AD 85-26-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Bell Helicopter Textron Canada Limited | 206A | BELL HELICOPTER TEXTRON, INC. Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206A-1 (OH-58A) | BELL HELICOPTER TEXTRON, INC. Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B | BELL HELICOPTER TEXTRON, INC. Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206B-1 | BELL HELICOPTER TEXTRON, INC. Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L | BELL HELICOPTER TEXTRON, INC. Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-1 | BELL HELICOPTER TEXTRON, INC. Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
| aircraft | Bell Helicopter Textron Canada Limited | 206L-3 | BELL HELICOPTER TEXTRON, INC. Model 206A, 206A-1, 206B, 206B-1, 206L, 206L-1, and 206L-3 Helicopters |
Unsafe Condition
Possible loss of the tail rotor tip block and resulting tail rotor imbalance which could lead to tail rotor gearbox and stud failure and subsequent separation of the tail rotor gearbox from the helicopter tailboom.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Within 7 days after the effective date, and every 7 days thereafter, visually check tail rotor blades (P/N 206-016-201-001, -103, -107) for corroded/missing rivet heads, rivet heads pulled through the skin shell, voids/separations between skin shell and tip block, and tip block displacement. Within 100 hours time in service after the effective date, and every 100 hours thereafter, inspect blades for corrosion/missing rivets, replace corroded/missing rivets, check for pulled rivet heads requiring blade replacement, inspect voids/gaps with specific limits, seal acceptable voids, and replace blades exceeding limits. Within 30 days after the effective date, replace five aluminum rivets with titanium rivets (P/N CSR903B4-14) and special washers (P/N 206-016-213-101) per specified service bulletins. Record checks and discrepancies in maintenance logs as required.
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Compliance Time
Within the next 7 days after the effective date of this AD, and thereafter at intervals not to exceed 7 days; within the next 100 hours time in service after the effective date, and thereafter at intervals not to exceed 100 hours time in service; within the next 30 days after the effective date.
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Affected Aircraft
Bell Helicopter Textron, Inc. Model 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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