Is AD 2001-25-02 a recurring Airworthiness Directive?

No — AD 2001-25-02 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2001-25-02 apply to?

AD 2001-25-02 applies to Enstrom — models TH-28, 480. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2001-25-02

one-time

Official AD 2001-25-02 · FR doc 01-30499 · 2001-12-11 · airframe

Airworthiness Directives; Enstrom Helicopter Corporation Model TH-28 and 480 Helicopters

What this AD requires

This amendment adopts a new airworthiness directive (AD) for Enstrom Helicopter Corporation (EHC) Model TH-28 and 480 helicopters. This AD requires establishing a life limit for certain upper and lower main rotor hub plates of 5000 hours time-in-service (TIS), creating a component history card or equivalent record, and replacing each main rotor hub plate (hub plate) having 5000 or more hours TIS with an airworthy hub plate. This AD is prompted by a recent reliability-based stress analysis that indicates a 5000-hour TIS life limit should be imposed on certain hub plates. The actions specified by this AD are intended to prevent failure of a hub plate, loss of control of the main rotor, and subsequent loss of control of the helicopter.

Which aircraft AD 2001-25-02 applies to

MakesEnstrom

ModelsTH-28, 480

Part-conditional — 28-14280-1, 28-14281-1.

Applies only when upper hub plate P/N 28-14280-1 and lower hub plate P/N 28-14281-1 are installed.

Whether AD 2001-25-02 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 2001-25-02 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.