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Right System Failure - Loss of Pressure and/or Fluid

G500 Abnormal Procedures

This is a work in progress


AFM Procedure

[AFM, §03-15-20]

Possible Cause

The right hydraulic pressure is less than 2349 PSI or greater than 3449 PSI or indicated hydraulic fluid quantity is less than 0.3 gal.

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System Impacts

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

  • Inboard Spoilers: Inoperative.

  • Outboard Brakes: Accumulator pressure only.

  • PTU: Inoperative.

  • Right Thrust Reverser: Inoperative.

Corrective Action

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

  2. Hydraulic Synoptic / Quantity . . . Check

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

  4. 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

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

  6. NOTE

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

    1. Airplane . . . Land as soon as practicable

  7. PTU . . . NOT ARMED / OFF

  8. Landing

    1. Brake Accumulator Pressure . . . Check

    2. If Right brake accumulator pressure is below 2000 psi:

    3. (1) Landing Distance . . . Recalculate with 1.25 factor

      NOTE

      The outboard brake accumulator pressure will not be replenished. When the outboard brake accumulator pressure is depleted, continued operation and braking will be performed only with the inboard brakes.

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

    5. Thrust Reverser (Left) . . . As required

References

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

Revision: 20190503
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