4B-16 Developed for Training Purposes Leerjet 35/36
February 1998
CAE SimuFlite
AC System
Two 1,000VA static inverters (primary and secondary) supply
115V AC, 400 Hz power to the Left and Right AC buses. An
auxiliary 1,000VA inverter (if installed) supplies 115V AC, 400
Hz power if one of the primary inverters fails.
Autotransformers, powered by the Left and Right AC buses,
supply 26V AC power for avionics equipment, the oil pressure
gages, and the anti-skid system.
With the Left and Right Generator buses powered, placing the
INVERTER PRI and INVERTER SEC switches in the ON posi-
tion energizes the primary and secondary inverters’power
relays through overload sensors. After the power relays close,
28V DC from Left and Right Generator buses power the pri-
mary and secondary inverters. Inverter output then flows
through the inverter paralleling control box to the Left and Right
AC buses.
With both inverters operating, the inverter paralleling control
box equalizes the loads and frequency balance between the
two inverters.
If an overload condition occurs, the associated inverter’s over-
load sensor circuit breaker opens to de-energize the power
relay. When the power relay opens, the inverter loses its 28V
DC power input. Resetting the circuit breaker restores DC input
to the inverter by closing the power relay.
On aircraft with the optional auxiliary inverter installed, if the pri-
mary or secondary inverter fails (PRI INV or SEC INV annunci-
ator illuminated), placing the auxiliary inverter switch in the ON
position energizes the auxiliary inverter’s power relay. The
relay closes so that 28V DC from the Battery Charging bus
powers the auxiliary inverter. Placing the AUX INVERTER
switch in L BUS or R BUS position directs 115V AC from the
auxiliary inverter to the respective AC bus.
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