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Airworthiness Directive 2011-24-11

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Official AD 2011-24-11 · FR doc 2011-30575 · 2011-11-29 · turbine engine

Airworthiness Directives; Honeywell International Inc. Turbofan Engines

What this AD requires

We are adopting a new airworthiness directive (AD) for certain Honeywell International Inc. ALF502L-2C, ALF502R-3, ALF502R-3A, ALF502R-5, LF507-1F, and LF507-IH turbofan engines. This AD requires removing from service certain second stage high pressure compressor (HPC2) discs. This AD was prompted by a report of cracks found in an HPC2 disc during routine inspection. We are issuing this AD to prevent the affected discs from fracturing before reaching the currently published life limit. A disc fracture could result in an uncontained failure of the disc and damage to the airplane.

Which aircraft AD 2011-24-11 applies to

MakesHoneywell International Inc.
ModelsALF502L-2C, ALF502R-3, ALF502R-3A, ALF502R-5, LF507-1F, LF507-1H, ALF502, LF507
Part-conditional — 2-101-332-12.

Applies only when a second-stage high pressure compressor (HPC2) disc, P/N 2-101-332-12, with a serial number listed in Table 2 of Honeywell SB No. ALF/LF-72-1113 (dated September 16, 2011), is installed.

Whether AD 2011-24-11 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 2011-24-11 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.