Turn off radio and electrical switches before starting APU.
Before starting APU.
Ensure hydraulic SYSTEM SELECTOR control lever is on MAIN (see para. 2-1b(3)).
Check hydraulic POWER level for OFF (see para. 2-1b(5)).
Turn MASTER switch on and FUEL PUMP switch OFF (see para. 2-1e).
Check APU GEN switch (1) for OFF.
Turn FUEL SHUTOFF switch (2) to ON. LOW OIL PRESS light (3) will come on and stay on until
PREHEAT switch (4) is kept on until engine starts.