Beechcraft C-12C Operator And Technical Reference Manual page 149

AMBIENT
TEMPERATURE
(°F)
+30° and above
+20°
+10°
0°
-10°
-20°
-30°
NOTES:
1. Use anti-icing and deicing fluid (MIL-A-8243 or MIL-F-5566).
2. Heat mixture to a temperature of 82° to 93°C (180° to 200°F).
4. If tires are frozen to ground, use undiluted
defrosting fluid to melt ice around tire.
Move aircraft as soon as tires are free.
2-113. APPLICATION OF EXTERNAL POWER.
Before connecting the power cables from
the external power source to the aircraft,
ensure that the GPU is not touching the
aircraft at any point. Due to the voltage
drop in the cables, the two ground systems
will be of different potentials. Should they
come in contact
operating, arcing could occur. Turn off all
external power while connecting the power
cable to, or removing it from the external
power supply receptacle. Be certain that
the polarity of the external power source is
the same as that of the aircraft before it is
connected.
Do not charge battery with GPU.
An external source is often needed to supply the
electric current required to properly ground service the
aircraft electrical equipment and to facilitate starting
the aircraft's engines.
receptacle is installed on the outboard side of the right
engine nacelle.
Table 2-16. Recommended Fluid Dilution Chart
PERCENT
DEFROSTING FLUID
BY VOLUME
20
30
40
45
50
55
60
CAUTION
while the GPU
An external dc power
PERCENT WATER
BY VOLUME
80
70
60
55
50
45
40
2-114. SERVICING OXYGEN SYSTEM.
The oxygen system furnishes breathing oxygen
to the pilot, copilot, and passengers.
shows the location of oxygen cylinder.
a. Oxygen System Safety Precautions.
Keep fire and heat away from oxygen
equipment. Do not smoke while working
with or near oxygen equipment, and take
care not to generate sparks with carelessly
is
handled tools when working on the oxygen
system.
1. Keep
gauges, valves, fittings, masks, and all
other components of the oxygen system
free of oil, grease, gasoline, and all other
readily combustible substances.
utmost
servicing, handling, and inspecting the
oxygen system.
2. Do not allow foreign matter to enter
oxygen lines.
3. Never allow electrical equipment to come
in contact with the oxygen cylinder.
4. Never use oxygen from a cylinder without
first reducing its pressure through a
regulator.
TM 1-1510-218-10
FREEZING POINT OF
MIXTURE (°F)
(APPROXIMATE)
+10°
0°
-15°
-25°
-35°
-45°
-55°
Figure 2-33
WARNING
oxygen regulators,
care shall be exercised
cylinders,
The
in
2-133