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Operation at NR (RRPM) below 45%
52.    712   ENGINE BEEP TRIM system operation

TM-1-1520-240-MTF Army Model CH-47D Heilcopter (EIC:RCD) Manual
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TM 1-1520-240-MTF 2-51 STARTING ENGINES (CONT.) NOTE Flight engineer check droop stops engage before ENG No. 1 shutdown. 48. 714A   Overspeed check: a.   Ensure  both  engines  are  in  PRI  FADEC position. b.   Ensure both ECLs are at GND. c.   Advance ENG 1 COND lever from GND to set  RRPM  at  79$1%.  Allow  RRPM  and FUEL FLOW to stabilize. d.   OSPD  switch  —  No.  1  activate  and  hold switch.   Check   that   fuel   flow   drops   to approximately 300 PPH. Fuel flow, PTIT, N1, and RRPM will decrease and stabilize but monitor for abnormal indications. e.   When fuel flow increase is noted — ENG 1 COND lever stop. f.   Release OSPD switch. g.   Advance ENG No. 2 ENG COND lever from GND to 791% RRPM. NOTE A reversionary start procedure may be used for ENG No.1 and ENG No. 2 restart. If a reversionary start is performed on either engine, step j and 49 may be disregarded for that engine. h.   ENG No. 1 — Restart. i.   Repeat steps d thru f for ENG No 2. j.   Normal shutdown.







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