Beechcraft C-12C Operator And Technical Reference Manual page 843

NOTE
Reduce PROP levers gently to the detent to
prevent the PROP RPM dropping abruptly
below 1600 RPM.
b. PROP levers aft gently to detent – Set.
c. Propeller RPM 1600 to 1640 – Check.
d. PROP levers – HIGH RPM.
6. Ice vanes – Check as follows, if vanes are
already extended, reverse steps a and b:
a. ICE VANE switches – EXTEND. Verify
torque drop, TGT increase, illumination
of VANE EXT light and visually confirm
the bypass doors are open. Maximum
allowable time for the complete operation
is 15 seconds – Check.
b. ICE VANE switches – RETRACT. Verify
return to original torque and TGT, VANE
EXT light extinguished, and visually
confirm the bypass doors are closed.
Maximum allowable
complete operation is 15 seconds –
Check
7. CONDITION levers – HIGH IDLE.
8. POWER levers – IDLE.
9. Anti-ice and deice systems – Check as
follows:
a. WSHLD ANTI-ICE switches – NORMAL.
Check PILOT
(individually) for loadmeter rise, then
OFF.
b. PROP deice – Check. When MANUAL
mode is selected, note rise on DC
loadmeter.
selected, monitor prop ammeter for
2 minutes and ensure the indicator
remains in the normal operating range
the entire time.
c. DEICE switch – SINGLE CYCLE AUTO.
Check for a drop in pneumatic pressure
and wing deice boots inflation and after
6 seconds for
pneumatic pressure.
10. Pneumatic System – Check as follows:
a. LEFT BLEED AIR VALVE switch – OFF.
b. Pneumatic pressure 12 to 20 psi –
Check.
c. L BL AIR OFF light on – Check.
time for the
and COPILOT
When AUTO mode is
a second drop
d. RIGHT BLEED AIR VALVE switch –
OFF.
e. L & R BL AIR OFF, L & R BL AIR FAIL
lights and MASTER WARNING light –
ON.
f. LEFT BLEED AIR VALVE switch –
OPEN.
g. L BL AIR OFF and L & R BL AIR FAIL
lights – OFF and pneumatic pressure at
12 to 20 psi – Check.
h. RIGHT BLEED AIR VALVE switch –
OPEN.
i. R BL AIR OFF light off – Check.
11. Pressurization system – Check and set as
*
follows:
a. CABIN DOOR caution light extinguished
– Check.
b. Vent windows closed – Check.
c. BLEED AIR VALVE switches – OPEN.
d. Cabin altitude 500 feet lower than field
pressure altitude – Set.
e. CABIN PRESS switch – TEST (hold).
f. CABIN
indication – Check, then release TEST
switch.
g. ACFT ALT – Set to pressure altitude
plus 200 feet.
h. RATE control – Set between 9 and
12 o'clock.
12. CONDITION levers – As required.
If windshield anti-ice is needed prior to
takeoff, use normal setting for a minimum
of 15 minutes prior to selecting high
temperature
preheating and minimization of effects of
thermal shock.
in
* 8-31. BEFORE TAKEOFF.
1. AUTOFEATHER switch – ARM.
2. BLEED AIR VALVES – As required.
3. FUEL panel – Check fuel quantity and
switches positions.
4. Flight and engine instruments – Check for
normal indications.
TM 1-1510-218-10
CLIMB gauge descending
NOTE
to provide adequate
8-17