
26-VAC Bus 2 and 26-VAC
Essential Bus
There are two transformers which convert AC
bus 2 and AC essential bus 115 VAC to 26
VAC and power the airplane flight instru-
ments. The 26-VAC bus 2 supplies the copi-
lot's instruments and the 26-VAC essential
bus supplies the pilot's instruments.
AC Utility Buses
There are two AC utility buses provided. One
is powered from AC bus 1; the other is pow-
ered from AC bus 2. The utility buses supply
power for customer-installed equipment under
two conditions:
1
With airplane weight on wheels and
flaps selected to 0, and any single
source of AC power available
2. With airplane airborne and any two
generators on line
Automatic load shedding of both utility buses
occurs in flight anytime only one generator is
on line.
ADG Control Unit
Checks the following two functional tests.
Lamp Test
When selected, will indicate that the BATT DI-
RECT BUS is powered.
Unit Check
• C o n t i n u i t y o f t h e U P L O C K S q u i b
Circuit
• Continuity of three transfer contactors
• Logic circuits
• Weight on wheel circuits
• Any 2 main generators on-line
FlightSafety Canada
L t é e
L t d .
CL-600-2B16 PILOT TRAINING MANUAL
CL 601-3A/R
2-11
FOR TRAINING PURPOSES ONLY
FAIL
ALTN
PRESS TO
TRANSFER
ESSENTIAL
AC POWER
Figure 2-13. Essential AC Power Panel
Figure 2-14. ADG Controls