Condition lever HIGH IDLE.
Propeller levers FEATHER (if required).
AC and DC GPU units Disconnect (check
aircraft external power and mission external power
Propeller levers Advance, then retard to feather
Power levers GROUND FINE.
Generator switches RESET, then ON.
To reset beacon light, turn off
approximately 5 seconds, then DAY
or NIGHT. When voltage drops below
approximately 20 volts, the beacon
light may become inoperative.
Beacon light Reset.
propellers in FEATHER due to lack of
air flow over oil cooler.
8-20. BEFORE TAXIING.
Brake deice Check and set as required. Ensure
both bleed air valves are open.
Cabin air mode and temperature switches Set as
For maximum cooling on the ground,
turn the bleed air valve switches to
PNEU ONLY position. Verify airflow
is present from aft cockpit eyeball
outlets to ensure sufficient cooling
for mission equipment.
AC/DC power Check for:
AC frequency 394 406 Hz.
AC voltage 104 124 VAC.
DC voltage 28 28.5 VDC.
'Avionics master power switch ON.
· Do not operate the weather radar
combustible materials are within
18 feet of the antenna reflector.
When the weather radar set is
frequency energy is emitted from
the antenna reflector, which can
have harmful effects on the
human body and can ignite
Do not operate the weather radar
system in a confined space where
the nearest metal wall is 50 feet from
the antenna reflector. Scanning
such surfaces within 50 feet of the
The radar system should be tested
before each flight on which the
system is to be used.
Weather radar Test and set as required.
Mission panel Set and checked as required.
Automatic flight control system Check as follows:
Pause a few seconds between each
step to allow time for the proper
Set alert controller more than 1000 feet
above altitude indicated on pilot's altimeter. The pilot's
altimeter alert annunciation should be extinguished.
Decrease the alert controller to within
1000 feet of the pilot's altimeter setting. The alert
annunciation should illuminate.
Decrease the controller to less than 250
feet above the pilot's altimeter setting. The alert
annunciation should extinguish.
Increase the controller to 300 + 50 feet
above the pilot's altimeter indication and check that the
alert annunciation illuminates.