TM  1-1520-240-10 9-1-18            2.   ENG   COND   lever   (affected   engine)   — Adjust to a position between FLT and GND that will control RRPM. 3.   ENGINE BEEP TRIM switch NO. 1 & 2 — Adjust as required. 4.   Land as soon as practicable. 9-1-16. 712 Normal Engine Beep Trim System Failure (Low Side or Static). Failure of the normal engine beep trim system to the low side can be recognized by decreasing torque on the af- fected engine, increasing torque on the unaffected en- gine,  a  lossof  RRPM,  a  lack  of  response  to  ENGINE BEEP TRIM and N1 satbilized at or above ground idle (60 to 63% N1). These indications also accompany an en- gine failure: therefore, engine instruments must be moni- tored to determine which event has occurred. A static failure may be recognized by failure of one or both en- gines to respond to beep commands or may resemble a high or low side failure when the thrust control is lowered or raised. If the thrust control is moved with either EMERG ENG TRIM AUTO/MANUAL switch in MANUAL, it is neces- sary to control RRPM and torque by use of the appropri- ate EMERG ENG TRIM INC or DECR switch. Perform the following: 1.   EMERG ENG TRIM switch (affected en- gine) — Adjust as required. 2.   EMERG    ENG    TRIM    AUTO/MANUAL switch (affected engine) — MANUAL. 3.   EMERG ENG TRIM switch (affected en- gine) — Adjust in coordination with the EN- GINE BEEP TRIM NO. 1 &2 switch to nor- mal operating RRPM and match torque. 9-1-17. 714A FADEC FAILURES. In some cases a failure may occur without illuminating the FADEC, REV, and/or ENG FAIL light(s) and the only indication of a failure will be from engine indications. In these cases the pilot must excersise prudent judgement and perform actions as required. Those actions may in- clude increasing the thrust for a runaway engine, manual ECL  control,  manually  selecting  FADEC  control  panel switches, or engine shutdown for a fail fixed position. 9-1-18. 714A FADEC 1 or FADEC 2 Caution. 1.   FADEC   INC-DEC   beep   switches   (af- fected engine) — Adjust as required. 2.   Reduce    rate    of    Thrust    CONT    lever changes. 9-1-19. 714A FADEC 1 and FADEC 2 Cautions. 1.   FADEC ENG 1 and ENG 2 INC-DEC beep switches  — Beep to 100 percent, match TQs. 2.   Reduce   rate   of   THRUST   CONT   lever changes. 3.   Land as soon as practicable. 9-1-20.  Engine   Fluctuations   without   FADEC   1/2 Light. The FADEC system may fail without illuminating the FA- DEC 1/2 light. this will be indicated by power fluctuations (TQ, N1, Fuel Flow, Rotor RPM, and PTIT indications) with a set thrust position. Proceed as follows: Load share switch — Select PTIT. If engine power flucations are not correct. 1.   Load share switch — TQ. 2.   No. 1 engine FADEC switch — REV. If engine power flucations are not correct. 3.   No. 1 engine FADEC switch — PRI. 4.   No. 2 engine FADEC switch — REV. If engine power flucations are not correct. Land as soon as practicable. 9-1-21.   ^714A   Reversionary System Failures. CAUTION The aircrew should be alert to the possibil- ity of abrupt NR changes when opening the FADEC in single or dual engine REV mode(s). When operating in the reversionary mode and the rever- sionary  mode  sustains  a  hard  fault,  REV  1  or  REV  2 caution illuminates, a failed fixed fuel flow condition may exist, The ENG COND lever will be inoperative, therefore unable to modulate engine N1. The indications may be a  change  in  sound,  vibration  absorbers  may  detune causing vibration and a possible increase in NR when the THRUST CONT lever is reduced. The Reversioanry may also fail without illuminating the REV light. In this case, the Reversionary beep switces may become inoperative but the ENG COND lever may be operative. Two different reactions can occur depending if the engine with the failed FADEC went into fixed fuel flow at a high fuel flow or a low fuel flow. In a high fuel flow situation, the FADEC on the non mal- functioning  engine  may  cause  the  non  malfunctioning engine to drop off line in an effort to maintain 100 percent NR (since the failed engine has a high fixed fuel flow).