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Airworthiness Directive 99-11-08

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Official AD 99-11-08 · FR doc 99-13484 · 1999-05-28 · turbine engine

Airworthiness Directives; General Electric Aircraft Engines CF34 Series Turbofan Engines

What this AD requires

This amendment adopts a new airworthiness directive (AD), applicable to General Electric Aircraft Engines (GE) CF34 series turbofan engines, that 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 is prompted by reports of rapid uncommanded engine acceleration events. 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 99-11-08 applies to

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

Installed on but not limited to Bombardier, Inc. Canadair airplane models CL-600-2A12, -2B16, and -2B19.

Whether AD 99-11-08 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 99-11-08 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.