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side may be recognized by increasing torque on the affected
engine, decreasing torque on the unaffected engine,
an increase in RRPM, and a lack of response of
normal engine beep trim. These indications should be
confirmed by observing all the engine instruments.
Controling RRPM with the ECL must be done smoothly
and with care. Engine response is much faster and it is
possible to cause the RRPM to exceed limitations or
decrease to the point that the generators will be disconnected
from the buses. If the thrust control is moved, it is
necessary to control RRPM with the engine condition
lever and the No.1 and 2 ENGINE BEEP TRIM switch. If
a malfunction to the high side occurs, perform the following:
1. Thrust control — Adjust as required to
maintain RRPM within limits.
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 affected
engine, increasing torque on the unaffected engine,
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 engine
failure: therefore, engine instruments must be monitored
to determine which event has occurred. A static
failure may be recognized by failure of one or both engines
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 necessary
to control RRPM and torque by use of the appropriate
EMERG ENG TRIM INC or DECR switch. Perform
the following:
1. EMERG ENG TRIM switch (affected engine)
— Adjust as required.
2. EMERG ENG TRIM AUTO/MANUAL
switch (affected engine) — MANUAL.
3. EMERG ENG TRIM switch (affected engine)
— Adjust in coordination with the ENGINE
BEEP TRIM NO. 1 &2 switch to normal
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 include
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 (affected
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 FADEC
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 possibility
of abrupt NR changes when opening
the FADEC in single or dual engine REV
mode(s).
When operating in the reversionary mode and the reversionary
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
　
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