03/27/1997. ONE TIME VISUAL INSPECTION AND REPLACEMENT OF CERTAIN P/N 4C3074 CRISSAIR, INC., CHECK VALVE INSTALLED IN POWER CONTROL MODULE ASSEMBLIES IN THE PORT MARKED `FLT CONT PUMP` ONLY FOR ALL CH-47D, MH-47D, AND MH-47E AIRCRAFT (THIS ITEM IS INCLUDED ON EM 0083) AMCOM. TB 1-1520-240-20-97.
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