ATR 42-500, Manual

Page: 116 / 129

Annexes
p. 115
FUEL FLOW Ind
(DC BUS 1/2)
FU reset knob
FU reset to 0 when pulled.
FUEL USED Readout
(DC BUS 1/2)
Arming conditions:
PWR MGT sel on TO
+ATPCS pb in
+ both PL >49°
+ both TQ > 53%(42)
both TQ > 46% (72)
ARM green LT on.
UPTRIM
signal sent to respective eng
during ATPCS sequence.
Eng power = RTO.
LO PITCH
blade angle < 8° (below FI)
CAP in flight only.
TORQUE Ind (DC EMER)
2 probes sending info:
– to pointer (via AFU).
– to digital counter (via EEC).
Internal bug
computed by FDAU; shows
RTO when PWR MGT on TO,
otherwise max TQ depending
on PWR MGT selection.
NP Ind
(DC ESS)
LIMITS
From 0 to 120%.
TEST
115% (blue dot).
ITT Ind
(DC ESS)
From 0 to 1200°C.
Red point: 840° (20 sec
max)
Red point+S: 950° (5 sec
max on START).
FUEL CLOG
Fuel press loss in
corresponding HP
pump fuel filter (DC
BUS 1/2)
ΔPSI >25 PSI: CAP
Filter blocked and
by-passed when
ΔPSI >45.
ATPCS
Trigger
one TQ <18% (42)
one TQ <18% (72).
Cancel
PWR MGT out of TO
or ATPCS pb OFF
or at least one PL retarded <49°
or both TQ <53%.
EEC
acts on stepper motor, to regulate Fuel
Flow.
FAULT flashing
EEC Failure. The fuel flow is frozen to
maintain the power. (Do not deselect
EEC when flashing)
The PL has to be retarded to the green
sector before deselection of the EEC
FAULT steady
EEC Failure. HMU base law = reversion.
Fault become steady when the PL is
retarded in the green band.
OFF
HMU base law = reversion.
OIL TEMP
(DC BUS 1/2)
From 0 to 130°C
ATPCS
– ARM on ground =
auto FTR (2.15” delay)
– ARM in flight (In case of go
around) = auto FTR only.
TORQUE Ind
White TQ bug manually selected.
Knob enables setting of white TQ bug.
LIMITS
From 0 to 137% (42)/0 to 109.5% (72).
Actual TQ display.
Dashes ( - - - - ) for an Handling Bleed
Valve failure (anti surging system of the
engine)
TEST
115% (blue dot)
ALERT Lt
> 800°C (or > 715°C on
ENG2 in hotel mode). CAP.
TEST
1150° (blue dot)
NH-NL Ind
(DC ESS)
Thin pointer: NL
(104.2% max)
Wide pointer and
digital display: NH
(102.7% mar)
TEST
115% (blue dot)
FUEL TEMP Ind
sensor before HP pump (DC BUS 1/2).
From –54 to +57°C.
OIL PRESS
(DC BUS 1/2).
From 0 to 90 psi
OIL LOW PRESS Lt
< 40 PSI. A separate press sw activates CCAS below 40 PSI