Essential DC Bus on Battery Power

Gulfstream GVII

Eddie sez:

There isn't much here other than the AFM procedure. I'll give this more thought when I get a chance.

Everything here is from the references shown below, with a few comments in an alternate color.

Last revision:

20191019

AFM Procedure

[AFM, §03-04-60]

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Corrective Action

  1. AC / DC RESET Switch . . . PRESS and RELEASE
  2. If the CAS message is displayed:
    1. MAIN BATTERIES (Left and Right) . . . ON
  3. In Flight
    1. Slip-skid Indicator . . . Centered
    2. RAT . . . Deploy
    3. NOTE

      Airspeed should not be reduced to less than 200 KCAS until it is necessary to land so as to ensure proper RAT operation.

    4. RAT GEN . . . ON
    5. EMERGENCY POWER . . . ARM
    6. MAIN BATTERIES and FCS BATTERIES . . . Monitor VOLTAGE / AMPS
    7. Final Approach
    8. NOTE

      RAT GEN will drop off line below approximately 200 KCAS. To prevent the RAT GEN from repeatedly shedding the load and then resupplying electrical power, the RAT GEN must be selected OFF prior to decelerating to less than 200 KCAS.

      (1) FLAPS . . . 20°

      (2) RAT GEN . . . OFF (above 200 KCAS)

      (3) FLAPS . . . 39°

  4. If a go-around is necessary:
    1. RAT GEN . . . ON (above 200 KCAS)

Gulfstream GVII-G500 Airplane Flight Manual, Revision 4, August 29, 2019

Gulfstream GVII-G500 Production Aircraft Systems, Revision 3, July 15, 2019