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BEFORE HOVER
HIT/PAT check

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 2-62 B BEFORE HOVER (CONT.) (4)   Pilot’s No. 1 INC/DEC switch check for proper     operation     with     momentary decrease  then  increase  checking  N1, PTIT, torque, and RRPM response. (5)   Copilot’s No. 1 INC/DEC switch — DEC and hold. Check that RRPM stabilizes at 97% (+1%, -2%). If RRPM continues to decrease below 97%, return RRPM to 100% by holding the switch in the INC position   and   releasing   it   at   100% RRPM. Corrective maintenance action is required. (6)   Copilot’s FADEC No. 1 INC/DEC switch —  INC  Incrementally  until  RRPM  no longer  increases.  Check  that  RRPM stabilizes at 103% (+2%, -1%). If RRPM continues to increase, return RRPM to 100% with the Copilots FADEC No. 1 INC/DEC switch. Corrective maintenance action is required. (7)   Copilot’s  beep  No.  1  INC/DEC  switch DEC   as   necessary   to   obtain   100% RRPM. (8)   Thrust    Cont    lever    —    Increase    to maximum possible without lifting off the ground. Check that RRPM stabilizes at 100% 2%. (9)   Thrust   Control   Lever   —   Reduce   to Ground Detent. (10)   FADEC No. 1 switch — PRI. (11)   ENG No. 2 ECL — FLT. (12)   Repeat steps (1) through (10) with other engine.







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