AD 86-17-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 212 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. Model 212 Helicopters |
Unsafe Condition
Failure of the tail rotor control due to cracks in the T/R trunnion housing P/N 212-011-716-1 or axial play in the T/R trunnion, or presence of excess balance washers.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 25 hours' time in service after receipt, visually inspect the T/R hub assembly P/N 212-011-701-3 per Part 1 of BHTI ASB 212-86-39. If cracks, axial play, or excess washers exist, comply with Part II of the ASB before further flight. Repeat inspection every 25 hours until paragraph (b) is done. Within 150 hours' time in service or 60 days after AD issue, whichever comes first, remove and inspect the T/R hub assembly's trunnion bearing housing P/N 212-011-716-1 per Part II of the ASB; replace housings with end web thickness ≤0.059 inch.
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Compliance Time
Within 25 hours' time in service after receipt of this AD for initial inspection; within 150 hours' time in service or within 60 days after the issue date of this AD, whichever occurs first for paragraph (b).
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 212 helicopters with serial numbers 30501 through 30999, 31101 through 31273, 31275; 32101 through 32142 and 32201 through 32262, equipped with T/R hub and blade assembly P/N 212-011-701-001.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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