Mooney M20K - Warning Circuits; Power Plant Circuits

SERVICE
AND
MAINTENANCE
MANUAL
M20K
MOONEY
AIRCRAFT
CORPORATION
"Hi"
or
Overvolt
Adjustment
at
Regulator-
F.
Clean
battery
terminals
with
emery
cloth,
BENCH
ADJUSTMENT
(ELECTRO
DELTA).
reinstail
and
tighten
cables.
Coat
terminals
and
connectors
with
petroleum
jelly
to
retard
corrosion.
Connect
a
variable
voltage
power
supply
to
the
regulator,
positive
to
pin
"A"
or
"1"
and
negative
to
2633-00
-MIARNING
CIRCUITS
pin
"C"
or
"3"(25-0001
thru
25-0999),
positive
to
pin
5
1.
Landing
gear
position
lights
and
waming
hem.
negative
to
pin
9
for
25-1000
8
ON).
Conned
a
Red
and
green
landing
gear
position
lights
are
in
the
voltmeter
to
the
regulator
to
pin
"D"
or
"4"
and
to
annunciator
panel.
The
gear-down
limit
switch
controls
pin
"C"
or’3"
(25-0001
thru
25-0999),
(pin
6
and
pin
9
the
green
gear-down
light.
Both
limit
switches
control
for
25-1000
ON).
Adjust
voltage
to
16
volts
+I-
.1
volt
the
red
gear
unsafe
light.
The
throttle
control
operates
(25-0001
thru
25-0999),(28.7
volts
for
S/N
25-1000
8
ON).
Adjust
tn’m
pot
(accessable
through
hole in
case
landing
gear
warning
hom
(intermittent
tone)
when
the
marked
"OV~
to
relay tn’p
pointas
indicated
by
voltage
power
setting
is
reduced
below
12
IN.
Hg.
SIN
25-0001
thru
250780
with
the
gear
up;
and
on
25-0781
thru
indication
on
test
voltmeter.
Decrease
voltage
until
25-TEA
when
the
throttle
is
retarded
below
16"
to
18"
relay
closes
and
note
voltage.
Readjust
as
necessary
Hg~
and the
landing
gear
is
still
in
the
up
position.
until
a
tn’p
point
of 16
+I-
.1
volts
is
attained(25-0001
Check
gear
warning
system
during
flight
for
proper
thru
25-0999);
31.8
~1-).3
volts for
25-1000
a
ON).
,peration.
Regulator
Adjustment
(ELECTRO
DELTA)
2.
Prestall
Warning
Circuit.
The
prestall
warning
horn
Conned
an
accu~ate
voltmeter
to
the
aircraft
bus.
Tum
has
a
h~h
frequency
continuous
tone
that
sounds
off
all
eledn’cal
equipment
and
start
engine.
Run
engine
when
airspeed
drops
to
5
to
10
MPH
IAS
(4.3
to
8.7
at
moderate
RPM
(1500-1800)
until
ammeter
drops
to
KIAS)
above
stalling
Speed.
A
vane
in
the
left
wing
low
charge
rate.
Increase
RPM
to
2000
and
adjust
tn’m
leading
edge
aduates
the
prestall
warning
horn
switch.
pot
(accessable
through
hole
in
case
marked
"REG3
for
C~his
vane
is
made
of
heat
treated
steel,
and
any
a
voltage
reading
of
between
13.75
and
14.0
volts
attempt
to
adjust
switch
operation by
bending
the
vane
(25-0001
thru
250999);(28.6
and
28.8
volts
for
251000
will
damage
the
switch).
Refer
to
Section
27-93-00
for
thrr
25-TEA).
Increase
throttle
to
full
RPM
and observe
adjustment
procedures.
that
voltage
does
not
exceed
14
volts
(25-0001
thru
3.
High
and Low
Vacuum
Waming
Circuit.
A
switch
25-0999);(30
volts
for
25-1000
thru
25-TEA).
in
the
vacuum
system
controls
the
vacuum´•
waming
NOTE
light
on
the
annunciator
panel.
Vacuum
below
4.25
IN.
Use
bushings
provided
with
replacement
Hg.
causes
the
vacuum
warning
light
to
flash.
Vacuum
VR-415F
voltage
regulator
to
mount
in
location
above
5.5
IN.
Hg.
hips
the
high-vacuum
switch
causing
of
old
regulators,
the
vacuum
waming
light
to
illuminate
steadily.
NOTE
4.
Low
Fuel
Waming
Circuit. The
low
fuel
indicators
No
field
adjustment
authorized
for
Mooney
will
illuminate
when
a
m’nimum
of
2
112
gallons
usable
Voltage
Regulator.
fuel
remains
in either
left
or
right
hand
tank.
When
it
Max.
Voltage
for
14
Volt
system:
14.2
+~2/-0.
becomes
necessary
to
replace
the
annunciator
panel
for
Max.
voltage
for
28
volt
sytem:
28.3
+.2/-0
any
reason
other
than
"low
fuel"
waming
maifundion,
the
following
procedure
should
be
used
to
set
the
"low
fuel"
24-32-00
BATTERY
MAINTENANCE
waming
circuits.
The
calibration
t~ansfer
standard
(I.A.I.
PM
500D0045
for
SM
250001
thru
25-1224)
or
IA.I.
CAUTION
PM
9500324000
for
SM
25-1225
thru
25TBA)
B
Battery
gases
are
explosive,
required
for
this
procedure.
Adapters
can
be
ordered
through
Mooney
Marketing
or
Service
Centers.
I.
Battery
Removal.
A.
Calibration
Procedures
using
IA.I.
A.
Tum Master
Switch
OFF.
PM
500D0045
or
P/N
9500324000.
B.
Remove
tailcone
access
cover
and
battery
box
lid.
(1)
Remove
glareshield,
disconnect
plug
from
C.
Disconned
battery
cables,
negative
lead
first,
rear
of
annunciator,
remove
annunciator
front
panel,
remove
battery
from
aircraft.
and
place
"Norm-Cal"
switch
in
"Cal"
position.
D.
Install
battery
in
reverse
sequence
of
removal.
Use
(2)
Plug
model
TS201I231-001
(P/N
500D0045)
a
voltmeter
to
ched~
battery
polaritybefore
installation.
calibration
transfer
standard
on
rear
ofokf
annunciator
2.
Battery
Cleaning
and
Corrosion
Removal.
and reconnect
hamess
plug.
k
Mbe
one
pound
of
baking
soda
h
one
gallon
of
water.
(3)
Tum
on
master
switch
and
tum
right
hand
variable
resistor on
transfer
standard
slowly
counter
B.
Wash
battery
box
and
flush
battery
with
the
mb(ture.
clockwise
until
right
"low
fuel"
light
just
tums
on.
(If
Do not
allow
soda
water
to enter
battery
cells;
permanent
necessary
turn
van’able
resistor
clockwise
to
e~dinguish
damage
will
result
if soda
mixes
with
eledrolyte.
"low
fuel"
light).
@o
not
adjust
annunciator
calibration
C.
Rinse
thoroughly
with
clearwater
and
dry
the
area,
screws). Repeat
for
left "low
fuel".
D. Test
each
cell
with
a
temperature
corrected
(4)
Turn
off
master
switch
and
remove
old
hydrometer.
Specific
gravity
should
be
1265
to
1280
annunciator
assembly
after
disconnection
of
harness
for
a
fully
charged
battery,
and transfer
standard
unit.
E.
Check
electrolyte
level
and
maintain
at
split
ring.
24-32-00
OLDWILLWAYNE