AD 90-03-09
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron, Inc. | 205A | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. BHTI Model 205A, 205A-1, 212 and 412 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 205A-1 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. BHTI Model 205A, 205A-1, 212 and 412 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 212 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. BHTI Model 205A, 205A-1, 212 and 412 Helicopters |
| aircraft | Bell Helicopter Textron, Inc. | 412 | Airworthiness Directives; BELL HELICOPTER TEXTRON, INC. BHTI Model 205A, 205A-1, 212 and 412 Helicopters |
Unsafe Condition
Failure of the tail rotor and subsequent loss of control of the helicopter due to cracks in the end web of the T/R trunnion bearing housing assembly, P/N 212-011-716-1, or end web thickness less than 0.059 inches.
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Required Actions
Visually inspect the T/R trunnion bearing housing assembly for cracks every 20 or 25 hours' time in service (depending on model) until replacement is accomplished. Measure end web thickness and replace housing if it is 0.059 inches or less. Replace cracked parts before further flight. Accomplish via Bell ASBs 412-86-25, 205-86-24, or 212-86-39 as applicable.
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Compliance Time
Within the next 20/25 hours' time in service or 150 hours/60 days after February 13, 1990, whichever comes first.
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Affected Aircraft
Bell Helicopter Textron, Inc. Models 205A (with P/N 212-704-129-101), 205A-1 (with P/N 212-704-129-101), 212 (S/N 30501-30999, 31101-31273, 31275, 32101-32142, 32201-32262 with P/N 212-011-701-001), and 412 (S/N 33001-33118, 33120, 33121) helicopters with specified T/R hub and blade assemblies.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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