Cessna 150 Series Service Manual page 21

use of dirty or damage air filter than is generally
the filtering panels, which will allow unfiltered
believed. The frequency with which the filter should
air to enter the induction system. Any filter that
be removed, inspected, and cleaned will be determined
appears doubtful, shall have a new filter
primarily by aircraft operating conditions. A good installed in its place.
general rule however, is to remove, inspect and clean
e. Install filter at entrance to air box with gasket on
the filter at least every 50 hours of engine operating
aft face of filter frame and with air flow arrow on filter
time and more frequently if warranted by by operating
pointed in the correct direction.
conditions. Some operators prefer to hold a spare
induction air filter at their home base of operation so
To service the dry type filter, proceed as follows;
that a clean filter is always readily available for use.
Under extremely dusty conditions, daily servicing of
NOTE
the filter is recommended. Two types of filters are
used. One is a flock-coated, oiled filter and the other is Paper induction air filters must be replaced at
a dry, paper -media filter.
intervals not exceeding 500 hours time-in-service
on the filter.
NOTE
a. Remove filter from aircraft.
The aircraft is equipped with the flock-coaled,
oiled filter when it leaves the factory. However,
NOTE
new filters ordered from Cessna Parts
Distribution (CPD 2) will be the dry, paper
Use care to prevent damage to filter element
media filter with an improved element.
when cleaning filter with compressed air.
To service the flock-coated, oiled filter, proceed as
b. Clean filter by blowing with compressed air (not
follows: over 100 psi) from the direction opposite of normal air
flow. Arrows on filter case indicate direction of
a. Remove filter from aircraft. normal air flow.
b. Wash filter thoroughly in solvent (Federal
Specification P-S-661 or equivalent). Wash with
CAUTION
soiled face down in solvent.
c. Drain and dry filter, then dip flock-coated screen
filter in the same grade of oil used in the engine and Do not use solvent or cleaning fluids to wash
allow excess oil to drain from the filter.
filter. Use only a water and household detergent
d. Be sure airbox is cleaned, inspect filter. If filter is solution when washing the filter.
damaged, install a new filter.
c. After cleaning as outlined in step "b," the filter -
NOTE
may be washed, if necessary, in a solution of warm
water and a mild household detergent. A cold water
A damaged filter may have broken filtering
solution may be used.
panels or the flock coating may be missing from
Change I 2-8A/(2-8B blank)