ATR 42-500, Manual

Page: 108 / 129

Q - Power plant
p. 107
4. ENG START panel
ATA 61/72
CRANK
dry motoring (no ignition)
START A OR B
on ground, only exciter A or
B is supllied (except for the
position A&B)
In flight regardless of start
selection (A, B or A+B) both
exciters are energized
ON
starter engaged. At 45% NH,
light goes off and the starter is
disconnected
ON
Continuous ignition (both A &
B). Memo panel light.
FAULT
Illuminates when:
– remains ON with NH
>45%
or – GCU failure during start
or – starter failure
or – ENG 2 only: ENG START
selector on start position
+ PROP BRK ON + GUST
lock not engaged
UNLOCK
PROP BRAKE not fully
locked or not fully released.
After 15 sec: CAP alarm. Also
used to check lock/unlock
time:
– 5 sec. to unlock
– 10 sec. to lock
READY
engagement or disengag.
conditions are met:
– A/C on ground
– gust lock engaged
– CL on FTH or FUEL S/O
– blue hyd press available
on the prop brake input
>2100psi
– Fire handle not pulled
PROP BRK
Brake fully locked same
indication on the memo panel
42/72 PEC
5. ENG control panel
ATA 61/72
ARMING CONDITIONS
PWR MGT sel on TO
+ATPCS pb in
+both PL > 49°
+both TQ > 46%
= (arm green LT illuminated)
TRIGGER
one TQ below 18%
Cancel: PWR MGT out of TO
or ATPCS pb OFF or at least
one PL retarded below 49° or
both TQ <46%
EEC
acts on stepper motor to
regulate Fuel Flow
FAULT flashing
EEC failure. The fuel flow is
frozen to maintain the power
FAULT steady: EEC failure,
HMU base law = reversion
When FAULT flashing, never
deselect the EEC.
Retard first, the PL in the
green sector (FAULT become
steady: PL < 52°)
UP TRIM
signal sent to respective eng
during ATPCS sequence.
Eng power = RTO
LO PITCH
blade angle < FI (8°) CAP in
flight only
OFF
HMU base law = reversion
ATPCS
– ARM on ground =
auto FTR (2.15’’ delay)
– ARM in flight (In case of go
around) = auto FTR only
42/72 PEC