ALTERNATING CURRENT (AC) POWER DISTRIBUTION
APU GENERATOR OPERATION
When the APU generator is operating, dc voltage is
applied to APU generator slave relay 241K4 through
contacts of No. 1 and No. 2 generator contractors
241K1 and K2. When 241K4 is energized, it puts dc
voltage at the GEN APU switch on the overhead panel,
It also energizes external power contactor 241K5 with
28 vdc from the essential bus.
NO BREAK - WORK HARDER
Placing the GEN APU switch to ON energizes
generator contactor 241K3 to allow 115 vac from the
APU generator to power the No. 1 and No. 2 ac buses.