AD 2004-25-16
Unsafe Condition
Failure of the fuel regulator shutoff valve, which could result in fuel leakage in aircraft with these combustion heaters, leading to an aircraft fire.
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Required Actions
Repetitively inspect the fuel regulator shutoff valve (visually or by pressure test) for fuel leakage. If fuel leakage is found, replace the fuel regulator shutoff valve with an improved design replacement part with a manufacture date code of 02/02 or later. Alternatively, disable the heater as an alternative method of compliance.
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Compliance Time
Within 50 flight hours after the effective date of this AD.
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Affected Aircraft
Kelly Aerospace Power Systems Part Number (P/N) 14D11, A14D11, B14D11, C14D11, 23D04, A23D04, B23D04, C23D04, or P23D04 Fuel Regulator Shutoff Valves used with Kelly Aerospace B1500, B2030, B2500, B3040, B3500, B4050, or B4500 B-Series combustion heaters.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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