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nections, and neutralizing and cleaning off any spilled
electrolyte or corrosion. Use bicarbonate of soda
(baking soda) and clean water to neutralize electro-
lyte or corrosion. Follow with a thorough flushing
with clean water. Do not allow bicarbonate of soda
to enter battery as it will neutralize electrolyte and
can permanently damage battery. Brighten cable
and terminal connections with a wire brush, then
coat with petroleum jelly before connecting. Check
the battery every 50 hours (or at least every 30
days), oftener in hot weather.
Add only distilled
water, not acid or "rejuvenators," to maintain elec-
trolyte level in the battery. Inspect the battery box
and clean, remove any evidence of corrosion.
CAUTION
This aircraft is equipped with alternators and
a negative ground system. Observe proper
polarity.
Reverse polarity will damage
electrical components.
2-19. TIRES should be maintained at the air pres-
sure specified in the chart of Section 1. When check-
ing tire pressure, examine tire for wear, cuts,
bruises, and slippage.
NOTE
Recommended tire pressure should be main-
tained.
Especially in cold weather, remem-
ber that any drop in temperature of the air
inside a tire causes a corresponding drop in
pressure.
2-20. NOSE GEAR STRUT.
The nose gear strut
requires periodic checking to ascertain that the strut
is filled with hydraulic fluid (Federal Specification
MIL-H-5606) and is inflated to the correct air pres-
sure. When servicing the nose gear strut proceed
as follows:
a. Remove valve cap and reduce air pressure to
zero.
b. Remove valve housing assembly.
c. Telescope gear strut to its shortest length and
fill to bottom of filler hole with MIL-H-5606 hydrau-
lic fluid.
d. Lift nose of airplane, extend and compress strut
several times to expel any entrapped air, then lower
nose of airplane and repeat step "c."
e. Install valve housing assembly and inflate strut
to 50 psi with nose wheel off ground (strut extended).
NOTE
Keep the nose gear shock strut, especially
the exposed portion of the strut piston, wiped
off with a clean dry cloth to remove dust and
grit which may cut the seals in the strut bar-
rel
Do not wipe the strut with hydraulic fluid,
since this tends to collect even more dust and
grit.
2-21. NOSE GEAR SHIMMY DAMPENER.
The
shimmy dampener should be serviced at least every
100 hours.
The dampener must be filled completely
with fluid, free of entrapped air, to serve its purpose.
To fill or add fluid to shimmy dampener while in-
stalled on airplane:
a. Remove filler plug from dampener.
b. Using a tow-bar, turn nose gear in the direction
that places the dampener piston at the end opposite
the filler plug.
c. Fill with MIL-H-5606 hydraulic fluid.
d. Install and safety filler plug.
To fill shimmy dampener when it is removed from
airplane, proceed as follows:
a. Remove filler plug from dampener.
b. Submerge dampener in MIL-H-5606 hydraulic
fluid and work dampener piston shaft in and out to
remove any entrapped air and ascertain complete
filling of cylinder.
c. Reinstall plug before removing dampener from
hydraulic fluid.
NOTE
Keep the shimmy dampener, especially the
exposed portions of the dampener shaft, wiped
off with a clean cloth to remove dust and grit
which may cut the seals in the dampener bar-
rel Do not wipe the shaft with hydraulic
fluid, since this tends to collect even more
dust and grit.
2-22.
HYDRAULIC BRAKE SYSTEMS should be
checked for the correct amount of fluid at least
every 100 hours. Add MIL-H-5606 hydraulic fluid
at the brake master cylinders. Bleed the brake sys-
tem of entrapped air whenever there is a spongy
response to the brake pedals.
2-23. OXYGEN CYLINDER.
Some airplanes are
equipped with an optional oxygen system. The oxygen
cylinder should be refilled when oxygen system pres-
sure is below 300 psi. When fully charged the oxygen
cylinder contains 48 cubic feet of oxygen at 1800 psi
at 70°F.
NOTE
The oxygen system is equipped with a filler
valve so the system may be refilled without
removing the oxygen cylinder. If the oxygen
cylinder is to be refilled by a commercial
oxygen supplier, the following procedure may
be accomplished.
a. Remove access panel on right rear of fuselage.
WARNING
Do not permit smoking or open flame in or
near airplane while work is performed on
oxygen system, or when the system is in
operation.
Guard against inadvertently turn-
ing master switch on.
b. Close cylinder shut-off valve by turning full
clockwise.
c. Disconnect oxygen lines from cylinder.
d.
Loosen clamps securing cylinder and remove
cylinder.
2-6
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