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Message: Cause(s): Corrective Action:
TRU HOT Transformer
rectifier
temperature.
above 374°F
(190°C).
Reduce load on TRU. If warning
continues after 2 minutes:
1. Select other available DC
power source(s).
2. Pull TRU (R AC) circuit
breaker.
UNDER FLOOR
O’HEAT
Bleed air leak
detected under
cabin floor.
1. If wing anti-ice is on, select left
wing OFF.
2.Wait 2 minutes.
Then:
1. If message persists:
• Select right wing OFF.
• Depart icing conditions.
2. Verify isolation valve is closed.
3. Select left bleed OFF.
4. If message persists:
• Select left bleed ON and right
bleed OFF.
• Check floor board physically
for temperature.
5. If cool, no action.
6. If hot, descend to 15,000 ft. or
below and select left bleed
OFF and RAM AIR ON.
UTILITY HYD OFF Utility hydraulic
pump has been
selected off.
Turn utility hydraulic pump to
ON/ARM if desired.
Quick Reference Handbook
MESSAGES AND ANNUNCIATIONS REVISION 7
Page MB - 20 May 30/02
Caution (Amber) Messages and Annunciations, ctd… AFM 3A
Message: Cause(s): Corrective Action:
WING HOT, L-R Wing anti-icing
exhaust duct
temperature
above 180°F
(82°C).
1. Turn applicable wing anti-icing
switch to OFF. Wait two (2)
minutes.
2. If message remains ON,
assure isolation valve is
closed, then select applicable
side BLEED AIR switch to
OFF.
3. If message remains ON,
indication is false and flight
may be continued with normal
use of wing anti-icing. Reselect
applicable BLEED AIR switch
ON.
4. If message goes out in Step 2,
leave applicable BLEED AIR
switch OFF, select applicable
ECS pack OFF, and re-check
isolation valve closed. Descend
to 41,000 ft. Monitor cabin
altitude; descend as required.
5. Monitor wings for icing. Depart
icing conditions as soon as
possible.
WING TEMP
LOW, L-R
Wing anti-icing
exhaust duct
temperature
below 100°F
(38°C). Will not
illuminate for
two (2) minutes
after switch ON
(time delay).
1. Increase thrust if flight
conditions permit.
2. If message does not go out,
monitor wings for icing and
depart icing conditions as soon
as possible.
YAW DAMPER
OFF
Yaw damper
switch OFF or
yaw damper
failure.
1. Check yaw damper switch ON
(light out).
2. If switch on, check STAB AUG
SERVO circuit breakers (STAB
AUG SERVO #1: CPO, A-6;
STAB AUG SERVO #2: CPO,
B-6.)
3. Observe yaw damper
inoperative speed. See Yaw
Damper Failure, page EE-10.
Quick Reference Handbook
REVISION 7 MESSAGES AND ANNUNCIATIONS
May 30/02 Page MB - 21
Caution (Amber) Messages and Annunciations, ctd… OM 04-03-20
Annunciation: Cause(s):
MASTER CAUTION reset switch "C"
legend (amber) illuminated on Pilot’s
/ Copilot’s Master Warning and
Caution Lights Panel.
"Double Chime" aural tone sounds.
A new CAUTION (amber) message
is displayed on CAS. The new
message will be displayed flashing
on the top of the CAUTION
messages stack.
"Lo-Lo-Lo" aural tone sounds. Autothrottle disconnected.
"Lo-Hi-Lo" aural tone sounds. Autopilot manually disconnected.
AC RESET light (amber) illuminated
on EPMP.
AC Bus fault indicated.
A fault on the L or R MAIN AC bus
will result in that bus being
disconnected from all power sources.
No power source light will be
illuminated.
A fault on the ESS AC bus will result
in the AC BPCU cycling bus power
from LEFT to RIGHT to E-INV. The
amber E-INV "ON" switch legend will
also be illuminated.
See Bus Fault - AC or DC RESET
Light on, page EA-13.
DC RESET light (amber) illuminated
on EPMP.
DC Bus fault indicated.
A fault on the L or R MAIN DC bus
will result in that bus being
disconnected from all power sources.
No power source light will be
illuminated.
A fault on the ESS DC bus will result
in the DC BPCU cycling bus power
from LEFT to RIGHT to BATT. The
amber BATT "ON" switch legend will
also be illuminated.
See Bus Fault - AC or DC RESET
Light on, page EA-13.
BATT 1 or BATT 2 CHGR FAIL light
(amber) illuminated on EPMP.
Battery or battery charger has failed,
Left Main AC bus or Right Main AC
　
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