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either manual
or automatic
means.
1. No action required if
passengers require cabin
oxygen mask deployment.
2. If masks deployed in error,
repack masks and reset
system.
Quick Reference Handbook
REVISION 8 MESSAGES AND ANNUNCIATIONS
Oct 11/02 Page MB - 9
Caution (Amber) Messages and Annunciations, ctd… AFM 3A
Message: Cause(s): Corrective Action:
CABIN PRES
MANUAL
Cabin pressurization
controller
has been
switched to
manual control
automatically or
manually.
1. Cycle AUTO/MANUAL switch
to AUTO; check system.
2. If OK, leave switch in AUTO.
3. If not, switch to MANUAL and
control cabin pressurization
with MANUAL CONTROL
knob.
CHECK DU 1-2-3-
4-5-6
Information on
indicated display
unit may
be incorrect.
Verify data on indicated display
unit and if incorrect select different
sensor.
CHECK HYD
QUANTITY
Combined
and/or Flight
system quantity
is low.
Select HYDRAULICS synoptic
page and verify the system having
a low quantity. For Combined
system, see Combined Hydraulic
System Failure, page EF-5.
For Flight system, see Flight
Hydraulic System Failure, page
EF-6. For loss of both systems,
see Dual Hydraulic System
Failure, page EF-4.
CHECK PFD 1-2
(SPZ 8400 equipped)
Erroneous information
on
Primary Flight
Displays
(PFDs).
1. Check pitch, roll, airspeed and
altitude on both PFDs.
2. Compare with standby instruments
to verify information is
correct.
CHECK V
SPEEDS
The flight management
systems
have
computed Vspeeds
that are
different.
Compare V-speeds, verify initialization
and FMS status for mode
of operation.
CMB HYD FAIL Failure of combined
hydraulic
system pressure.
1. Check combined hydraulic
pressure.
2. If system has failed, land as
soon as practical.
3. To retain stall barrier protection,
turn utility hydraulic pump
ON if fluid is available.
4. Turn utility pump OFF if no fluid
is available.
5. See Combined Hydraulic
System Failure, page EF-5.
Quick Reference Handbook
MESSAGES AND ANNUNCIATIONS REVISION 8
Page MB - 10 Oct 11/02
Caution (Amber) Messages and Annunciations, ctd… AFM 3A
Message: Cause(s): Corrective Action:
CONV FAN FAIL,
L-R
A converter
cooling fan has
failed.
1. Record time of failure.
2. Continued operation for
maximum of 25 hours is
permitted.
3. Subsequent takeoffs are
permitted upon verification that
only one cooling fan has failed.
4. Operation with more than one
failed cooling fan may result in
damage to and/or automatic
shutdown of converter.
5. Light will remain illuminated.
NOTE: With ASC 285 incorporated, message will remain displayed.
Display of this message, whether momentary or permanently set, requires
a maintenance action.
CONV HOT, L-R Converter
temperature is
above 220°F
(104°C).
1. Turn ELECTRIC MASTER,
LEFT or RIGHT PWR OFF.
2. Light will remain on until
temperature reduces to 190°F
(88°C).
3. Try to turn converter back on, if
possible (after light is OFF).
4. Try reducing electrical load on
affected converter.
5. If illumination recurs, turn OFF
and do not reinstate.
COOL TURB HOT,
L-R
Cooling turbine
discharge air
above 450°F
(232°C).
1. On ground, ECS system will
automatically shut down.
2. In flight, see Left or Right
Cooling Turbine Hot, page
EH-9.
COWL A/I OVHT,
L-R
Engine cowl
temperature is
above 662°F
(350°C).
1. Turn COWL ANTI-ICE OFF.
2. If message persists, TURN
WING ANTI-ICE OFF.
3. If message persists, turn
associated BLEED AIR OFF.
4. Depart icing conditions.
Quick Reference Handbook
REVISION 7 MESSAGES AND ANNUNCIATIONS
May 30/02 Page MB -11
Caution (Amber) Messages and Annunciations, ctd… AFM 3A
Message: Cause(s): Corrective Action:
COWL PRESS
LOW, L-R
Cowl anti-ice
press. is less
than 10 ±1 psi.
(4 psi ±1 for
airplanes SN
1190 and subs.
and SN 1000
thru 1189 with
ASC 243).
1. Check engine power setting.
2. Increase thrust setting to
extinguish message if cowl
anti-ice pressure is less than 4
psi.
3. If cowl anti-ice pressure gage
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湾流4快速检查单QRH GULFSTREAM IV QUICK REFERENCE HANDBOOK 2(61)
