AD 2013-22-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron Canada (Bell) Helicopters |
| aircraft | Bell | 206L-4 and 407 | Airworthiness Directives; Bell Helicopter Textron Canada (Bell) Helicopters |
Unsafe Condition
Certain caps being manufactured without a lubrication channel to allow oil flow into the aft bearing support assembly, which could result in failure of the freewheel unit 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
Within 50 hours time-in-service (TIS): remove and disassemble each freewheel assembly; replace the sprag and retainer, output shaft, and aft seal; visually inspect the remaining freewheel part details for a missing channel; if the channel is missing, replace or rework the cap assembly and mark the letter 'R' at the end of the serial number on the cap assembly.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time-in-service (TIS)
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Model 206L-4 and 407 helicopters, with a freewheel aft bearing cap (part number 406-040-509-101) with a serial number prefix of 'A-' and Nos. 1833 through 1912, installed.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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