AD 2025-15-02
Unsafe Condition
Cracks found in the main rotor (M/R) transmission drive shaft (drive shaft) could result in separation of the M/R drive shaft and M/R blades from the helicopter, leading to loss of control.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect certain M/R drive shafts for cracks. Prohibit installing certain M/R drive shafts unless the inspection is completed. Prohibit using certain paint strippers.
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Compliance Time
Within 4 years of the effective date of this AD or at the next M/R transmission assembly overhaul inspection after the effective date, whichever comes first.
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Affected Aircraft
Siam Hiller Holdings, Inc., Model UH-12E (Army OH-23G and H-23F) and UH-12E-L helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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