Mooney M20M - Landing Gear Warning System; Airspeed Safety Switch Adjustment

MOONEY
AIRCRAFT
CORPORATION
M20M
SERVICE
AND
MAINTENANCE MANUAL
CAUTION
When
running
gear up
or
down
electrically
DO
NOT
use
circuit breaker
as
a
switch.
Partial
retraction
or
extension
may
be
accomplished
electrically
as
follows:
COLLAR
II I
1.
Place
Master Switch
in
OFF
position.
GEAR
2.
Move
gear
switch
to
GEAR UP
or
GEAR DOWN
TRUNNION
as
desired.
seno-
SPACER
PLUMB LINE
3.
Momentarily
actuate
Master Switch
until
gear
is in
desired
position.
3260-02
LANDING GEAR
WARNING
SYSTEM
The
landing
gear
warning
system
consists
of:
1.
Landino
gear
position lights:
"GEAR
SEE
DOWN"-GREE~N
light
on
annunciator
and
WHITE
"1*
indicator
light
on
Roor
"GEAR
UNSAFE" RED
light
on
annunciator
Gear
is in
transit,
UP
or
down;
GEAR
UP-nolights.)
CENTER
LINE
2.
A
warning
horn in cabin is
actuated
by
the throttle
control
when
t~he
gear
control
switch
handle
is
UP and
the throttle
is
less
than
1/4
inch from idle
position.
NOSE WHEEL LOCATION FIGURE
32-22
Check
warning
horn
for
volume
in
Right periodically.
Hom
will
sound
if
gear
is
not
DOWN and
LOCKED
even
if switch is in
DOWN
position
or
if
airspeed
is
6.
Run
gear
through
retraction/extension
cycle.
below
65
KIAS and
gear
switch
is in
UP
position.
Check
nose
gear
door and
wheel well tire clearances.
Re-rig
if
required.
32-60-03
AIRSPEED SAFETY
SWITCH
ADJUSTMENT
32-60-00
POSITION
AND WARNING
The
airspeed
safety
switch,
located
inside the
cabin,
is
mounted
on
the
left side of the
cockpit,
forward
of
the
32-60-01
ELECTRIC GEAR SAFEN
DEVICES
pilots
left knee. The
airspeed
safety
switch
is
incorporated
into
the
electrical
system
to
prevent
The
gear
switch
operates
the
landing
gear
actuator
landing
gear
retraction
while
on
th2~
ground
and
at
relay. Pulling
the
wheel-shaped
knob
out
and
moving
it
airspeeds
below
60
+/-5
)CTS.
Additionally
the
RED
to
the
upper
detent raises the
gear.
However,
an
gear
unsafe
light
comes
on
and
the
warning
horn is
airspeed safety
switch
is
incorporated
into the
electrical
sounded when
the
gear
control handle is
placed
in
the
system
to
prevent
landing
gear
retraction
while
on
the
gear
UP
position
below
60
+/-5
KTS.
ground.
To allow
gear
retraction
with the
aircraft
on
The V.E.P.
manufactured switches
are
field
adjustable.
jacks;
attach
a
IrZ-inch
length
of
3/8
inch
pliable
rubber
They
should close
at
2.8
+1-.4
inches
water.
Adjust
hose
(surgical
tubing)
over
the
pitot
head,
and
pinch
slotted
screw
head
on
center
of
switch
to
obtain
correct
the
open
end
with
a
large
cotter
pin;
roll the
tubing
with
settings.
the
cotter
pin
until the
compressed
air within
the
twisted
tube
actuates
the
airspeed
pressure
switch.
CAUTION
Maintain
pressure
on
the switch
until retraction
is
The
airspeed
safety
switch
is
designed
to
complete.
To
adjust
the
airspeed
switch
refer
to
operate
within
a
specified
range
during
paragraph
32-60-03.
increasing airspeed only.
Due
to
hysteresis
of
The
up-limit
switch will
stop
the
gear
in its
retracted
the
switch/diaphragm
assembly
the
switch
MAY
position.
Moving
the
control
knob
to
its
lower
detent
NOT
deactivate
the
landing
gear
circuitry
until
lowers
the
gear.
The
down
limit switch will
stop
the
approximately
49.5
KTS.
This
could allow
the
gear
actuating
motor
when the
proper
force
is
exerted
landing
gear
to
retract
if the
gear
switch
is
to
hold the
gears
in
the
down-and-locked
position,
inadvertently placed
in the
UP
position
during
Refer
to
SECtlON
32-30-02,7.
for
proper
limit switch
the
landing
roll.
rigging.
The
gear
down-and-locked
position
is
indicated
CAUTION
by:
During
static
system
checks,
pressure
1.
Illumination
of the
green gear
down annunciator
compensation
on
the
pitot
side of the
switch
light.
The
GEAR
DOWN
annunciator
light
is dimmed
diaphram
must
be
considered
or
switch
when
ever
the
Navigation
Light
Switch
is
ON.
diaphram
may
rupture.
NOTE
2.
The
warning
horn
will
not
sound
with
the throttle
Refer
to
proper
electrical
schematic
when
retarded
within
1/4
inch of idle
position,
replacing
with switches
from
another
manufacturer.
3.
The indicator marks
will be
aligned
on
the
visual
gear-position
indicator.
4-99
32-60-00
23
OLDWILLWAYNE