Mooney M20K - General; Main Landing Gear and Doors

SERVICE
AND
MAINTENANCE
MANUAL
M20K
MOONEY AIRCRAFT CORPORATION
32-00-00
GENERAL
pedals.
@ual
brake
system
is
optional
for
co-pilots).
In-
dividual
wheel
brakes
are
avanaale
by depressing
The
landing
gear
is
operated
by
an
electn’cal motor
either left
or
right
pedal. Parking
brakes
are
actuated
driven
actuator.
The
travel
during
the
extend
and
by
depressing
both brake
pedals
and
pulling
the
park-
retract
cycle
is
controlled
by
down
and
up
limit
ing
brake
control
caMe
knob.
This
cable
actuates
a
switches
located
beneath
the
ffoorboard
under
the
lever
on
the
parking
brake
valve
and
traps
the
pilots
seat.
Power
is
supplied
to
the
actuator
through
a
hydraulic
fluid
from the
valve
to
the
wheel
cylinders
set
of
relays
actuated
by
the
gear
selection
switch.
The
thus
holding
the
pucks
to
the
discs.
Release
the
park-
gear
selection
switch
is located at
the
top
of
the instru-
ing
brakes
by
pushing
the
parking
brake
knob
in. This
ment
panel
in
front
of
the
pilot.
The
actuator
worm
releases
hydraulic
pressure
at
the
wheel
cylinders
and
gear
barrel nut
is
connected
to
the
retract
bellcrank
therefore
releases the brake
discs.
which
Is
connected
to
push-pull
retract
tubes
and
bellcranks
throughout
the
entire
retraction
system.
An
32-10-00
MAIN
LANDING GEAR
AND
DOORS
airspeed
safety
switch
is
mounted
to
the
back of
the
32-10-01
MAIN
GEAR
REMOVAL
airspeed
indicator
and
incorporated
into the
landing
gear
electrical
circuit
to
prevent
landing
gear
retraction
1.
Raise
aircraft
on
jacks.
while
on
the
ground
until
a
safe
takeoff
speed
is
2.
Partially
retract
gear
as
described
in
Section
32-
reached.
A
by-pass
switch
is
installed
adjacent
to
the
60-01,
pam
1.
gear
selection
switch
in
order
to
override
the
safety
3.
Disconnect
gear
door
links
and brake
lines.
Cap
switch
circuitry
if the
gear
does
not retract.
all lines
and
fittings.
4.
Remove
gear
door(s)
and
mud
guard
(if
desired).
The
gear
legs
are
constructed
of
welded
chrome-
5.
Detach
main
gear
retracting
tube
M, (Ftgure
32-
mdybdenum
tubular
steel,
heat
treated
for
greater
9)
from
retracting
truss
(G),
and
remove
bolts
(H)
from
strength
and
wear
resistance.
Main
gear
attaching
retracting
truss
mounting
Mock.
points
have
bushings
installed
in
the
gear
mounting
6.
Remove
small
skin
panel
covering
aft
trunnion
box
attached to
the
wing
spar.
The
steerable
nose
gear
bearing
(25-1000
thru
25-TEA).
mounts
to
the cabin
tubular
steel
frame.
NOTE
NOTE Steps
7
thru
9
apply
to
250001
thru
250999
only.
Heat
treated
components
should
NOT
be
repaired;
replace
them.
7.
Remove
grease
fittings
from
forward
gear
support
trunnion-shaft
bearing.
The
main
gear
wheels have
hydraulic
disc
brakes
with
8.
Retract
gear
by
hand
until
a
2 inch thick
wood
a
parking
brake
valve
incorporated
into the
system.
Mock
(C),
(Figure
32-1),
can
be
inserted,
as
shown,
to
hold
gear
in
retracted
position.
Rubber
discs
in
the
gear
leg
assemblies
absorb the
A
Remove
cotter
key
and
nut
at
(F)
from
spring
shock
of
landing
and
taxiing.
connecting
link
(D),
(Figure
32-1).
MANUAL-EMERGENCY
LANDING
GEAR
SYSTEM.
Emergency
gear
extension
is
available
through
a
manual
ovenide
system.
This
system
is
bunt
into
the
.03
IN.
actuator
unit. The
disengage
controls
are
located
aft
.13
IN.
E
and between
the
front
seats.
F
LANDING GEAR
WARNING
SYSTEM.
The
landing
gear
warning
system
provides
the
pilot
down and
locked
when the
throttle is
retarded
beSow
with
an
audiMe
warning
that
the
landing
gear
is
not
10
inches
manifold
pressure
on
S/N
25-0001
thru
25-
I
0780.
The
waming
system
on
aircraft
S/N
25-0781
I
ON is activated
when the
throttle
is
retarded
below
16
to 18
inches
MP.
When
the
landing
gear
is down
and
locked the electrical
circuit is
opened
and
the
intermit-
Yi-it~-B
tent
hom is
stopped.
This
warning
switch is
mounted
on
the
throttle
housing
forward
of the
instrument
panel
and
can
be
adjusted
for the
proper
setting by
loosen-
Ing
the
screw
and
repositioning
the
switch.
BRAKE
SYSTEM.
GEAR
RETRACIION
SPRING
REMOVAL
The brake
system
is
hydraulically
operated
by
depress-
FIGURE
32
1
ing
the
brake
pedals
mounted
on
the
pilots
rudder
32-00-00
OLDWILLWAYNE