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10. If hot, descend to 15,000 ft. or below and select left bleed OFF and RAM Air ON.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-104 FAA APPROVED
13 September 2000
3-22-00: PRESSURIZATION/BLEED AIR SYSTEMS
3-22-30: Loss Of Automatic Pressurization Control:
1. AUTO/MANUAL Switch.........................................................................................MANUAL
2. DADC Selector Switch......................................................OPPOSITE DADC (DADC 1 or 2)
3. AUTO/MANUAL Switch...............................................................................................AUTO
If automatic pressurization control is not regained:
4. AUTO/MANUAL Switch.........................................................................................MANUAL
Manually control cabin pressure as described in the GIV Operating Manual.
NOTE: When operating in manual, the rate of change should be monitored to maintain a
maximum of 500 feet per minute UP or 300 feet 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.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-105
31 May 2000
6. Crew Oxygen Masks..........................................................................................................DON
7. Altitude .......................................................................... DESCEND TO A SAFE ALTITUDE
8. Passenger Oxygen Masks ...................................................................MANUALLY DEPLOY
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.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
3-106 FAA APPROVED
31 May 2000
3-22-40: Pressurization System - Rate Limiting:
If depressurization causes cabin pressure altitude to increase at a rate exceeding 3000 ft. per
minute, a rate-of-change limit switch is triggered. The MANUAL indicator light on the cabin
pressure control panel and CAB PRESS MAN message will illuminate. At the same time, the
outflow valve will be automatically driven closed. Such a triggering of the rate limit switch
could be due to a malfunction in the automatic controller or the result of inadvertently allowing
excessive cabin altitude climb rate to develop through improper operation of the system by the
flight crew. 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-of-change 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 full OPEN position.
GULFSTREAM AEROSPACE
GIV AIRPLANE FLIGHT MANUAL
SECTION 3
ABNORMAL
PROCEDURES
FAA APPROVED 3-107
31 May 2000
3-22-50: Bleed Air System Failure:
A bleed air system failure is recognized by the indication of zero bleed air pressure on the
overhead panel. Additionally, a right bleed air system failure may be accompanied by the blue
EICAS message ISOLATION VLV OPEN. In the event a bleed air system failure occurs, the
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湾4飞机飞行手册AFM Gulfstream IV AIRPLANE FLIGHT MANUAL 1(77)
