Table 2-12. Recommended Fluid Dilution Chart
FREEZING POINT OF
FLUID BY VOLUME
30° and above
Notes: 1. Use anti-icing and deicing fluid (MIL-A-8243) or commercial fluids.
2. Heat mixture to a temperature of 82° to 93°C (180° to 200°F).
2-100. APPLICATION OF EXTERNAL POWER.
Before connecting the power cables
from the external power source to the
aircraft, insure 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
while the GPU is 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. Minimum GPU
requirement is 400 amperes continuous
and 1800 amperes for one tenth of a
An external power source is often needed to supply the
electric current required to properly ground service the aircraft
electrical equipment and to facilitate starting the aircrafts
engines. An external DC power receptacle is installed on the
(outboard side of' the right engine nacelle. An external A(,
power receptacle is installed on the outboard side of' the left
2-101. SERVICING OXYGEN SYSTEM.
The oxygen system furnishes breathing oxygen to the
pilot, copilot and first aid position. Oxygen cylinder location is
shown in figure 2-20.
a. Oxygen System Safety Precautions.
Keep fire and heat away from oxygen
equipment. Do not smoke while
equipment, and take care not to
generate sparks with carelessly handled
tools when working on the oxygen
(1) Keep oxygen regulators, cylinders, gages,
valves, fittings, masks, and all other components of the oxygen
system free of oil, grease, gasoline, and all other readily
combustible substances. The utmost care shall be exercised in
servicing, handling, and inspecting the oxygen system.
(2) Do not allow foreign matter to enter
(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.
Replenishing Oxygen System.
Remove oxygen access door on outside of'
aircraft (fig. 2-20.
Remove protective cap on oxygen system filler
Attach oxygen hose from oxygen servicing unit
to filler valve.