Is AD 2001-15-15 a recurring Airworthiness Directive?

Yes — AD 2001-15-15 requires a repetitive inspection every 9 months. Next-due depends on the aircraft's time in service.

Which aircraft does AD 2001-15-15 apply to?

AD 2001-15-15 applies to Boeing — models 747. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2001-15-15

recurring

Official AD 2001-15-15 · FR doc 01-18469 · 2001-07-31 · airframe

Airworthiness Directives; Boeing Model 747 Series Airplanes Powered By Pratt & Whitney JT9D-7 Series Engines

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to certain Boeing Model 747 series airplanes powered by Pratt & Whitney JT9D-7 series engines, that currently requires detailed visual inspections of the lugs on the bulkhead fitting of the rear engine mount, and corrective action, if necessary. The existing AD also specifies optional ultrasonic inspections, which, if accomplished, extend the repetitive interval for the required detailed visual inspections. This amendment requires accomplishment of the previously optional ultrasonic inspections and, for certain airplanes, rework of the bulkhead fitting of the rear engine mount. The actions specified by this AD are intended to detect and correct bushing migration, corrosion, or cracking of the lugs on the bulkhead fitting of the rear engine mount, which could result in fracture of the lugs and separation of the engine from the airplane. This action is intended to address the identified unsafe condition.

Repetitive inspection. Re-inspect every 9 months. The next-due date/hours depend on this aircraft’s time in service — a records report computes it from the logbooks.

Which aircraft AD 2001-15-15 applies to

MakesBoeing

Models747

Restates AD 2000-18-01; applies to Boeing 747 series airplanes for detection/correction of bushing migration, corrosion, or cracking of the lugs on the bulkhead fitting of the rear engine mount, per Boeing SB 747-54A2200 (original or Rev 1); repetitive inspection interval and compliance timing keyed to total flight cycles/years since manufacture rather than a specific derivative model.

Whether AD 2001-15-15 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 2001-15-15 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.