Mooney M20K - General; D.C. Generation

SERVICE
AND
MAINTENANCE
MANUAL
M20K
MOONN
AIRCRAFT
CORPORATION
24-00-00
-GENERAL
NOTE
It is
recommended
that
the
approved
Auxiliary
S/N
25-0001
thru
251)999
Power
Cable be
connected
to
the
booster
A
14
volt,
70 AMP
altemator
utilizing
a
trans~torized
battery
and the
plug
inserted
into
the
auxiliary
voltage
regulator/overvo~tage
control
supplies
electrical
power
receptacle,
if
equipped.
power.
An
optional
12
volt,
10
amp.
standby generator
may
be
installed.
A
minimum
of
pilot
effort
is
required
to
C.
When
the
battery
is
removed
from
the
aircraft
properly
use
this
backup
source
of
eledn’city.
A
12
voft,
for
charging,
be
sure
that the
charger
is
correctly
35
ampere-hour
storage
battery
is
installed
in the
connected.
Use
the
correct
charging
rate
when
tailcone.
The
aitemator,
dun’ng
normal
operation,
supplies
charging
battery,
refer to
Manufacturers
procedures.
It
power
in
conjunction
with
the
battery
when
the
master
is
possible
to
reverse
the
polarity
of
a
battery
by
switch
is
on.
The
circuit
breaker
panel
is
on
the
right
connecting
a
charger
backwards.
subpanel.
The
eledn’cal
system
is
capable
of
supplying
D.
Be
sure
to
check
battery
polarity
by
using
a
current
for
simultaneous
operation
of
multiple
radios,
an
voltmeter
priorto
reinstallation
in
the
aircraft.
anticollision
beacon,
and
navigation
lights.
A
shunt
type
ammeter
mounts
in
the
power
plant
instrument
cluster.
E.
Do
not
leave
the
master
switch
ON
when
the
aircraft
is
parked.
S~
25-1000
thru
25-TEA
F.
Use
an
auxiliary
ground
power
unit
when
trouble
A 28
volt,
70
AMP
altemator
utilizing
a
transistorized
shooting
electn’cal
accessory
equipment
or
when
voltage
regulator/over
voltage
control
suupplies
performing
electrical
landing
gear
maintenance
and
electrical
power.
An
optional
28
vo~t,
70
AMP
second
retraction
system
testing.
alternator
may
be
installed.
A
24
volt,
22
AMP
HR
storage
battery
is
installed
in
the
tailcone.
The
2.
ALTERNATOR
SYSTEM
INSPECTION.
alternator,
during
normal
operation,
supplies
power
In
A.
Check
altemator(s)
circuit
breaker(s)
on
the
conjuction
with
the
battery
when
the
master
switch
and
main
circuit
breaker
panel.
Reset
breaker
if
open.
alternator
field
switch
are
ON.
The
circuit
breaker
panel
Is
on
the
right
subpanel.
The
electrical
system
is
B.
Check
applicable
altemator
field
circuit
breaker
capable
of
supplying
current
for
simuRaneous
on
main
circuit
breaker
panel.
Reset
if
open.
operation
of
multiple
radios,
anticollision
lights
and
C.
Inspect
battery
for
corroded
cable
connections;
navigation
lights.
On
S/N 25-1
000
thru
25-1224
a
shunt
remove
and
clean
cable
if
corrosion
is
found.
~Y,PB"
combination
gauge
gives
alternator
output
and
D.
Check
charging
system
wiring
connectors
to
be
load
in
of
rated
capacity
plus
sure
they
are
clean
and
tight.
S/N
25-1225
thru
25-TEA
a
shunt
type
ammeter
is
mounted
in
the
power
plant
instrument
cluster.
E.
Inspect
altemator(s),
voltage
regulator,
and
win’ng
for
damage.
2430-00
-D.C.
GENERATION
CAUTION
2431-01
ALTERNATOR
CHARGING
SYSTEM
DO
NOT
ATTEMPT
TO
POLARIZE
MAINTENANCE
ALTERNATORS.
Alternators are
polarized
1.
ALTERNATOR
SYSTEM
SERVICING.
every
time
Master
Switch
is
turned
ON.
(25-0001
thru
25-0999,
25-1
225
thru
25-TEA)
3.
ALTERNATOR(S)
REMOVAL
3
INSTALLATION
When
the
ammeter
shows
a
discharge
at
higher
A.
Altemator(s)
Removal.
engine
speeds,
a
charging
system
component
(altemator,
voltage
regulator,
circuit
breaker,
or
wiring)
Tum
Master
Switch
OFF.
Disconnect
affected
is
malfunctioning.
altemator
witing.
(25-1000
thru
25-1224)
Selt
Dn’ven
Altemator
Wnen
the
loadmeter
shows
a
higher
than
the
(1)
Loosen
and
remove
adjustment
bolt
from
altemator
output
at
higher
RPM,
a
charging
system
tension
adjustment
bracket.
component
is
malfunctioning.
On-the-plane
testing
(2)
Remove
drive belt
from
altemator
pulley.
should
indicate
which
component
is
faulty
and
needs
to
be
removed
from
the
aircraft
for
bench
testing
and
(3)
Remove
cooling
air duct
from
altemator.
repair
or
replacement.
(4)
Remove
lower
pivot
point
hardware
and
The
altemator
charging
system
requires
no
special
’emove
altemator
from
mounting
bracket.
attention;
however,
improper
maintenance
procedures
Main,
Gear
Driven,
LowerAUtemator
can
damage
the
aRemator
and
wiring.
There
are
several
precautions
that must
be
observed
when
any
components
to
gain
access
to
servicing
the altemator
system:
A.
Be
sure
the master
switch
is off
when
repain’ng
(2)
Remove
mounting
bolts.
the
aitemator
or
voltage
regulator.
NOTE
B.
When
auxiiiary
power
or
a
booster
battery
is
The
main
alternator
is
very
difhcult
to remove.
used,
be
sure
the
cables are
connected
The
lower
enginelfirewall
mount
bolts
may
correctly--positive
to
positive
and
negative
to
require
loosening,
the
upper
bolts
may
require
negative.
DO
NOT
by-pass
the
battery
when
using
removal
and
the
engine
pivoted
around
the
Auxiliary
Power
Source.
lower
attach
points.
24-00-00
OLDWILLWAYNE