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(e) Monitor cabin altitude;
descend as required.
(5) Monitor wings for icing.
Depart icing conditions as
soon as possible.
L-R WING TEMP LOW Wing anti-ice exhaust
duct temperature is
below 100° F (38° C).
A time delay inhibits
display of this message
for two (2) minutes after
selection of the WING
ANTI ICE switches to
ON.
(1) Increase thrust if flight
conditions permit.
(2) If message is not
extinguished
(a) Monitor wings for
icing.
(b) Depart icing
conditions as soon as
possible.
OPERATING MANUAL
MESSAGES AND ANNUNCIATIONS PROCEDURES 04-03-00
Page 15
October 11/02
Revision 8
CAS Message: Possible Cause(s): Corrective Action:
YAW DAMPER OFF Yaw Damper (YAW
DAMP ENG / DISENG)
switch is OFF.
OR:
Yaw Damper failure.
(1) Verify YAW DAMP switch
is engaged (DISEN legend
extinguished).
(2) If switch is engaged, check
CBs:
• STAB AUG SERVO #1:
Copilot’s Overhead, A-6
• STAB AUG SERVO #2:
Copilot’s Overhead, B-6
(3) Observe yaw damper
inoperative speed. See
Section 01-27-30, Yaw
Damper.
If necessary, see Section 05-03-
50, Yaw Damper Failure.
OPERATING MANUAL
04-03-00 MESSAGES AND ANNUNCIATIONS PROCEDURES
Page 16
October 11/02
Revision 8
CAS Message: Possible Cause(s): Corrective Action:
UNDER FLOOR
O’HEAT
Bleed air leak detected
under cabin floor.
(1) If wing anti-ice is ON,
select Left (L) WING ANTI
ICE switch to OFF. Wait
two (2) MINUTES.
(2) If message remains
displayed:
(a) Select Right (R)
WING ANTI ICE
switch to OFF.
(3) If message remains
displayed:
(a) Depart icing
conditions.
(b) Verify ISOLATION
valve is CLOSED.
(c) Select Left (L) ENG
BLEED AIR switch to
OFF.
(4) If message remains
displayed:
(a) Select Left (L) ENG
BLEED AIR switch to
ON.
(b) Select Right (R) ENG
BLEED AIR switch to
OFF.
(5) If message remains
displayed, physically check
floor board temperatures. If
floorboards are cool, no
action is required. If
floorboards are hot:
(a) Descend to 15,000 ft.
or below.
(b) Select Left (L) ENG
BLEED AIR switch to
OFF.
(c) Select RAM AIR
switch to ON.
If necessary, see Section 05-21-
60, Under Floor Overheat.
04-03-20: Other Caution Annunciations and Procedures
Should any of the following aural or visual caution annunciations occur, observe the
Crew Advisory system (CAS) for related messages, and perform the procedure related to
that caution message.
Annunciation: Cause or Meaning:
MASTER CAUTION reset switch ″C″
legend (amber) illuminated on Pilot’s /
Copilot’s Master Warning and Caution
Lights Panel.
A new CAUTION (amber) message is
displayed on CAS. The new message
will be displayed flashing on the top of
the CAUTION messages stack.
″Double Chime″ aural tone sounds.
OPERATING MANUAL
MESSAGES AND ANNUNCIATIONS PROCEDURES 04-03-00
Page 17
October 11/02
Revision 8
Annunciation: Cause or Meaning:
″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.
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.
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 bus has
failed, or input power circuit breaker is
open.
L ALT FAILED BRG light (amber)
illuminated on overhead panel.
Left alternator main bearing has failed
and alternator is operating on auxiliary
　
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