Mooney M20K - Power Plant Circuits; Low Battery Starting Procedures

MOONEY
AIRCRAFT
CORPORATION
M20K
SERVICE
AND
MAINTENANCE
MANUAL
(5)
Install
new
annunciator
and
connect
ignition
system
is
on.
Turning
the
ignition
switch
to start
calibration
transfer
standard
to
annunciator
panel
and
and
pushing
in,
closes
the
starter
solenoid,
engages
harness
plug.
Remove
front
plate
and
legend
on
new
the starter
and
allows
the
impulse
coupling
to
annunciator
panel
to
expose
the
Norm-Gal
switch and
automatically
retard
the
magneto
until
the
engine
is
the
Leg
and
Right
tn’m
potienometers.
(Switch
must
be
also
at
its
retard
fin’ng
position.
The
spn’ng
action of
the
in
"Cal"
position).
impulse
coupling
is then
released
to
spin
the
rotating
(6) Adjust
left
and
dght
annunciator
fuel
magnet
and
produce
the
spark
to
fire
the
engine.
After
calibration
screws
clockwise
(not
the
adapter
van’able
the
engine
starts,
the
impulse
coupling
flyweights
do
resistors)
until
"low
fuel"
lights
just
turn
on.
(If
not
engage
due
to
centrifugal
action.
The
coupling
then
necessary
tum
annunciator
calibration
screw
counter
acts
as a
straight
dn’ve
and
the
magneto
fires
at
the
normal
fin’ng
position
of the
engine.
The
starter-ignition
clockwise
to
e~dinguish
"low
fuel"
light),
switch
is
spn~ng
loaded
to retum
from
START
to
the
O
Remove
calibration
transfer
standard,
BOTH
position
when
released.
reconnect
plug
to
annunciator
panel,
set
switch
to
"Normal"
position,
install
annunciator
front
panel
and
CAUTION
install
glareshield.
Do
not
operate
the
starter
in
excess
of
15
B.
Altemate
method
for
calibration without
unit.
seconds
or
re-engage
the
starter
without
allowing
it
time
to
cool.
If
calibration
transfer
standard,
P/N
500D0045,
is
not
available
use
the
following
method
to
calibrate
"low A.
Low
Battery
Starting
Procedures.
fuel"
wamlng:
Batten’es that
have
been
discharged
to
the
point
where
glareshiald
and
remove
annunciator
they
will
not
tum
the
engine
but
have
sufficient
power
remaining
for other
equipment;
should
NOT
be
jumped
with
another
power
source
fortwo
major
reasons:
(2)
Install
and connect
new
annunciator
assembly
aircraft
battery
is
not
leaving
off front
panel.
(Set
switch
to
"ca1’3.
(1)
The
discharged
airworthy
because
it
will
not
have
the
necessary
(3)
Drain
fuel
from tanks
and
replace
with
resenre
capacity
required
to
operate
the
aircraft
unusable fuel
plus
2
1/2
gallons
in both
tanks.
electn’cal
system
and
avionics
in the
event
of
the
failure
(4)
Tum Master
Switch
ON;
adjust
calibration
of the
generating
system
dun’ng
flight.
pots
to
position
where
"low fuel"
lamps
just
tum
on
for
(2)
Adive
material on
the
positive
plate
e~cpands
left and
right
tanks.
when
the
battery
is
discharged
and
the fast
recharge
(5)
Turn
Master
Switch
OFF;
set
annunciator
from
the
higher
potential
source,
battery,
aitemator,
"Cal"
Switch
to
"Norm"
position,
install
annunciator
generator,
rectifier,
etc.,
will
severely
damage
the
front
and
install
glareshield.
battery.
A
slow
charge
is
recommended
priorto
flight.
(6)
Refuel
aircraft.
WARNING
5.
Aftemate
Air
Light
Warning
Circuit
Annunciator
Do
not
turn
the
propellerwhen
the
magnetos
Panel.
The
light
illuminates
on
the
annunciator
panel
are
not
grounded.
Ground
the
magneto
points
when
the
altemate
air
door has
opened
for
any
reason.
before
removing
switch
wires
or
electrical
connectors.
All
spark
plug
bads
can
be
6,
Hifl-ow
Voltage
Waming
Circuit
Annunciator
removed
as
an
alternate
safety
measure.
Panel.
Remove
annunciator
top
cover.
Connect
a
voltmeter
to
the
aircraff
bus.
Start
engine
and
Nn
at
2.
Oil
and
Cylinder
Head
Temperature
Gauge
idle.
Add
load
to
bus until
"Low
Volt"
light
starts
to
Circuits.
Both the
oil
and
cylinder
head
temperature
flash.
Adjust
RPM
to
obtain
a
bus
voltage
of 12.5 volts
indicators
operate
eledrically.
The
oil
temperature
(25-0001
thru
25-0999);(26.5
volts for 25-1000
thru
gauge
circuit
has
a
resistance
bulb
in the
oil
sump.
25-TEA).
Adjust
trim
pot
(located
at
center,
rear
of
Changes
in
resistance
caused
by changes
in oil
circuit
board)
till
flashing light just
comes on,
temperature
alter
current
flow
rate,
thereby
varying
the
NOTE
magnetic
field in the
indicator
coils.
The
cylinder
head
temperature
indicator
conneds
to
a
t~p
sensitive
It
may
be
necessary
to
adjust
trim
pot
to
turn
resistance
bulb in
a
cylinder
head,normally
No.
5
out
light
at
42.5 volts
(25-0001
thru
cylinder.
Increase
or
decrease
in
temperature
causes
25-0999);(26.5
volts for
25-1000 thru
25-TEA)
an
increase
or
decrease
in
bulb
resistance,
varying
the
first.
Increase RPM.
until
light
goes
out
and
magnetic
field
in
the
indicator
coils.
note
voltage.
Decrease
RPM until
light
flashes
on
and
note
voltage.
Light
should
come
on
at
a
3.
The
oil
pressure
instrument
circuit
contains
an
voltage
between
12.4
and 12.6
volts
(25-0001
electn’cal
instrument
used
as a
reference,
and
a
thru
259999);(26.4
and
26.6
volts
for
25-1000
transducerwhich
varies
resistance
with
pressure.
thru
25-TEA).
4.
Fuel
Flow
is
indicated
on
either
an
electrical
instrument
using
a
pressure
transducer
which
varies
24-34-00
POWER PLANT
CIRCUITS
resistance
with
pressure
or
with
an
electrical
i.
Starter-ignition
Circuit. The
starter-ignition
switch
instrument
which
counts
electrical
pulses
produced
by
has five
positions:
OFF,
R
(right),
L
(leff),
BOTH,
and
a
turbine
flow
transducer.
START.
In the
OFF
position
both
magnetos
are
grounded.
At
the
R
position
the
left
magneto
grounds.
At
the L
position
the
n’ght
magneto
grounds.
At
the
BOTH
position
both
magnetos
are
HOT
and
the
24-34-00
OLDWILLWAYNE