Is AD 99-29740 a recurring Airworthiness Directive?

No — AD 99-29740 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 99-29740 apply to?

AD 99-29740 applies to General Electric — models CF34-1A, CF34-3A, CF34-3A1, CF34-3A2, CF34-3B, CF34-3B1, CF34. Serial/part conditions may narrow it to specific aircraft.

Airworthiness Directive 99-29740

one-time

AD 99-29740 · 1999-11-19 · turbine engine

Airworthiness Directives; General Electric Aircraft Engines CF34 Series Turbofan Engines

What this AD requires

This amendment supersedes an existing airworthiness directive (AD), applicable to General Electric Aircraft Engines (GE) CF34 series turbofan engines, that currently requires installation of a main fuel control (MFC) that incorporates a flange vent groove and installation of an MFC with improved overspeed protection. This amendment requires replacement of Buna-N O-rings with Viton O-rings or a new location of the vent groove on the MFC mounting flange, or installation of an MFC with improved overspeed protection. This amendment is prompted by the determination that the location of the reworked vent groove was ineffective, and that replacement of Buna-N preformed packings with Viton preformed packings will alleviate the unsafe condition. The actions specified by this AD are intended to prevent uncommanded engine accelerations, which could result in an engine overspeed, uncontained engine failure, and damage to the airplane.

Which aircraft AD 99-29740 applies to

MakesGeneral Electric

ModelsCF34-1A, CF34-3A, CF34-3A1, CF34-3A2, CF34-3B, CF34-3B1, CF34

Whether AD 99-29740 actually applies to your aircraft (by serial and installed parts) and whether it’s already complied with comes from that aircraft’s records.

Supersession

Supersedes AD 99-11-08.

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 99-29740 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.