AD 2013-14-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| engine | CFM | International | Airworthiness Directives; CFM International, S. A. Turbofan Engines |
Unsafe Condition
Corrosion of the delta-P valve in the hydro-mechanical unit (HMU) fuel control caused by exposure to type TS-1 fuel, leading to seizure of the HMU and potential failure of one or more engines and damage to the airplane.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Clean, inspect, and repair affected HMUs. Use paragraph 3.A(2) of CFM SB CFM56-5 S/B 73-0182, Revision 6, or CFM SB CFM56-5B S/B 73-0122, Revision 8, for the inspection. Overhaul is defined as HMU maintenance, including inspection, cleaning, or replacement of the HMU delta-P valve.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 4,000 hours from the effective date of the AD.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
CFM International, S.A. model CFM56-5 and CFM56-5B series turbofan engines.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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