Left APU GEN switch selected ON.

  • The APU breaker closes.

  • Both BTBs remain closed powering Transfer
    Bus 1 and Transfer Bus 2.

  • The APU GEN OFF BUS light extinguishes.

  • The right SOURCE OFF light illuminates
    indicating that the right APU GEN switch has
    not yet been selected ON.

  • The External Power breaker opens and the
    previously selected source (Ground Power)
    is no longer connected.

  • The GROUND POWER AVAILABLE light
    illuminates.
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The sequence of bus switching in the Electrical System SGR is for illustrative purposes only  and is not meant to imply an approved procedure.
Electrical System SGR