LANDING
GEAR
Manual System
The landing gear of the Mark
21
is unique in that it is manually
retracted by the pilot by means of a lever in the cabin. The
sys-
tem
is
operated by direct mechanical linkage and has proven
to
be
one of the most reliable and maintenance-free retraction
systems available. An electrically powered
landing gear retrac-
tion system is also available at extra cost and is described in
the following section.
The manual
systeln is aided by bungee type springs in the fuse-
lage and assist springs in the wing, which balance the weight of
the gear. Rubber discs are used for shock absorption in the
welded steel tube gear structure. Grease fittings are provided
at certain important lubrication points on the landing gear.
The position of the gear is indicated by lights on the panel
which will warn of an unlocked condition. These lights may be
din~n~ed by rotating the lens housing to prevent glare at night.
Press the lens housing
in to test the bulbs. The red indicator
light will come on if the handle on the retraction
lever
is
nos
sufficiently engaged in
the down and locked position, thereby in-
dicating an unsafe-to-land condition. The green light indicates
that the handle is properly engaged
in
the down position,
and
the
gear
is
in the landing configuration.
A
thumb operated latch
is
provided on the down socket to prevent unlocking of the gear
when
it
is
clown unless
it
is
deliberat&y releas&.
To retract the gear, depress the safety latch button and slide
the gear handle
from the down-lock socket. Move the handle
rapidly to the floor between the seats. Slide the gear handle into
the up-lock socket, and the operation
is
complete. The more
rapid the movement of the handle, the easier
it
is
to retract the
gear. The gear retracts easiest at
low
airspeeds.
1.0
lower the gear, slide the gear handle from the up-lock socket
ar~d rnove the handle forward to the instrument panel. Slide the
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