AD 2013-20-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters |
| aircraft | Bell | 407 | Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters |
Unsafe Condition
Third stage turbine vibration, which could result in turbine failure, engine power loss, 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
Revise the Operating Limitations section of the Model 407 Rotorcraft Flight Manual. Remove placard part number 230-075-213-105, if installed. Install placard P/N 230-075-213-111, or equivalent, directly below the NR/NP dual tachometer.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 30 days
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Affected Aircraft
Bell Model 407 helicopters, serial numbers 53000 through 53644, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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