AD 2004-25-16 R1: Regarding B-Series Combustion Heaters

The FAA is revising Airworthiness Directive (AD) 2004-25-16,
which applies to aircraft equipped with a fuel regulator shutoff valve
part number (P/N) 14D11, A14D11, B14D11, C14D11, 23D04, A23D04, B23D04,
C23D04, or P23D04 used with B1500, B2030, B2500, B3040, B3500, B4050,
or B4500 B-Series combustion heaters.

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