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8.  Rotor   RPM   Droop   Check   and   Thrust   Rod Slippage Check
a.   Autorotation RRPM

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 2-82 IN-FLIGHT (CONT.) 10.  Speed Sweep — Check. Increase   and   stabilize   airspeed   at   150 knots. a.   Record longitudinal stick position. b.   Evaluate 1/REV and 3/Rev vibration. c.   Coordinated turns. 11.  CYCLIC TRIM — Check. a.   Observe   both   CYCLIC   TRIM   indicators have reached the leading edge of the EXT range   150   knots.   FWD   and   AFT   LCT schedules    corrections    for    increases    in pressure altitude are shown in Section V. IN-FLIGHT (CONT.) b.   Decrease   and   stabilize   airspeed   below extended  envelope  corrected  for  altitude (Refer to Section V). c.   CYCLIC TRIM indicators — Check both out of EXT range. CAUTION Before  entering  autorotation  ensure  outside area  is  clear,  suitable  forced  landing  area within range and crew notified. NOTE Autorotation     above     102%     RRPM     will     be accompanied by an overall increase in vibration. 12.    712  Autorotation RRPM — Check as follows:







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