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5.  Speed Sweep
11.  CYCLIC TRIM

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 2-81 IN-FLIGHT (CONT.) d. 712   Decrease rotor rpm to 97%, and start clock.     714A      FADEC   NR%   switch   — Decrease  RRPM  to  97%  and  start  clock. Absorbers should retune within 60 seconds. e.   Return RRPM to 100%. 8.  Rotor   RPM   Droop   Check   and   Thrust   Rod Slippage Check. a.   Stabilize airspeed at 125 knots straight and level. b.   Rotor rpm 100%. (1)   Maintaining altitude and direction  712 without beeping RRPM, increase thrust as  necessary  to  stabilize  airspeed  at 140   knots   with   thrust   brake   trigger depressed.    Note    and    record    any change in RRPM from 100%. Note dual engine TRQ then release thrust brake trigger  and  relax  pressure  on  thrust. Note  and  record  any  change  in  dual engine TRQ. (2)   Maximum change in rotor rpm shall be 712   2% or  714A   +1%. (3)   Maximum    thrust    rod    slippage    with thrust brake applied shall be 2% dual engine torque. 9.  Speed Sweep — Check. Stabilize airspeed at 140 knots. a.   Record longitudinal stick position. b.   Record lateral stick position. c.   Record directional pedal separation. d.   Compare pilot and copilot airspeed indicators (6 knots maximum difference).







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