Mooney M20R - CHAPTER 24 General; Alternator Charging System Maintenance; DC Generation; Voltage Regulator Maintenance

SERVICE
AND
MAINTENANCE
MANUAL
M20R
MOONEY
AIRCRAFT
CORPORATION
2400-00
GENERAL
2.
Alternator
System
Inspection.
A.
Check
alternator
circuit breaker
on
the main
A
28
volt,
100
AMP
alternator
utilizing
a
transistorized
voltage
regulatorlover
voltage
control
supplies
electri-
Ci’CUit breaker
panel.
Reset
breaker,
if
open.
cal
power.
Two
24
volt,
10
AMP
HR
storage
batteries
B.
Check alternator
field
circuit
breaker
on
main
are
installed
in
the
tailcone.
The
alternator,
during
nor-
circuit
breaker
panel.
Reset,
if
open.
mal
operation,
supplies
power
in
conjunction
with
the
C.
Inspect
batteries
for
corroded
cable
connec-
selected
battery
when
the
Master
Switch
and
Alternator tions;
remove
and
clean
cable(s)
if
corrosion
is found.
Field
Switch
is
ON.
The
circuit
breaker
panel
is
on
the
D.
Check
charging
system
wiring
and
connectors
right
subpanel.
The
electrical
system
is
capable
of
sup-
to
be
sure
they
are
clean
and
tight.
plying
current
for
simultaneous
operation
of
multiple
E.
Inspect
alternator,
voltage
regulator,
and
wiring
radios,
anti-collision
lights
and
navigation
lights,
for
damage.
A
shunt
type
ammeter
(with
PUSH
for
VOLTS)
is
lo-
CAUTION
cated
on
instrument
panel.
DO
NOT
ATTEMPT
TO POLARIZE
ALTERNATOR.
Al-
24-30-00
D.C.
GENERATION
ternator
is
polarized
every
time
Master
Switch
is
turned
ON.
24-31-01
ALTERNATOR
CHARGING
SYSTEM
3.
Alternator
Removal
and Installation.
MAINTENANCE
A.
Alternator
Removal.
1.
Alternator
Systems
Servicing.
(1)
Turn Master
Switch OFF.
Disconnect alter-
When
the
ammeter
shows
a
discharge
at
higher
RPM,
nator
wiring.
a´•
charging
system
component
(alternator,
voltage
(2)
Remove
forward,
lower baffle
below alter-
regulator,
circuit
breaker
or
wiring)
is
malfunctioning.
nator.
On-the-plane
testing
should
identify
which
com-
(3)
Remove
attaching
hardware
and
pull
alter-
ponent(s)
may
be
faulty
and
needs
to
be
removed
from
nator
drive
gear
from
engine pad.
the
aircraft
for
bench
test
and
subsequent
repair
or
re-
B.
Alternates
Installation.
placement.
(1)
Be
sure
Master
Switch
is turned
OFF.
Do
The
alternator
charging
system
requires
no
special
at-
not
turn
Master
Switch
ON
until
all
wiring
connections
tention;
however,
improper
maintenance
procedures
have
been
secured.
can
damage
the
alternator
and
wiring.
There
are
(2)
Insert
alternator
into
engine
accessory
drive
several
precautions
that
must
be
observed
when
ser-
pad.
Install
attaching
hardware.
vicing
the alternator
system:
(3)
Connect
alternator
wiring
and
check
wiring
A. Be
sure
the
Master
Switch
is
OFF
when
repair-
connectors
throughout
system.
ing
the
alternator
or
voltage
regulator.
(4)
Reinstall
forward,
lower
baffle
below alter-
B.
When
auxiliary
power
or
a
booster
battery
is
nator.
used,
be
sure
cables
are
connected
correctly-
positive
24-31-02
VOLTAGE
REGULATOR
to
positive
and
negative
to
negative.
DO NOT
by-pass
MAINTENANCE
the
batteries
when
using
Auxiliary
Power
Source.
The
battery
charging
rate
depends
upon
the
battery
NOTE
condition
and
the
voltage
regulator
setting.
With all
It is
recommended
that
the
approved
Auxiliary
equipment
turned
off
and the
engine
running
at
2000
Power
Cable
be
connected
to
the booster
battery
RPM
or
faster,
the
normal
battery
charging
rate
will
be
and
the
plug
inserted
into
the
auxiliary
power
5
to
35
amperes.
receptacle.
1.
Excessively
High
Charging
Rate.
Check
the fol-
C.
When
either
battery
is
removed
from
the
lowing:
aircraft
for
charaing.
be
surP
that
the
charger
is
cor-
A.
Fly
aircraft
for
15
to
20
minutes;
charging
rate
rectly
connected.
Use
the
correct
charging
rate
when
snoulcl
Sluwl~
drur
L3
ri,
amperes
or
less.
A
very
low
charging
battery,
refer
to
manuia@eurer’s
pvoced~;as.
it
J
./:iger
to
s~o\N
a
drop
in
charging
cur-
is
possible
to
reverse
the
polarity
of
~r;
battery
by
con-
rerit.
necting
a
charger
backwards.
B.
I\i~aasll--e
~s’"-)ge
with
a
voltmeter
connected to
the
bus.
At
800
F.,
voltage
should be
27.5
to
31.8
volts.
CAUTION
An
excessively high
voltage
regulator
setting
will
cause
Both
batteries
MUST
BE
in
aircraft
for
flight.
excessive
battery
heating
and
water
loss.
D. Be
sure
to
check
battery
polarity
by
using
a
2.
Low
Charging
Rate.
Check
battery
charging
rate
voltmeter
prior
to
reinstallation
into
the
aircraft.
(normal
rate
is
not to
exceed
four
amperes).
The
E. Do
not
leave
Master
Switch
"ON"
when
aircraft
regulator
should
not
be
considered
defective because
is
parked.
of
a
low
charging
rate
until:
F.
Use
an
auxiliary
ground
power
unit
when
A.
A voltmeter
check
indicates
that
voltage
at
the
trouble
shooting
electrical
accessory
equipment
or
bus
is below
requirements.
LYhen
performing
electrical
landing
gear
maintenance
B. A
battery
hydrometer
check
indicates that
bat-
and
retraction
system
testing,
r
tery
is
not
fully
charged.
ORIGINAL
24-00-00
As
Received
By
ATP
Island Enterprises