AD 2009-25-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron Canada (BHTC) Model 407 and Model 427 Helicopters |
| aircraft | Bell | Various | Airworthiness Directives; Bell Helicopter Textron Canada (BHTC) Model 407 and Model 427 Helicopters |
| aircraft | Aviat | Various | Airworthiness Directives; Bell Helicopter Textron Canada (BHTC) Model 407 and Model 427 Helicopters |
Unsafe Condition
Some hydraulic pump driveshaft assemblies, part number 406-040-072-105, may have been delivered with a missing internal plug or fastening rivet, which could result in a loss of hydraulic pressure 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
Inspect the hydraulic pump driveshaft assembly, part number 406-040-072-105, to determine the presence of the internal plug and the fastening rivet. If the internal plug or rivet is missing, install a replacement shaft and adapter.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 50 hours time-in-service
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Helicopter Textron Canada Model 407 helicopters, serial numbers 53000 through 53408, and 53421 through 53459; and Model 427 helicopters, serial numbers 56001 through 56046. Excludes helicopters with hydraulic pump input shaft, part number 407-340-107-101, and interconnect adapter, part number 407-340-108-101.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 4, 2026
Rights: U.S. Government Public Domain
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