Airworthiness Directive · Amendment 39-19636 · Bell Helicopter Textron, Inc. (Bell) Helicopters
Bell Helicopter Textron, Inc. (Bell) Helicopters
This AD applies to Bell Model 212, 412, 412CF, and 412EP helicopters, certificated in any category, with an engine oil check valve part number (P/N) 209-062-520-001 or fuel check valve P/N 209-062-607-001 manufactured by Circor Aerospace, marked “Circle Seal” and with a manufacturing date code of “10/11” (October 2011) through “03/15” (March 2015), except a check valve marked “TQL” next to the manufacturing date code, installed.
We are superseding Airworthiness Directive (AD) 2018-17-01 for Bell Model 212, 412, 412CF, and 412EP helicopters. AD 2018-17-01 required replacing certain oil and fuel check valves and prohibited installing these valves on any helicopter. This AD retains the requirements of AD 2018-17-01 but expands those requirements for all model helicopters. This AD was prompted by the discovery that we omitted a helicopter model from one of the required actions. We are issuing this AD to address the unsafe condition on these products.
(1) Within 25 hours time-in-service, replace each fuel check valve and each engine oil check valve.
(2) After the effective date of this AD, do not install on any helicopter a check valve P/N 209-062-520-001 or P/N 209-062-607-001 manufactured by Circor Aerospace, marked “Circle Seal” and with a manufacturing date code of “10/11” (October 2011) through “03/15” (March 2015), except for a check valve marked “TQL” next to the manufacturing date code.
The aircraft, engines and makers this AD names, by the model designations in its text. A model listed here may still be outside the AD's serial ranges.
