Mooney M20M - Manual Emergency Gear Extension System; Finalchecks; Trouble Shooting

SERVICE
AND
MAINTENANCE
MANUAL
M20M
MOONEY
AIRCRAFT CORPORATION
At
full
extend,
the
length
of
cable should
be
29"
2.
Move
landing
gear
control
switch
to
DOWN
minimum.
In retracted
position,
cable
length
should
be
position.
5"
to
8"
long.
3.
Push
latch
forward
with
right
thumb.
NOTE
4.
Pull
RED
lever
back
and
upward
(engaging
Cable
length
in
retract
position
may
be
adjusted
manual
extension
system).
shorter
or
longer
by
holding
clutch
with the
finger
of
one
hand
(to
prevent
shaft
rotation),
5.
Pull ’7" handle
up
and
return
to
original
position
and
then
with
the
other
hand,
rotating pulley
and continue
until
green
gear-down
indicator
light
is
illuminated
and/or
lines
on
visual
gear
position
housing
one
(1)
full
turn
CW
(10 shorten)
or
indicator
on
floor
aft of console
are
aligned
when
CCW
(to
lengthen).
Retention
of
clutch with
finger
will
not
allow
pretensioning
of
springs.
viewed
from
directly
above
the indicator
(this
will
Slight
spring
tension should be
noted
starting
normally
take
12
to
20
pulls).
at
8"
to
10".
CAUTION
10.
Bronze
clutch
(13)
should
be
inspected
for
DO
NOT
operate
landing
gear
electrically
with
damage
or wear
at
slot
where
gear
assemble
engages
manual
extension
system
engaged.
Landing
during
manual extension
of the
landing
gear.
gear
actuator
C/B
will
pop
out.
11.
If
damaged
or
worn,
remove
pin
(11)
from
CAUTION
disengage
arm
(12)
and
slide
disengage
arm
out
so
DO
NOT
continue
to
pull
T-Handle after
GEAR
bronze
clutch
(13)
can
be
pulled
from
its
driveshaft.
DOWN
light
is
ON.
Actuator
may
bind
on
Down
Stops.
12.
Replace
bronze
clutch
and
reassemble
disengage
arm
into
recoiler
assembly.
32-30-08
FINAL CHECKS
13.
Attach
clutch
recoiler
assembly
to
actuator
gear
1.
Raise
and
lower
landing
gear
through
five
housing
with
the
four
(4)
screws
removed
in
32-30-05
complete cycles,
pausing
after each
cycle
to
check
(supplied
in
clutch
spring
kit).
required
tolerances
and
dimensions,
and
annunciator
light
indications. Make
certain
that
no
bungee springs
32-30-07
MANUAL
EMERGENCY
GEAR
are
compressed
to
solid
height,
and that
nose
gear
tire
EXTENSION
SYSTEM
clears
top
of
wheel
well
a
minimum
of
.25
in.
when
The
manual
emergency gear
extension
system
is
used
landing
gear
is
retracted. Make
adjustments
per
above
to
extend
gear
only.
The controls
are
in
the
floorboard
procedures,
as
required,
to
correct
any
deficiencies.
aft
and
between
the front
seats.
To
manually
extend
2.
Retorque
all
jam
nuts.
the
gear:
3.
Reattach main
and
nose
landing
gear
door
links.
1.
Pull
landing
gear
actuator
C/B.
Check
to
see
that
main
and
nose
landing
gear
doors
are
still
rigged
per
paragraph
32-10-03
and
32-20-03.
32-31-00
TROUBLE
SHOOTING LANDING
GEAR SYSTEM
TROUBLE
PROBABLE
CAUSE
REMEDY
Incomplete
Retraction.
Gear
Bind
in
gear
retraction
system
Refer
to
landing
gear
rigging
retracts
to
an
intermediate
because
gear
is
out
of
rig.
procedure.
Examine
all
movable
parts
position
and
stops
short.
Malfunction
in
gear
electrical
for
proper
lubrication
and freedom
from
circuit,
inoperative
actuating
binding.
Check
for
actuator
worm
gear
motor,
or
weak
battery.
binding
and
lubricate
as
needed.
Any
malfunction
can cause
the
landing
gear
circuit
breaker
to
trip:
therefore
check
electric
circuit
for
loose
connection,
broken
wires
or
defective
relay
switches.
Recharge
battery.
Oversized/Stretched
tire
will
not
Replace
tire
with smaller diameter tire.
go
into
wheel
well
properly.
Gear
will
not
retract
at
61
to
70
Insufficient
airspeed.
Pressure
Check
pitot
tube
and line for
KIAS.
switch
inoperative.
Circuit
obstructions.
Examine
pressure
switch
breaker
tripped.
for
proper
adjustment
and
operation.
Reset
circuit breaker.
Does
gear
retract
using
override
check
system
operation.
Gear
will
not
retract
at
61
to
70
Actuator
ball
nut
binding
on
Gear
may
have
been extended
KIAS
(con’t.)
mechanical
DOWN
STOPS.
manually
8
ball
nut
is
jammed tight
against
STOPS
on
motor;
use
wrench
on
ball
nut
flat
to
move
off STOPS.
32-30-07
4-99
16
OLDWILLWAYNE