AD 2018-02-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Various | Restricted Category | Airworthiness Directives; Various Restricted Category Helicopters |
Unsafe Condition
A crack, corrosion, an edge void, loose or damaged adhesive squeeze-out, or an edge delamination in the grip plate and doublers at the blade retention bolt hole of a main rotor blade could lead to failure of the blade and subsequent loss of helicopter control.
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Required Actions
Clean and visually inspect the main rotor blades, and depending on the outcome, repair or replace the blades. If a crack, corrosion, an edge void, loose or damaged adhesive squeeze-out, or an edge delamination is found, repair the blade or replace it with an airworthy blade before further flight. Report information about any cracks found during the inspection to the FAA within 10 days.
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Compliance Time
Within 25 hours time-in-service (TIS) or 2 weeks, whichever occurs first, and thereafter at intervals not to exceed 25 hours TIS or 2 weeks, whichever occurs first.
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Affected Aircraft
Model TH-1F, UH-1B, UH-1F, UH-1H, and UH-1P helicopters with a Helicopter Technology Company (HTC) main rotor blade part number (P/N) 204P2100-101 installed.
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Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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