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8-4-40.  Power Deterioration
CHAPTER  9 EMERGENCY PROCEDURES

TM-1-1520-240-10 Army CH-47D Heilcopter (EIC:RCD) Manual
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TM  1-1520-240-10            8-4-5/(8-4-6 blank) operating in these conditions, should result in the pres- ervation of rated engine power. 8-4-41.  Hovering. Hovering over salt water at altitudes that cause concen- trated spray into the engine inlets results in gradual pow- er deterioration and eventual reduction of compressor stall  margin.  Operation  in  these  conditions  should  be avoided  or  minimized.  The  following  procedures  are grouped according to wind conditions. Maximum hover- ing altitude, consistent with safety and mission accom- plishment, is recommended to reduce possibility of salt spray  ingestion.  Prolonged  hovering  over  salt  water which results in spray ingestion, indicated by spray on the windshield, must be avoided. The amount of spray observed on the windshield is usually the best indication of spray ingestion into the engine outlets. a.  No wind.  Hovering in a no wind condition normally results in a relatively low spray concentration at all hover- ing altitudes. b.  Light winds (approximately 5 to 16 knots).  Hover- ing in these conditions results in the heaviest or most critical spray concentrations. Spray can be minimized by heading changes with reference to wind direction and ascertaining  minimum  spray  concentration  on  wind- shield. c.  Moderate    to    heavy    winds    (15    knots    and above).  Higher  winds  normally  result  in  the  lowest  of spray  concentration  at  all  hovering  altitudes.  In  these conditions, hovering can be accomplished into the wind. 8-4-42.  After Flight. Refer to Appendix C.







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