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Dual System Failure - Loss of Pressure and Fluid

G500 Emergency Procedures

This is a work in progress


AFM Procedure

[AFM, §04-15-10]

Possible Cause

Left Hyd system pressure is less than 1600 PSI with Left Hyd quantity below 0.3 gallons and Right Hyd system pressure is less than 2350 PSI.

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System Impacts

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

  • Autothrottle: Use of the Autothrottle is prohibited during approach and landing with flaps 10° or less.

  • AUX Pump: Inoperative.

  • Flaps: Inoperative.

  • Flight Controls and Outboard Spoilers: Operative in EB Mode.

  • Inboard and Midboard Ground / Flight Spoilers: Inoperative.

  • Inboard / Outboard Brakes: Accumulator pressure only.

  • Landing: Maximum tailwind component for landing with flaps 10° or less is zero knots.

  • Normal Landing Gear Extension: Inoperative.

  • Nosewheel Steering: Inoperative.

  • PTU: Inoperative

  • Thrust Reversers: 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 (pressure and fluid)

  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.

  5. Airplane . . . Land at nearest suitable airport

  6. Once the landing airport has been determined:

    1. PTU . . . NOT ARMED / OFF

    2. AUX PUMP . . . NOT ARMED / OFF

    3. Brake Accumulator Pressure . . . Check

    4. If any brake accumulator pressure is below 2000 psi:

    5. NOTE

      Landing distance should be based on VREF +10 KCAS to touchdown.

      Wheel fuse plug release may occur due to added landing speed under combinations of high field elevation, landing weight and OAT.

      (1) Landing Distance . . . Recalculate with a 1.95 factor

    6. If all brake accumulator pressures are above 2000 psi:

    7. (1) Landing Distance . . . Recalculate with a 1.56 factor

    8. If landing with reduced flap settings above 64,350 lb, or with reduced flap settings above 60,000 lb with LFE above 10,000 feet:

    9. CAUTION

      LANDING WITH BRAKE ENERGY EXCEEDING 110.9 MFP MAY RESULT IN BRAKE FAILURE AND FIRE AFTER LANDING. CONSIDERATION SHOULD BE GIVEN TO AN ALTERNATE LANDING LOCATION AND NOTIFICATION OF EMERGENCY RESPONSE CREWS PRIOR TO LANDING.

      (1) Refer to 05-11-20, Tire Speed and BKE Limited Maximum Landing Weight.

    10. Runway . . . 150 ft wide minimum

    11. Crosswind . . . Less than 10 knots (if possible) / Touchdown on downwind side

    12. Approach . . . Plan shallow approach to touchdown in first 1000 feet

    13. Airspeed . . . Maintain 200 KCAS minimum (until ready to configure for landing)

  7. Approach

    1. If landing with flaps less than 6°:

    2. (1) WAI . . . ON

      (2) Wing Temperature . . . Verify above 100°F (above 400 feet AGL)

    3. AUTOTHROTTLE . . . DISCONNECT

    4. AT Auto-Engage Inhibit (TSC/Systems/AT Control) Select

    5. GPWS FLAP INHIBIT INHIBIT . . . Select (Flaps 20° or less)

    6. NOSEWHEEL STEERING POWER . . . OFF

    7. Airspeed . . . 175 KCAS maximum

    8. LANDING GEAR . . . DOWN

    9. EMER LDG GEAR Handle . . . Pull

    10. LANDING GEAR Lights . . . 3 green

    11. CAUTION

      DO NOT RESET THE EMER LANDING GEAR OR LANDING GEAR DUMP VALVES.

    12. Airspeed . . . Establish VREF+ 10 KCAS prior to FAF

    13. CAUTION

      WHEN LANDING WITH PARTIAL FLAPS, MINIMAL FLARE IS REQUIRED. IT MAY BE NECESSARY TO PUSH FORWARD ON THE SIDESTICK TO PUT THE NOSEWHEEL ON THE RUNWAY.

    14. Touchdown Ground Speed . . . 195 knots maximum

  8. Landing

  9. NOTE

    Brake accumulator pressure in flight should be 3000 PSI and therefore antiskid braking will be available through use of the brake pedals. Modulation of the brake pedals should be avoided as that will cause the brake accumulator pressure to deplete more rapidly.

    1. Braking . . . Constant brake pedal displacement

    2. Directional Control . . . Use Rudder and Differential Braking

    3. CAUTION

      DO NOT ATTEMPT TO TAXI AFTER LANDING. USING BRAKES DURING TAXIING WILL CAUSE RAPID LOSS OF BRAKE ACCUMULATOR PRESSURE AND LOSS OF BRAKING CAPABILITY WILL OCCUR.

      THE PARKING BRAKE WILL BE UNAVAILABLE ONCE INBOARD ACCUMULATOR PRESSURE IS LOST.

    4. Toe Brakes . . . Maintain

    5. Wheel Chocks . . . Install

    6. CAUTION

      THE LANDING GEAR SAFETY PINS SHALL BE INSTALLED PRIOR TO RESETTING THE DUMP VALVES.

    7. Landing Gear Safety Pins . . . Install

References

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

Revision: 2019-04-30
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