Airworthiness Directives; Kelly Aerospace Power Systems Part Number (P/N) 14D11, A14D11, B14D11, C14D11, 23D04, A23D04, B23D04, C23D04, or P23D04 Fuel Regulator Shutoff Valves (Formerly Owned by ElectroSystems, JanAero Devices, Janitrol, C&D, FL Aerospace, and Midland-Ross Corporation)

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The FAA is adopting a new airworthiness directive (AD) to supersede AD 2001-17-13, which applies to aircraft equipped with a Kelly Aerospace Power Systems (Kelly Aerospace) part number (P/N) 14D11, A14D11, B14D11, C14D11, 23D04, A23D04, B23D04, C23D04, or P23D04 fuel regulator shutoff valve used with Kelly Aerospace B1500, B2030, B2500, B3040, B3500, B4050, or B4500 B-Series combustion heaters. AD 2001-17-13 requires you to visually inspect or pressure test the fuel regulator shutoff valves for leaks and replace the fuel regulator shutoff valve if leaks are found. This AD is the result of continued reports of fuel regulator shutoff valve problems and the manufacturer revising the service information to modify the pressure test procedures and to specify installing improved design replacement parts. This AD retains the actions required in AD 2001-17-13, makes the inspection repetitive, and requires installing improved design replacement parts. We are issuing this AD to prevent failure of the fuel regulator shutoff valve, which could result in fuel leakage in aircraft with these combustion heaters. This failure could result in an aircraft fire.