Is AD 00-28437 a recurring Airworthiness Directive?

No — AD 00-28437 is a one-time directive. Verify it was complied with in the aircraft's records.

Airworthiness Directive 00-28437

Q: Which aircraft does AD 00-28437 apply to?

AD 00-28437 applies to Bell Helicopter Textron Inc., Southwest Florida Aviation — models HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H. Serial/part conditions may narrow it to specific aircraft.

one-time

AD 00-28437 · 2000-11-07 · airframe

Airworthiness Directives; Bell Helicopter Textron Inc.-Manufactured Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and UH-1P; and Southwest Florida Aviation SW204, SW204HP, SW205, and SW205A-1 Helicopters

What this AD requires

This amendment revises an existing airworthiness directive (AD) that applies to Model HH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, and UH-1P; and Southwest Florida Aviation SW204, SW204HP, SW205, and SW205A-1 helicopters, manufactured by Bell Helicopter Textron Inc. (BHTI) for the Armed Forces of the United States, and requires removing and replacing certain main rotor mast (mast) assemblies. This amendment corrects a part number that was published incorrectly in the existing AD. This amendment is prompted by the discovery of that error. The actions specified by this AD are intended to prevent fatigue failure of the mast and subsequent loss of control of the helicopter.

Which aircraft AD 00-28437 applies to

MakesBell Helicopter Textron Inc.Southwest Florida Aviation

ModelsHH-1K, TH-1F, TH-1L, UH-1A, UH-1B, UH-1E, UH-1F, UH-1H, UH-1L, UH-1P, SW204, SW204HP, SW205, SW205A-1

Part-conditional — 204-011-450-001, 204-011-450-005.

Applies to helicopters manufactured by Bell Helicopter Textron Inc. (BHTI) for the Armed Forces of the United States (and Southwest Florida Aviation SW204/SW204HP/SW205/SW205A-1 variants), certificated in any category, with a main rotor mast assembly, P/N 204-011-450-001 or -005, installed. Neither P/N is eligible for installation on any affected helicopter; must be replaced with an airworthy mast assembly within 25 hours TIS.

Whether AD 00-28437 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 00-28437 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.