Is AD 2001-04-16 a recurring Airworthiness Directive?

No — AD 2001-04-16 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2001-04-16 apply to?

AD 2001-04-16 applies to General Electric Company — models CF6-50, CF6. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 2001-04-16

one-time

Official AD 2001-04-16 · FR doc 01-4939 · 2001-03-06 · turbine engine

Airworthiness Directives; General Electric Company CF6-50 Series Turbofan Engines

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to General Electric Company (GE) CF6-50 series turbofan engines. That AD currently requires visual inspection of the stage 2 low pressure turbine (LPT) nozzle lock assemblies, and replacement of the borescope plug with a new design plug. This amendment is prompted by a report of an uncontained engine failure on an engine that had complied with the current AD. This amendment requires additional inspections and provides interim and terminating corrective actions. The actions specified in this AD are intended to detect cracked, loose or missing stage 2 LPT nozzle lock assembly studs that could lead to failure of the locks, nozzle segment rotation, LPT case machining, and subsequent uncontained failure of the engine. The actions also provide for modifications of nozzle lock assemblies if the nozzle lock studs are found cracked, loose, or missing.

Which aircraft AD 2001-04-16 applies to

MakesGeneral Electric Company

ModelsCF6-50, CF6

Part-conditional — 2083M99P01, 305-381-303-0, 2110M79P01.

Requires installation of a stage 2 LPT solid borescope inspection plug, part number 2083M99P01 (or alternate part number 305-381-303-0 or 2110M79P01), unless GE ASB CF6-50 72-A1201 (or Revision 1) has already been accomplished; repetitive visual inspection intervals for stage 2 nozzle lock assemblies differ depending on whether they are Rene 41 or Waspalloy and on accumulated hours time-since-new.

Whether AD 2001-04-16 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 2001-04-16 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.