The air filter should be removed and cleaned every 25 hour?.
or more often if unusually dusty conditions ate encou~ntred.
The engine oil should be drained and replaced and the oil screens
cleaned every 50 flight hours.
1,ycoming recoiii~nends the use of
ashless dispersant type oil for the following outside air temper-
atures
:
Above
40'
F,
(4O
C.)
SAE
50
Below
40'
F,
(4O
C.)
SAE
30
Eelow
10'
F.
(-12'
C.)
SAE
20
Enco E80 and Aero She'll W are approved types. Oil capacity
is
eight quarts
-
six t-niriirnuiil for flight.
The battery should be checked every
25
hours of flight or every
30 days (whichever coines first) for proper fluid level. The bat-
tery of the Mark
21
is located on the forward left side of the
firewall and
is
easily accessible through the access panel on
the left engine cowling.
CARE
OF
INTERIOR
Normal cleaning methods rnay be used for routine cleaning of
the Mark 21 interior. The fabric on the seats and side panels
may be cleaned with any spray-on type dry cleaner. The vinyl
plastic and Royalite plastic used on the seats, side panels and
headliner
nlay be cleaned with a damp cloth or soap and water.
Do not use alcohol on Royalite plastic.
CARE
OF
EXTERIOR
The acrylic enamel paint used on the Mark 21 does not require
waxing. However, if you desire to wax the exterior, a period of
90
days since the airplane was painted should be allowed before
waxing to insure proper curing of the paint. When washing the
Mark 21, do not use detergents. Do not use a cornbination cleaner
and wax on the exterior.
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