AD 2018-17-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron | Various | Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters |
| aircraft | Bell | Helicopter Textron | Airworthiness Directives; Bell Helicopter Textron, Inc. (Bell) Helicopters |
Unsafe Condition
The engine oil and fuel check valves may have a condition induced during assembly that can cause the valve body to crack, resulting in oil or fuel leakage. This condition could result in loss of lubrication or fuel to the engine, failure of the engine or a fire, 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 the engine oil and fuel check valves within 25 hours time-in-service (TIS). Prohibit installing on any helicopter a check valve P/N 209-062-520-001 or P/N 209-062-607-001 that was manufactured by Circor Aerospace, marked "Circle Seal" and marked with a manufacturing date code of "10/11" (October 2011) through "03/15" (March 2015), except if "TQL" is marked next to the manufacturing date code.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 25 hours time-in-service (TIS)
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Affected Aircraft
Bell Model 212 and 412 helicopters with an engine oil or fuel check valve part number (P/N) 209-062-520-001 or P/N 209-062-607-001 that was manufactured by Circor Aerospace, marked "Circle Seal" and marked with a manufacturing date code of "10/11" (October 2011) through "03/15" (March 2015) installed.
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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