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Uncommanded Applied Brake Pressure

G500 Abnormal Procedures

This is a work in progress


AFM Procedure

[AFM, §03-18-10]

Possible Cause

Brake pressure (200 PSI on ground / 500 PSI in flight) detected with no brake pedal or parking brake handle application.

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Corrective Action

  1. In Flight

    1. PARKING BRAKE Handle . . . Verify down

    2. If the landing gear is not extended:

    3. (1) Flight . . . Continue until within the landing gear operating envelope

      (2) When less than 20,000 feet and 225 KCAS:

      NOTE

      Landing gear extension results in the brake control unit doing a built-in test.

      (a) LANDING GEAR . . . DOWN

    4. If the brake pressure returns to normal (indicates zero pressure in flight):

    5. (1) Landing . . . Perform normal landing

    6. If the CAS message remains displayed:

    7. (1) Affected Set of Brakes . . . Identify (INBD or OUTBD)

      (2) Affected BRAKE CB / SSPCs . . . PULL and RESET
      OUTBD BRAKE CTRL: CPOP D-3
      INBD BRAKE CTRL: POP D-3

    8. If the CAS message is displayed, or if uncommanded brake pressure remains after CB has been reset:

    9. (1) Affected Brake CB / SSPCs . . . PULL
      OUTBD BRAKE CTRL: POP D-3
      INBD BRAKE CTRL: CPOP D-3

      NOTE

      Landing distance and maximum landing weight due to brake energy limits will be affected.

      (2) Landing Distance . . . Recalculate with a 1.65 factor

      (3) Maximum Landing Weight . . . Recalculate with a 0.8 factor

      (a) Refer to 05-11-20, Tire Speed and BKE Limited Maximum Landing Weight, Figure 5.

      (4) Runway Select longest available with most favorable winds

    10. Landing

    11. (1) Reverse Thrust . . . Apply maximum

      (2) Brakes . . . As required

  2. On Ground

    1. a. Brake Pedals . . . Apply and Release

    2. PARKING BRAKE . . . Apply and Release

    3. If the CAS message remains displayed:

    4. (1) Airplane . . . Do not taxi

References

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

Revision: 2019-04-18
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