AD 2012-11-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | Honeywell | International | Airworthiness Directives; Honeywell International, Inc. Turbofan Engines |
Unsafe Condition
Two reports of engines experiencing uncontained release of low-pressure (LP) turbine blades. This AD aims to prevent LP turbine overspeed leading to uncontained release of the LP turbine blades and damage to the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Perform an initial check of the overspeed trip system within 30 operating hours after the effective date. For ALF502L-2C engines, conduct repetitive checks at 100-hour intervals. For ALF502R-3, ALF502R-3A, ALF502R-5, LF507-1H, and LF507-1F engines, perform repetitive checks once every flight day. Detailed functional tests are required if the engine does not shut down during the checks.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 operating hours after the effective date
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Affected Aircraft
Honeywell International, Inc. ALF502L-2C; ALF502R-3; ALF502R-3A; ALF502R-5; LF507-1F; and LF507-1H turbofan engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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