ATR 42-500, Manual

Page: 115 / 129

Annexes
p. 114
Anne
xes
STBY HORIZON (DC EMER)
Red and black flag: elec
supply loss or gyro speed
insufficient.
FAULT
detector failure or supply loss
(ACW BUS 2).
CAP . (FAULT
LT supplied by DC EMER).
ICING steady
ice accretion is detected
and both horns anti icing +
airframe deicing are selected
ON. MC + SC.
ICING flashing
ice accretion is detected and
either horn and/or airframe
selected OFF. MC + SC.
PTT pb
press for 3 sec.
– icing will flash if system
works correctly.
– FAULT LT illuminate steady
if ice detector failure is
detected.
ICING AOA Lt
illuminates green as soon
as 1 horn anti-icing ON.
Stall alarm (stick shaker
threshold lowered). It can be
extinguished manually only by
releasing ICING AOA Pb (DC
EMER) provided both Horns
anti-icing selected OFF.
TAS Ind
from selected ADC indicates
TAS from 68 to 600 kts; if
ADC not valid it displays (---).
TAT Ind
from selected ADC Indicates
TAT; If ADC not valid , it
displays (---).
SAT pb
shows SAT when depressed
and held.
TEST pb
when pushed in, displays all
8’s + LO LVL LTs, +
CAP +
elect Pumps energized.
Refuel panel disabled during
test and refuel valves auto
close.
LO LVL Lt
– When the quantity is
<160kg or
– When the quantity is
>160kg, but the feeder tank
is not full (Feeder jet pump
failure)
Elec pump auto runs.
CAP .
STBY IAS and ALT Ind
both supplied by Stby pitot
and static source: completly
independent from CPT / F0
systems.
PWR MGT
2 co-axial sw, (LH: Bottom/
RH: Top) providing FDAU,
PEC, PIU and EEC with basic
power requirements.
SGL CH
illuminates when one channel
is lost (2 sec on, for self test
when advancing CL from FTR
to AUTO).
FAULT : illuminates when both
PEC channels are lost CAP .
OFF : PEC is deactivated and
Np is limited at 102.5% by the
overspeed governor if power
is sufficient.