Mooney M20M - General; Main Gear Removal

MOONEY AIRCRAFT
CORPORATION
M20M
SERVICE
AND MAINTENANCE
MANUAL
32-00-00
GENERAL
This releases
hydraulic
pressure
at
the
wheel
cylinders
and
therefore
releases
the
brake discs.
The
landing
gear
is
operated
by
an
electrical,
motor
driven,
actuator.
The
travel
during
the
extend and
32-10-00
MAIN
LANDING GEAR
AND
DOORS
retract
cycle
is
controlled
by
down
and
up
limit
switches located
beneath the
floorboard
under
the
32-10-01
MAIN
GEAR REMOVAL
pilots
seat.
Power
is
supplied
to
the
actuator
through
a
1.
Raise
aircraft
on
jacks.
set
of
relays
actuated
by
the
gear
selection switch.
The
gear
selection
switch
Is
located
at
the
top
of
the
2.
Partially
retract
gear
as
described
in
SECTION
instrument
panel
in
front
of the
pilot.
The
actuator
32-60-01,
pam.
1.
worm
gear
ball
nut
is connected
to
the
retract
bellcrank
3.
Disconnect
gear
door
links
and
brake lines.
Cap
which
is
connected
to
push-pull
retract
tubes and
,II lines
and
fittings.
bellcranks
throughout
the
entire retraction
system.
An
airspeed
safety
switch
is
mounted
to
the back of the
4.
Remove
gear
door
and mud
guard
(if
desired).
airspeed
indicator
and
incorporated
into
the
landing
5.
Detach
main
gear
retracting
tube
from
gear
electrical
circuit
to
prevent
landing
gear
retraction
retracting
truss
(G),
and
remove
bolts
from
while
on
the
ground
until
a
safe takeoff
speed
is
retracting
truss
mounting
block
(Figure
32-11).
reached.
A
by-pass
switch
is
installed
adjacent
to
the
6.
Remove
three
screws
from small skin
panel
gear
selection
switch
in
order
to
override
the
safety
covering
aft
portion
of
landing
gear
leg
trunnion
and
switch
circuitry
if
the
gear
does
not
retract,
bearing
bracket
from
bottom
of
wing.
Slide
panel
from
The
gear
legs
are
constructed of welded
chrome-molybdenum
tubular
steel,
heat
treated
for
position
to
gain
access
to
bracket
bolts.
greater
strength
and
wear
resistance.
Main
gear
7´•
Remove
six
mounting
bolts
(2)
from
rear
gear
leg
attaching
points
have
bushings
installed
in
the
gear
trunnion
shaft
mounting
block
assembly
(3)
8
(4)
at
mounting
box
attached
to
the
wing
spar.
The
steerable
stub
spat
(5).
Shims
(6)
may
fall
out.
nose
gear
mounts
to
the
cabin tubular steel
frame.
3.
Slide
aft
bearing
block
(4)
down.
(Fig.
32-1)
NOTE
9.
Slide
front
bearing
block
(3)
down/
aftand
remove.
Heat
treated
components
should
NOT
be
10.
Slide
gear
leg
assembly
(1)
aft until dear
of front
repaired; replace
them.
bearing
(7)
on
main
spar
(8).
Carefully
remove
gear
assembly
from
wing.
The
main
gear
wheels have
hydraulic
disc
brakes with
a
parking
brake
valve
incorporated
into
the
system.
11.
Identify position
of
all
components
removed,
and
Rubber
discs
in
the
gear
leg
assemblies absorb
the
DO
NOT
intermix
right
and left
gear
components.
shock of
landing
and
taxiing.
12.
DO NOT
attempt
to
repair
any
heat
treated
LANDING GEAR EMERGENCY
EXTENSION
component
of main
landing
gear
assembly.
SYSTEM.
Emergency
gear
extension
is
available
through
a
manual override
system.
This
system
is built into
the
actuator
unit.
Thedisengage
controls
are
located aft
and
between
the
front
seats.
LANDING GEAR
WARNING SYSTEM.
I
The
landing
gear
warning
system
provides
the
pilot
with
an
audible
warning
that
the
landing
gear
is
nod
INBD
down
and
locked
when
the throttle
is
retarded. The
waming
system
on
is activated when the
throttle
is
retarded
approximately
1/4
inch
from
idle Dosition.
When the
landing
gear
is
down
and
locj<ed
the
electrical circuit is
opened
and the intermittent horn is
stopped.
This
warning
switch
is
mounted
on
the
throttle
FWD
housing
forward of
the
instrument
panel
and
can
be
adjusted
for the
proper
setting
by
loosening
the
screw
and
repositioning
the switch.
C
BRAKE SYSTEM.
The brake
system
is
hydraulically
operated by
depressing
the brake
pedals
mounted
on
the
pilots
rudder
pedals. (Dual
brake
system
is
optional
cc-pilots).
Individual wheel brakes
are
available
by
depressing
either left
or
right
pedal. Parking
brakes
are
actuated
by
depressing
both brake
pedals
and
pulling
SMX32-7
the
parking
brake
control
cable
knob.
This
actuates
a
lever
on
the
parking
brake valve
and
traps
the
hydraulic
fluid
from the
valve
to
the
wheel
cylinders
thus
holding
the
pucks
to
the discs.
Release
the
GEAR
REMOVAL
FIGURE
32-1
parking
brakes
by pushing
the
parking
brake
knob
in.
4-99
32-00-00
OLDWILLWAYNE