WINDOWS
The Plexiglas windows of the Mark
21
should be kept clean and
waxed.
Reiiiove dirt or illud with your hand while flushing with
water. Do not rub the windows with a cloth or
chan~ois while
cleaning. After clea
ling, rinse and dry with a moist chamois.
Reiilove oil or grezse with a cloth soaked in kerosene. Do not
use solvents other than kerosene on Plexiglas. After cleaning,
polishing wax
n~ay be applied and rubbed lightly with a soft dry
cloth. Do not use a power buffer as the heat generated by it
inay
soften the surface of the windows.
'
LANDING
GEAR
The landing gear retraction systein should be rigged only by a
mechanic faiililiar with the gear rigging procedures of the hlark
21.
The landing gear should be kept free of iilud or ice to pre-
vent interference when retracted. If you
notice an unusual force
when operating the
inanual retraction system, return the lever
to the down and locked position and have the gear checked after
landing. The gear warning
horn ]?lay be checked in flight by
retarding the throttle with
the gear up. The horn should sound
at about ten inches
Hg manifold presswe.
The tire pressure (nose and ii~ain) shouldbemaintained at
30
PSI.
VACUUM
OPERATED STEP
The operation of the step may be checked easily on the ground
by starting the engine and maintaining sufficient engine speed
to turn off the "Low Vacuum" light while an observer checks
the step retraction.
'The step should retract slowly and s~noothly
into the fuselage. If there
is
evidence of binding as the step re-
tracts, the support blocks should be examined for alignment.
Lubricants should not be used since they tend to collect dirt
and may increase
frzion in cold weather.
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