AD 78-11-02 R1
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | Airworthiness Directives; Bell Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206A-1 (OH-58A) | Airworthiness Directives; Bell Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | Airworthiness Directives; Bell Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B-1 | Airworthiness Directives; Bell Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L | Airworthiness Directives; Bell Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-1 | Airworthiness Directives; Bell Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-3 | Airworthiness Directives; Bell Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
Unsafe Condition
The tension-torsion rotor blade straps (P/N 206-010-105-3, 206-010-105-5, and 206-011-127-1) may fail due to fatigue cracking, leading to main/rotor blades departing the helicopter.
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Required Actions
Remove existing straps with specified part numbers and associated inboard fittings. Install replacement straps (P/N 206-011-147-1/-5/-3/-7) and new inboard fittings (P/N 206-011-140-1) per maintenance instructions. Reduce retirement time for old straps to 600 hours time-in-service and retire all by January 1, 1989. Replace straps within compliance timeframe based on their current time-in-service.
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Compliance Time
Within the next 6 calendar months after effective date (December 15, 1988), unless already accomplished. Straps with <550 hours must act by attaining 600 hours or January 1, 1979. Straps with ≥550 hours must act within 50 hours or January 1, 1979.
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Affected Aircraft
Bell Helicopter Textron Canada Limited Models 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 helicopters certificated in any category.
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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