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Airworthiness Directive 2012-21008

one-time
AD 2012-21008 · 2012-08-27 · turbine engine

Airworthiness Directives; Honeywell International Inc. Turbofan Engines

What this AD requires

We are adopting a new airworthiness directive (AD) for all Honeywell International Inc. TFE731-20R, -20AR, -20BR, -40, -40AR, - 40R, -50R, and -60 turbofan engines. This AD was prompted by a report of a quality escape of about 8,000 2nd stage low-pressure turbine (LPT2) rotor blades, manufactured by Honeywell Chihuahua Manufacturing Operation since 2009. This AD requires removing and inspecting certain LPT2 rotor blades. We are issuing this AD to correct an unsafe condition caused by these blades installed on these engines.

Which aircraft AD 2012-21008 applies to

MakesHoneywell International Inc.
ModelsTFE731-20R, TFE731-20AR, TFE731-20BR, TFE731-40, TFE731-40AR, TFE731-40R, TFE731-50R, TFE731-60, TFE731
Part-conditional — 3060608-2, 3060608-3, 3060608-5, 3075424-2, 3075424-3.

Applies to engines with an engine model/serial number listed in Table 4 of Honeywell SB TFE731-72-5221 Rev 0 (11/11/2010), OR with LPT2 rotor assembly P/N 3060608-2/-3/-5 that had LPT2 rotor blades P/N 3075424-2 replaced 3/2009-9/2010 inclusive or P/N 3075424-3 replaced 7/2010-9/2010 inclusive.

Whether AD 2012-21008 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 2012-21008 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.