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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
Selection of the RAM AIR switch to RAM will shut off bleed air for pressurization
and the airplane will depressurize.
6. Crew Oxygen Masks......................................................................................DON
7. Altitude...............................................................DESCEND TO SAFE ALTITUDE
8. Passenger Oxygen Masks ................................................MANUALLY DEPLOY
UPON REACHING A SAFE ALTITUDE, ATTEMPT TO REGAIN CONTROL OF THE
PRESSURIZATION SYSTEM AS FOLLOWS:
9. RAM AIR Switch..............................................................................................OFF
10. AUTO or MANUAL Control ..........................................ATTEMPT TO RESTORE
NOTE:
Avoid excessive power lever movements while
attempting to regain control of the pressurization
system.
05-22-40: Pressurization System - Rate Limiting
If depressurization causes cabin pressure altitude to a rate exceeding 3000 feet
per minute, a rate of change limit switch is triggered. The MANUAL indicator on
the CABIN PRESSURE CONTROL panel will illuminate and the amber CABIN
PRES MANUAL caution message will be displayed on CAS. At the same time, the
outflow valve will automatically be driven closed. Such a triggering of the rate of
change limit switch could be due to a malfunction in the automatic controller or the
result of inadvertently allowing an excessive cabin altitude climb rate to develop
OPERATING MANUAL
05-22-00 EXPANDED ABNORMAL / EMERGENCY PROCEDURES
Page 2
September 13/00
Revision 1
through improper operation of the system by the flight crew. The following
procedure is recommended to return to automatic operation:
1. AUTO / MANUAL Switch........................................................................MANUAL
Manually control system. Rate should not exceed 500 feet per minute UP or
DOWN. Observe position of outflow valve on indicator.
2. AUTO / MANUAL Switch .............................................................................AUTO
If the rate of change limit switch is re-triggered, place the AUTO / MANUAL switch
in MANUAL and continue flight. Cabin rate of change should be monitored to
maintain maximum of 500 feet per minute UP or DOWN.
CAUTION
WHEN OPERATING IN MANUAL MODE, MONITOR
CABIN ALTITUDE CLOSELY, ESPECIALLY IN
DESCENT, TO ENSURE THAT CABIN ALTITUDE
DOES NOT DECREASE TO LESS THAN LANDING
FIELD ELEVATION.
NOTE:
The opposite cabin pressurization control system
reference switch position (ADC #2) may be selected
and the procedure repeated, if necessary.
Care should also be taken to land unpressurized with the outflow valve indicator in
the full OPEN position.
05-22-50: Bleed Air System Failure
A bleed air system failure is recognized by the indication of zero air bleed
pressure on the overhead panel. Additionally, a right bleed air system failure may
be accompanied by display of a blue ISOLATION VLV OPEN advisory message
on CAS. In the event a bleed air system failure occurs, the following steps apply:
1. Affected BLEED AIR Switch ..........................................................................OFF
2. Affected Bleed Air System Circuit Breaker (CB)...................................CHECK
• L BLEED AIR: Pilot’s Overhead Panel, A-10
• R BLEED AIR: Pilot’s Overhead Panel, B-10
NOTE:
If CB(s) is popped, wait five (5) minutes to allow for
circuit cooling prior to resetting the CB.
FOR SN 1000 THROUGH 1201 WITHOUT ASC 298:
If the R BLEED AIR CB is popped, the blue ISOLATION VLV OPEN advisory
message will be displayed on CAS. Even though the message is displayed, the
isolation valve is closed.
NOTE:
The isolation valve must be manually opened from the
tail compartment in order to start the left engine.
OPERATING MANUAL
EXPANDED ABNORMAL / EMERGENCY PROCEDURES 05-22-00
Page 3
September 13/00
Revision 1
3. Right BLEED AIR Switch ...............................................................................OFF
4. R BLEED AIR CB .....................................................................ATTEMPT RESET
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湾流4操作手册 Gulfstream IV Operating Manual 3(121)
