AD 2016-20-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters |
| aircraft | Bell | 427 and Model 429 | Airworthiness Directives; Bell Helicopter Textron Canada Limited (Bell) Helicopters |
Unsafe Condition
Cracked or leaking engine and transmission oil check valves, part number 209-062-520-001, manufactured by Circor Aerospace, could result in loss of lubrication to the engine or transmission, leading to failure of the engine or transmission 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
Replace all transmission and engine oil check valves within 25 hours time-in-service (TIS). Prohibit installing check valves P/N 209-062-520-001 manufactured by Circor Aerospace, marked 'Circle Seal,' and with manufacturing date codes from '10/11' (October 2011) through '03/15' (March 2015).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time-in-service (TIS)
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Bell Model 427 and Model 429 helicopters, specifically those with engine and transmission oil check valves P/N 209-062-520-001 manufactured by Circor Aerospace between October 2011 and March 2015.
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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