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12.  The  engine  trim
V.   CARGO RAMP AND DOOR CHECK.

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 4-45 screw changes N1 approximately 1% PTIT approximately 25_C and torque 5 - 6%. If the recorded N1 is acceptable, but the recorded PTIT is lower than it should be according to 11a, a resistance check of the PTIT harness should be performed. If the PTIT indicating system is OK the engine is acceptable. U.  DIFFERENTIAL CURRENT PROTECTION CIRCUIT CHECK 1-44. Reference: TM 55-1520-240-23 Perform this check whenever maintenance has been performed on a generator, or a generator control unit, a current transformer or the wiring between these units. Perform the check as follows: 1.  Set   the   following   switches   to   the   specified positions: a.   HEATER — VENT BLOWER ONLY. b.   CPLT,     CTR,     and     PLT     WINDSHIELD ANTI-ICE — ON. c.   CPLT and PLT SLT-FIL — ON. d.   FUEL PUMPS — ALL ON. 2.  GEN 1 switch — OFF. Check NO. 1 GEN OFF caution light is on and NO. 2 GEN OFF caution light is out. 3.  GEN  1  switch  —  ON.  GEN  2  switch  —  OFF. Check NO. 1 GEN OFF caution light is out and NO. 2 GEN OFF caution light is on. 4.  GEN  2  switch  —  ON.  Check  both  GEN  OFF caution lights are out. 5.  HEATER,   WINDSHIELD   ANTI-ICE,   SLT-FIL, and FUEL PUMPS switch — Set as desired.







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