Cessna 150M - Vacuum System Filter; Battery; Tires; Tie-Down Details

NOTE
The
filter assembly may be cleaned with com-
pressed air a maximum of 30 times or it may
be washed a maximum of 20 times. A new
filter should be installed after using 500 hours
of engine operating time or one year, whichever
should occur first. However, a new filter should
be installed at anytime it is damaged. A damaged
filter may have sharp or broken edges in the fil-
tering panels which would allow unfiltered air to
enter the induction system. Any filter that ap-
pears doubtful, shall have a new filter installed
in its place.
d. After washing, rinse filter with clear water un-
til rinse water draining from filter is clear. Allow
water to drain from filter and dry with compressed
air (not over 100 psi).
NOTE
The
filtering panels of the filter may become
distorted when wet, but they will return to
their original shape when dry.
e. Be sure air box is clean, inspec t filter. If fil-
ter is damaged, install a new filter.
f. Install filter at entrance to air box with gasket
on aft face of filter frame and with air flow arrow
on filter frame pointed in the correct direction.
2-23. VACUUM SYSTEM FILTER. The vacuum sys-
tem central air filter keeps dust and dirt from enter-
ing the vacuum operated instruments. Change central
air filter element every 500 hours of operating time
and whenever suction gage reading drops below 4.6
inches of mercury. Also, do not operate the vacuum
system with the filter removed, or a vacumm line
disconnected as particles of dust or other foreign
matter may enter the system and damage the gyros.
2-24. BATTERY. Battery servicing involves adding
distilled water to maintain the electrolyte level even
with the horizontal baffle plate or split ring at the bot-
tom of the filler holes, checking cable connections,
and neutralizing and cleaning off any spilled electro-
lyte or corrosion. Use bicarbonate of soda (baking
soda) and clean water to neutralize electrolyte or
corrosion. Follow with a thorough flushing with
clean water. Do not allow bicarbonate of soda to en-
ter battery. Brighten cable and terminal connec-
tions with a wire brush, then coat with petroleum
jelly before connecting cables, 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 electrolyte level in
the battery. Inspect the battery box and surrounding
area and clean and remove any evidence of corrosion.
Refer to Section 16 for detailed battery removal, in-
stallation, and testing.
2-25. TIRES. Maintain tire pressure at the air
pressure specified in figure 1-1. When checking
tire pressure, examine tires for wear, cuts, bruises,
and Slippage. Remove oil, grease and mud from
tires with soap and water.
Figure 2-3. Tie-Down Details
2-8