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AFM Procedure

[AFM, §03-21-100]

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Corrective Action

  1. CPC FAULT/MANUAL Switch . . . MANUAL

  2. CAUTION

    WHEN OPERATING IN MANUAL MODE, THE CABIN RATE OF CHANGE SHOULD BE MONITORED TO MAINTAIN A MAXIMUM OF ±500 FPM. CHANGES IN ENGINE THRUST, AIRSPEED, AND ALTITUDE WILL AFFECT CABIN AIRFLOW AND CAUSE VARIATIONS IN CABIN PRESSURE AND RATES OF CHANGE.

  3. CABIN ALT Knob . . . Control to ±500 FPM rate of change

  4. CPCS CBs . . . PULL and RESET

  5. CAB PRESS CH1 - SSPC 2109
    CAB PRESS CH2 - SSPC 2110

  6. If CPCS reset is successful:

    1. CPC FAULT/MANUAL Switch . . . Deselect MANUAL

    2. CPCS MODE (OHPTS/CPCS/ System Mode) . . . AUTO

    3. CPCS . . . Monitor

  7. If CPCS reset is not successful:

    1. CPC FAULT/MANUAL Switch . . . MANUAL

    2. CAUTION

      CARE MUST BE TAKEN TO LAND UNPRESSURIZED WITH OUTFLOW VALVE IN FULL OPEN POSITION.

      CLOSELY MONITOR CABIN DIFFERENTIAL PRESSURE. DO NOT ALLOW DIFFERENTIAL PRESSURE TO EXCEED 10.80 PSID.

    3. CABIN ALT Knob . . . Control to ±500 FPM rate of change

  8. If manual pressurization control is not successful:

    1. Crew Oxygen Mask . . . Don

    2. MIC (COMM JACKS) . . . MASK

    3. RAM AIR (OHPTS / ECS) . . . Select

    4. Altitude . . . Descend to 10,000 feet or minimum Enroute altitude (if higher)

    5. NOTE

      For continued flight in the unpressurized condition, opening the TROV increases cabin airflow and prevents cabin overheat.

    6. CABIN ALT Knob . . . Adjust (as required)

    7. Passenger OXYGEN . . . MAN

    8. NOTE

      Emergency lighting should be considered for cabin occupants.

    9. Emergency Power . . . ON (If required)

    10. Upon reaching a safe altitude, attempt to regain control of the pressurization system as follows:

    11. NOTE

      Avoid excessive throttle movements while trying to regain control of the pressurization system.

      (1) RAM AIR (OHPTS / ECS) . . . OFF

      (2) AUTO or MANUAL CPCS Control . . . Try to restore

References

Gulfstream GVII-G500 Airplane Flight Manual, Revision 3, July 16, 2019

Gulstream GVII-G500 Production Aircraft Systems, Revision 1, Oct 1, 2018

Revision: 20190731
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