Mooney M20K - Airspeed Safetyswitchadjustment; Landing Gear Shockdisclnspection; Landing Gearwaming System; Miscellaneous

MOONEY
AIRCRAFT
CORPORATION
M20K
SERVICE AND
MAINTENANCE
MANUAL
1.
Illumination
of
the GREEN
gear
down annunciator V,E,P.
manufactured
switches
are
field
adjustable.
light,
This
"GEAR
DN"
annunciator
light
is dimmed
They
shoukl dose
at
2.8
.4
inches
water.
Adjust
slotted
when
navigation
lights
are
ON.
screw
head
on
center
of
swach
to
obtain
coned
settings.
2.
The
warning
hom
will
not
sound with the throttle
CAUTION
retarded
below
1200
RPM
(10
in.
MP,
SM 25-000~
The
airspeed
safety
switch
is
designed
to
thru
25-0780)
or(16
in. MP.
SM 25-0781 8
ON).
operate
witt~in
a
specified
range
during
3.
The
indicator
marks
will
be
aligned
on
the
visual
increasing
airspeed only.
Due
to
hysteresis
of
gear-position
indicator,
the
switchldiaphram
assembly
the switch
MAY
NOT
deactivate the
landing
gear
circuitry
until
CAUTION
approximately
57
MPH
(49.5
KTS).
This
could
When
running
gear
up
or
do\nn
electrically
DO
allow the
landing
gearto
retract
if
the
gear
NOT
use
circuit breaker
as a
switch, switch is
inadvertently
placed
in the
UP
position
dun’ng
tbe
landing
roll.
Partial
retraction
or
extension
may
be
accomplished
electn’cally
as
follows: WARNING
Do
not
turn
knurled
knob
on
back
of switch
1.
Place Master
Switch
in OFF
position.
housing
(Whitma(-General
Switches) when
2.
Move
gear
switch
to
GEAR UP
or
GEAR
DOWN
disconnecting
switch from
electrical
as
desired,
connections.
This
is
airspeed
adjustment
knob,
3.
Momentan’ly
actuate master
switch until
gear
is in
CAUTION
desired
position.
During
Static
system
checks,
pressure
32-60-02
LANDING
GEAR WARNING
SYSTEM
compensation
on
the Pitot
side of
switch
diaphram
MUST
be
considered
or
switch
The
landing
gearwaming
system
consists of:
diaphram
may
rupture.
1.
Landing
gear
position lights:
(GEAR
DOWN-WHITE
indicator
light
on
floor
and GREEN
light
NOTE
on
annunciator;
GEAR
IN
TRANSIT
up
or
down
Referto
proper
electrical
schematic
when
replacing
RED
unsafe
on
annunciator;
GEAR
UP
NO
LIGHTS.)
with
switches
from
another
manufacturer.
2.
A
warning
hom in
cabin is actuated
y
throttle
control
when
gear
control switch
handle
a
,p
,,d
32-80-00
-MISCELLANEOUS
throttle
is less
than 10
inches
(25-0001
thru
25-0780)
32-81-00
LANDING
GEAR
SHOCK
DISC
or
16
inches
(25-0781
8
ON)
Manifold
Pressure.
INSPECTION
Check
warning
hom for
volume
in
flight pen’odically.
Hom
will
sound if
gear
is
not
DOWN and
LOCKED
1
Aircraft
with
full fuel load
and
we~M
on
landing
gear.
even
if switch
is
in DOWN
position
or
if
airspeed
is
A.
Main
gear
shock
discs.
below
65
KIAS
8
gear
switch
is
in
UP
position.
(1)
Check
gap
between
retaining
collar
(A)
326043
AIRSPEED
SAFETY SWITCH
(Figure
32-21)
and
top
retaining
plate (B).
Allowable
ADJUSTMENT
gap
is
0.00
to
0.60
inches.
The
airspeed
safety
switch,
located inside
cabin,
is
(2)
Replace
discs when
gap
exceeds
tolerance.
mounted
behind
airspeed
indicator.
The
airspeed safety
Use
shockdisc
replacement
tool
(C),
P/N
GSE
switch
is
incorporated
into eledn’cal
system
to
prevent
030011,
told
PM
ME121),
to
remove
and install
main
landing
gear
retraction
while
on
the
ground
and
at
gear
shock discs.
Use
removable
pad
from
tool
as
a
airspeeds
below
75
5
MPH
(65
+7/-4
KTS). Additionally
guide
on
top
of
shock
link
to
align
discs
as
they
are
the
RED
gear
unsafe
light
comes
on
and
warning
hom
being
compressed.
sounds
when
gear
control handle
is
placed
in ’GEAR
UP"
(3)
Careful
application
of
shock
disc
replacment
position
below 75
5
MPH
(65
+7/-4
KTS).
tool is recommended
during
replacement
of
main
gear
NOTE
shock
disc
to
keep
from
damaging
grease
fittings.
Whitman-General switches
can
be
adjusted
NOTE
using
the
following procedures:
Shock disc
retention
collar
should be
installed
with chamfer
facing
down
and
forward.
1,
Using
a
water
manometer
to
measure
pressure,
gradually apply
air
pressure
to
inlet
at
cap.
B. Nose
Gear
Shock Discs.
2. Conned
an
ohmmeter
between microswitch leads.
(1)
Check for
gap
between
retaining
collar
(D),
3.
Gradually
increase
pressure
to
2.775 inches of
(Figure 32-22)
and
top
retaining
plate
(E).
Top
water
until
diaph~am
movement
closes microswitch.
retaining plate
must
be in contact
with
retaining
collar.
4.
Slowly
decrease
pressure
until
microswitch
opens.
(2) Replace
shock
discs
if
gap
is
found.
Use
shockdisc
replacement
tool
O,
P/N
GSE
030010,
told
5.
Adjust
knurled
knob
at
Fear
of switch
housing
until
PM
ME120),
to
remove
and
install
nose
gear
shock
switch closes
at
an
increasing
pressure
of 2.775
discs. Use removable
pad
from
tool
as
a
guide
on
top
.3841-.359
in.
water
C/5
5
MPH
or
65 +7/-4
KTS).
,f
shock
link
to
align
discs
as
they
are
being
6.
Secure set
screw
and
repeat
step
(5)
five times.
compressed.
32-60-02
24
OLDWILLWAYNE