Left Overvoltage Sensor; Right Overvoltage Sensor - Raytheon BEECH BARON 58P Maintenance Manual

BEECHCRAFT
BARON 58P AND BARON 58TC
MAINTENANCE MANUAL
alternator field circuit and thus
the
alternator
voltage is
i. Reduce the variable voltage
power
supply
to
28.25
removed from the airplane bus. A warning light, located
on
vdc. The L ALTERNATOR OUT
warning light should remain
the left hand instrument
panel,
will illuminate OUT,
when the
illuminated.
respective alternator is disconnected from the bus,
j. Tum off the LT ALT switch. The LALTERNATOR
OUT
warning
light
should go
out.
No
attempt
should be made
to
adjust the
overvoltage
k. Turn
on
the LT ALT switch. The
LALTERNATOR
sensors.
They
are
preset
at
the
factory to trip
at
a
voltage of
OUT warning light should remain
out.
32.00
.25 vdc. When the
sensor
is determined
to
be
i.
Turn OFF the
variable
power
supply,
the LT ALT
inoperative, it should be replaced.
switch and the battery
master
switch. Remove all
test
equipment
and reinstall the P59816 lead wire.
OVERVOLTAGE
SENSOR
CHECK'(Figure
202)
RIGHT OVERVOLTAGE SENSOR
The
overvoltage
sensor
should be checked
at each 100 hour a.
Remove right engine nacelle
access
door
on
top
of
inspection
or
whenever the voltage regulators,
alternators,
the nacelle.
overvoltage
sensors or
overvoltage relays have been
b. Disconnect the
lead wire
P59B16
at
the diode
on
I
replaced. The
following procedures may be used
to test
the
the heat sink.
overvoltage
sensors,
c.
Using a~ variable power supply capable
of
supplying 0-50 vdc connect the
positive
lead of the power
supply
to
the lead wire P59B16. Conned the
negative lead of
the
power
supply to
airframe
structure.
LEFT
OVERVOLTAGE SENSOR
d.
Using
proper
procedures,
connect
a
precision
voltmeter
1% accuracy)
across
the terminals of the power
a.
Remove left engine
nacelle
access
door
on
top
of
supply.
the nacelle.
e.
Turn
on
the battery
master
switch.
b. Disconnect
the
lead wire P59B16
at
the diode heat
f. Press the PRESS TO TEST switch
on
the WARN
sink.
LIGHT SYSTEM
to
check the ALTERNATOR-L-R OUT
c.
Using
a
variable power
supply capable of
warning light.
Supplying 0-50 vdc,
connect the positive lead of the power
g.
Turn
on
the RT ALT switch. Monitor the R
supply
to
the lead wire P59B16. Connect the
negative
lead of
ALTERNATOR OUT
light. It should
not
be illuminated.
the power
supply
to
airframe
structure.
h. Set the power supply
at
28.25 vdc and
turn
on.
d. Using
proper
procedures, connect
a
precision Slowly
increase the voltage from 28.25 to 33.00 vdc while
voltmeter
1% accuracy)
across
the terminals of the power
monitoring the precision voltmeter and the R ALTERNATOR
supply.
OUT
warning light. The warning light should illuminate
at
e.
Turn
on
the battery
master
switch.
32.00
.25 vdc.
f. Press the PRESS TO TEST
switch
on
the WARN
i. Reduce
the
vailable
voltage
power
supply
to
28.25
LIGHT SYSTEM
to
check the ALTERNATOR-L-R OUT
vdc. The R ALTERNATOR OUT
warning light should remain
warning light.
illuminated.
g.
Turn
on
the LT ALT switch. Monitor the L
j. Turn off the RT ALT switch. The R ALTERNATOR
ALTERNATOR OUT light. It should not be
illuminated. OUT
warning
light
should go
out.
h. Set the variable
power
supply
at
28.25 vdc and
k. Turn
on
the RT ALT switch. The R ALTERNATOR
turn
on.
Slowly
increase the voltage from 28.25
to 33.00 vdc
OUT warning light should
remain out.
while
monitoring the precision voltmeter and the
L
i. Turn off the
variable voltage
power
supply, the RT
ALTERNATOR OUT warning light.
The warning light should
ALT switch and the
battery
master
switch. Remove all
test
illuminate
at
32.00
.25 vdc.
equipment and reinstall the P59B16 lead wire.
24-31-00
Page
204
Nov 30/78