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Left System Failure - Loss of Pressure Only

G500 Abnormal Procedures

This is a work in progress


AFM Procedure

[AFM, §03-15-10]

Possible Cause

The left HYD pressure is less than or equal to 2349 PSI or greater than or equal to 3449 PSI.

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System Impacts

  • Aircraft Operating Envelope: Speed reduced to 285 KCAS / 0.90M maximum.

  • Left Thrust Reverser: Inoperative.

  • Midboard Spoilers: Inoperative.

Corrective Action

  1. Airspeed . . . 285 KCAS / 0.90M maximum

  2. NOTE

    With the landing gear in the up position the Left Hydraulic System reservoir will show approximately one gallon of fluid with a complete loss of Left Hydraulic System fluid. When the gear is selected down, the Left Hydraulic System reservoir will indicate empty.

  3. Hydraulic Synoptic / Quantity . . . Check

  4. If a loss of L SYS fluid is suspected or has occurred:

    1. Refer to 04-15-20, Left Hydraulic System (L SYS) Failure - Loss of Pressure and Fluid.

  5. If the hydraulic failure occurred within 2 hours of takeoff:

  6. WARNING

    IF A HYDRAULIC SYSTEM FAILURE OCCURS WITHIN 2 HOURS AFTER TAKEOFF, LAND AT THE NEAREST SUITABLE AIRPORT NO MORE THAN 4 HOURS AFTER THE FAILURE OCCURRED. CONTINUING FLIGHT IN EXCESS OF 4 HOURS COULD RESULT IN A FLIGHT CONTROL SURFACE FAILURE, AND A LOSS OF AIRCRAFT CONTROL.

    I am told that this is because the hydraulic fluid gets hot during takeoff and takes four hours to cool. If it has less than that and is just sitting stagnant in the lines, it is apt to rupture a seam or fitting and leak.

    1. Airplane Land at nearest suitable airport no more than 4 hours after the hydraulic failure, then go to Step 6

  7. If the hydraulic failure did not occur within 2 hours of takeoff:

  8. NOTE

    Hydraulic fluid temperature has stabilized, and flight control surface failure is not a concern.

    1. Airplane . . . Land as soon as practicable

  9. Once the landing airport has been determined:

    1. PTU . . . NOT ARMED / OFF

  10. Approach

    1. PTU . . . ARMED / ON

    2. NOTE

      With the auxiliary hydraulic pump armed, the pump will automatically activate if required to assist the PTU in providing demanded pressure and to provide pressure for landing gear and flaps.

    3. AUX PUMP ARMED / OFF

    4. NOTE

      For landing gear and flap operation, operate one system at a time allowing completion of cycle before operating the next system.

    5. FLAPS . . . 20°

    6. LANDING GEAR / Lights . . . DOWN / 3 green

    7. FLAPS . . . 39°

    8. Before Landing Checklist . . . Perform

  11. Approximately 1 minute prior to landing:

    1. AUX PUMP . . . ARMED / ON

  12. Landing

    1. Brakes / Steering . . . As required to maintain directional control

    2. Thrust Reverser (Right) . . . As required

References

Gulfstream GVII-G500 Airplane Flight Manual, Revision 1, August 31, 2018

Revision: 2019-04-18
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