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per minute DOWN. Care should also be taken to land unpressurized with
the outflow valve indicator in the full OPEN position.
CAUTION: CLOSELY MONITOR CABIN DIFFERENTIAL PRESSURE.
DO NOT ALLOW IT TO EXCEED 9.8 PSID.
If manual pressurization control is not successful and if cabin
differential pressure will exceed 9.8 PSID:
5. RAM AIR Switch.......................................................................RAM
Selecting RAM will shut off bleed air for pressurization and the
airplane will depressurize.
6. Crew Oxygen Masks ................................................................DON
7. Altitude .....................................DESCEND TO A SAFE ALTITUDE
8. Passenger Oxygen Masks ............................MANUALLY DEPLOY
Select MAN on PASSENGER OYGEN control panel. Verify mask
deployment.
Continued on next page →
Quick Reference Handbook
REVISION 7 ABNORMAL / EMERGENCY PROCEDURES
May 30/02 Page EH - 5
Loss Of Automatic Pressurization Control, ctd… AFM 3-22-30
Upon reaching a safe altitude, attempt to regain control of the
pressurization system:
9. RAM AIR Switch....................................................................... OFF
10. AUTO or MANUAL Control.....................ATTEMPT TO RESTORE
NOTE: Avoid excessive throttle movements while attempting to regain
control of the pressurization system.
END
Pressurization System - Rate Limiting AFM 3-22-40
The following procedure is recommended to return to automatic
operation:
1. AUTO / MANUAL Selector Switch...................................MANUAL
Manually control system. (Rate should not exceed 500 ft. per
minute up or down.) Observe position of outflow valve on
indicator.
2. AUTO / MANUAL Selector Switch....................................... AUTO
If rate-of-change switch is retriggered, PLACE the AUTO /
MANUAL Switch in MANUAL and continue flight. Cabin rate-ofchange
should be monitored to maintain maximum of 500 ft. per
minute, up or down.
CAUTION: WHEN OPERATING IN MANUAL, MONITOR CABIN
ALTITUDE CLOSELY, ESPECIALLY IN DESCENT, TO ENSURE THAT
CABIN ALTITUDE DOES NOT DECREASE TO LESS THAN LANDING
FIELD ELEVATION.
NOTE: Opposite cabin pressure reference switch position DADC 2 may
be selected and procedure repeated, if necessary.
Care must be taken to land unpressurized with outflow valve in
the full OPEN position.
END
Quick Reference Handbook
ABNORMAL / EMERGENCY PROCEDURES REVISION 7
Page EH - 6 May 30/02
Bleed Air System Failure AFM 3-22-50
In the event a bleed air system failure occurs, the following steps
apply:
1. Affected Bleed Air Switch..........................................................OFF
2. Affected BLEED AIR Circuit Breaker .................................. CHECK
(L BLEED AIR: PO, A-10; R BLEED AIR: PO, B-10)
NOTE: If the circuit breaker is popped, wait 5 minutes to allow for circuit
cooling prior to resetting the circuit breaker.
For SN 1000 thru 1201 without ASC 298:
If the right system circuit breaker is popped, the ISOLATION VLV
OPEN message will be present on EICAS. Even though the message
is present, the isolation valve is closed.
NOTE: The isolation valve must be manually opened from the tail
compartment in order to start the left engine.
1. Right Bleed Switch ....................................................................OFF
2. Right BLEED AIR Circuit Breaker ......................ATTEMPT RESET
If CB resets:
1. Isolation Valve........................................................................OPEN
2. Altitude ...............................DESCEND TO 41,000 FT OR BELOW
3. Flight Into Known Icing Conditions........................................AVOID
If CB will not reset:
1. Right ECS Pack Switch.............................................................OFF
2. Altitude ...............................DESCEND TO 41,000 FT OR BELOW
3. Flight Into Known Icing Conditions........................................AVOID
FOR ALL OTHER FAILURE INDICATIONS:
If the affected system circuit breaker is not popped, pull and reset
the circuit breaker.
If resetting the circuit breaker solves the problem, continue flight
in normal configuration.
Continued on next page →
Quick Reference Handbook
REVISION 7 ABNORMAL / EMERGENCY PROCEDURES
May 30/02 Page EH - 7
Bleed Air System Failure, ctd… AFM 3-22-50
If resetting the circuit breaker does not solve problem or if circuit
breaker does not reset:
For Left Bleed Air System:
1. Left Bleed Air Switch ................................................................ OFF
2. Isolation Valve ....................................................................... OPEN
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湾流4快速检查单QRH GULFSTREAM IV QUICK REFERENCE HANDBOOK 3(52)
