AD 2014-13-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Boeing Defense & Space Group | Various | Airworthiness Directives; Columbia Helicopters, Inc. (Type Certificate Previously Held by Boeing Defense & Space Group) Helicopters |
| aircraft | Boeing | Various | Airworthiness Directives; Columbia Helicopters, Inc. (Type Certificate Previously Held by Boeing Defense & Space Group) Helicopters |
Unsafe Condition
Fatigue failure of the structure surrounding the aft pylon following an aft rotor blade failure, leading to blade separation, vibration, and overload of the aft pylon structure, resulting in pylon departure and loss of control.
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Required Actions
Visually and tap inspect each rotor blade for defects, damage, or disbond; repair or replace blades as necessary. Dye-penetrant inspect the aft pylon structure at STA 534 and 594 for cracks; repair or replace the pylon if a crack is found.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time-in-service (TIS) for initial inspections, and thereafter at intervals not to exceed 100 hours TIS.
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Affected Aircraft
Columbia Helicopters, Inc. Model 234 helicopters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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