Is AD 2009-07-12 a recurring Airworthiness Directive?

No — AD 2009-07-12 is a one-time directive. Verify it was complied with in the aircraft's records.

Which aircraft does AD 2009-07-12 apply to?

AD 2009-07-12 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 2009-07-12

one-time

Official AD 2009-07-12 · FR doc E9-7417 · 2009-04-02 · turbine engine

Airworthiness Directives; General Electric Company CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 Turbofan Engines

What this AD requires

The FAA is adopting a new airworthiness directive (AD) for General Electric Company (GE) CF34-1A, -3A, -3A1, -3A2, -3B, and -3B1 turbofan engines with high-pressure (HP) rotor 4-step air balance piston stationary seals (4-step seals), part numbers (P/Ns) 4923T54G01, 6019T90G03, 6037T99G01, 6037T99G02, and 6037T99G03, installed. This AD requires removing the 4-step seals and incorporating an 8-step seal at the next piece-part exposure. This AD results from the investigation of an airplane accident. Both engines experienced high-altitude flameout. Rotation of the HP rotors was not maintained during descent and the engines could not be restarted. We are issuing this AD to prevent the inability to restart both engines after flameout due to excessive friction of the 4-step seal, which could result in subsequent forced landing of the airplane.

Which aircraft AD 2009-07-12 applies to

MakesGeneral Electric

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

Part-conditional — 4923T54G01, 6019T90G03, 6037T99G01, 6037T99G02, 6037T99G03.

Applies only when a high-pressure (HP) rotor 4-step air balance piston stationary seal with one of the listed part numbers is installed. These engines are installed on, but not limited to, Bombardier CL-600-2A12, -2B16, and -2B19 airplane models.

Whether AD 2009-07-12 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 2009-07-12 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.