion (TT) strap with one of the listed part numbers is installed.

Whether AD 2004-23-15 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 2004-23-15 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.