AD 98-18-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 214B | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214B-1 | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 214ST | Airworthiness Directives; Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST Helicopters |
Unsafe Condition
Fatigue failure of the main rotor trunnion, which could result in loss of the main rotor and subsequent loss of control of the helicopter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Create a component history card or equivalent record for the trunnion. Determine and record the accumulated Retirement Index Number (RIN) to-date by multiplying flight hours or high-power events by specified factors. Maintain daily RIN counts based on takeoffs and external load lifts, and remove the trunnion when RIN reaches 120,000.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Required within 25 hours time-in-service (TIS) after the effective date of this AD, unless accomplished previously.
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 214B, 214B-1, and 214ST helicopters with main rotor trunnion part number 214-010-230-101 installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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