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52.    712   ENGINE BEEP TRIM system operation
NO. 1 & NO. 2 ENGINE BEEP TRIM switch.

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 2-53 STARTING ENGINES (CONT.) NOTE If DECU display is not 88, shut down engine being checked and remove all power from the DECU by pulling the respective PRI CONT and REV CONT circuit breakers on the PDP. Repeat engine start sequence  and  DECU  fault  monitoring  check.  If DECU  display  is  not  88  refer  to  latest  AMCOM DECU   fault   code   matrix.   System   should   be troubleshot  and  repaired  prior  to  releasing  the aircraft for missions. B*  56. 714A DECU Start BIT — Check as follows: a.   ENG COND levers — Retard 5 degrees. F b.   Check No. 1 and No. 2 DECUs display reads 88. c.   ENG COND levers — Flight. B*  57.   POWER XFR NO. 1 and NO. 2 — OFF. B*  58.   APU switch — OFF. APU ON caution light  712 caution light,714A   advisory light — OUT. B* 59.   Systems — Check. a.   Rotor,  torque,  engine,  transmission,  fuel, and   712   caution panel, or 714A   master caution/advisory panel. b.   ENG OIL PRESS — Check. Fluctuation $5 psi maximum. F c.   Maintenance Panel — Check as follows (1)   Hydraulic pressures and temperatures — Check. (2)   Bite indicators — Check all black and caution lights out.







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