Beechcraft C-12C Operator And Technical Reference Manual page 839

To reset, turn
5 seconds, then ON.
When voltage drops below approximately
20 volts, the red anticollision light may
become inoperative.
8-28. BEFORE TAXIING.
1. BLEED AIR VALVES – As required.
*
2. BRAKE DEICE – As required. To activate
*
the brake deice system, proceed as follows.
a. BLEED AIR VALVES – OPEN both.
b. CONDITION levers – HIGH IDLE.
c. BRAKE DEICE switch – DEICE on.
Check BRAKE DEICE light illuminated.
Once brakes have
CONDITION lever may be returned to LOW
IDLE.
Brake deice control valves may become
inoperative if valves
periodically. One cycle of the valves is
required daily,
conditions.
3. CABIN TEMP MODE and temperature
*
switches – Set as desired.
For maximum cooling on the ground, turn
the BLEED AIR VALVE switches to ENVIRO
OFF position.
4. AC/DC power – Check as follows:
a. AC frequency – 394 - 406 Hz.
b. AC voltage – 104 -124 Vac.
c. DC load – 85% maximum per generator.
d. DC voltage – 28 - 28.5 Vdc.
5. AVIONICS MASTER POWER switch – ON.
*
NOTE
OFF approximately
NOTE
been deiced,
are not cycled
regardless of weather
NOTE
Do not operate radar in congested areas.
Do not operate the weather radar system in
a confined space where the nearest metal
wall is 50 feet or less from the antenna
reflector.
50 feet of the antenna reflector may
damage receiver crystals.
6. Avionics controls – As required.
*
The radar system should be tested before
each flight on which the system is to be
used.
immediate area of the aircraft, the system
should be left in the STBY position.
7. Electric elevator trim, autopilot/flight director
the
operation
that an autopilot check is required, check as
follows:
a. Pilot and copilot PITCH TRIM switches –
b. DISC TRIM switch – Press to second
c. Flight Director (FD) and Radio Magnetic
Since the pressure of airflow that normally
opposes movement of control surfaces is
absent during preflight check, it is possible
to get
deflection if an autopilot command is
allowed
appreciable length of time. Move turn knob
and pitch thumbwheel only enough to
check operation, then return them to the
center position.
d. Select HDG mode – Check.
WARNING
CAUTION
Scanning such surfaces within
NOTE
If no significant weather is in the
C D1 – When PC determines
Press to NOSE UP and NOSE DN
positions, singularly and in pairs. Check
that trim wheel moves in proper direction
and operates only when trim switches
are pressed in pairs.
requires that electric elevator trim be
turned off and flight conducted using only
manual trim.
detent and verify that electric trim
disconnects and that ELEC TRIM light
extinguishes.
Indicator (RMI) warning flags masked –
Check.
NOTE
a hard over control
to remain active
TM 1-1510-218-10
Any deviation
surface
for any
8-13