2. Remove oil filler cap.
permit protective covers to be removed with a minimum
of sticking. To prevent freezing rain and snow from
3. Insert a clean funnel, with a 100 micron screen
blowing under protective covers and diluting the fluid,
incorporated, into the filler neck.
insure that protective covers are fitted tightly. As a
deicing measure, keep exposed aircraft surface wet with
4. Replenish with oil to within 1 quart below MAX
fluid for protection again frost.
mark on dipstick.
5. Check oil filler cap for damaged preformed
packing, general condition and locking.
Do not apply anti-icing, deicing and
defrosting fluid on exposed aircraft
6. Secure oil filler cap.
surfaces if snow is expected. Melting
snow will dilute the defrosting fluid
7. Check for and remedy any oil leaks.
and form a slush mixture which will
freeze in place and become difficult
2-88. Servicing Hydraulic Brake System Reservoir.
1. Gain access to brake hydraulic system reservoir
2-91. Anti-icing, Deicing and Defrosting Treatment.
Use undiluted anti-icing, deicing and defrosting fluid
(MIL-A-8243) to treat aircraft surfaces for protection
against freezing rain and frost. Spray aircraft surface
The hydraulic brake system reservoir
sufficiently to wet area, but without excessive drainage.
for the aircraft is located on the right
A fine spray is recommended to prevent waste. Use
side of the bulkhead in the nose
diluted, hot fluid to remove ice accumulations.
1. Remove frost or ice accumulations from aircraft
2. Remove brake reservoir cap and fill reservoir to
surfaces by spraying with diluted anti-icing, deicing, and
washer on dipstick with hydraulic fluid.
defrosting fluid mixed in accordance with table 2-7.
3. Install brake reservoir cap.
2. Spray diluted, hot fluid in a solid stream (not
over 15 gallons per minute). Thoroughly saturate aircraft
2-89. Inflating Tires.
surface and remove loose ice. Keep a sufficient quantity
of diluted, hot fluid on aircraft surface coated with ice to
Inflate tires as follows:
prevent liquid layer from freezing. Diluted, hot fluid
should be sprayed at a high pressure, but not exceeding
1. Inflate nose wheel tire to a pressure between 50
and 55 PSI. (For very soft field takeoffs, nose wheel tire
pressure should be between 30 and 32 PSI.)
3. When facilities for heating are not available and
it is deemed necessary to remove ice accumulations
2. Inflate main wheel tires to a pressure between
from aircraft surfaces, undiluted defrosting fluid may be
49 and 55 PSI for 12 ply tires.
used. Spray undiluted defrosting fluid at 15 minute
intervals to assure complete coverage. Removal of ice
2-90. Anti-icing, Deicing and Defrosting Protection.
accumulations using undiluted defrosting fluid is
expensive and slow.
The aircraft is protected in subfreezing weather by
spraying the surfaces (to be covered with protective
covers) with defrosting fluid. Spraying defrosting fluid on
aircraft surfaces before installing protective covers will