Maintenance Practices; Alternators - Raytheon BEECH BARON 58P Maintenance Manual

BEECHCRAFT
BARON 58P AND BARON 58TC
MAINTENANCE MANUAL
DC GENERATION
MAINTENANCE PRACTICES
CAUTION
ALTERNATORS
Care
must
be taken when removing the
alternator
to prevent damage
to
the gear
splines
The airplane electrical
system
includes two
50 ampere, 24
on
the alternator.
volt, gear-driven alternators
as
standard equipment (two 100
ampere, 28
volt, gear-driven alternators
are
optional). The
alternators
are
controlled
by two
fully transistorized electronic
ALTERNATOR INSTALLATION
voltage regulators. The alternator
systems
are
separate,
except for
a
mutual tie to the main battery bus and
a
single
paralleling wire which
connects
the
two
voltage regulators CAUTION
together.
Before installing
the
alternator,
make
sure
the
Individual alternator
output
is indicated by
two
loadmeters
nut
on
the drive shaft of the alternator is
located
in the center section of the
instrument panel. Each
tightened
to
a
torque
of 400 inch-pounds. If the
loadmeter provides
an
indication of the
output
of the
castellations of the
nut
do
not
match the shaft
alternator
as a
percentage of the rated capacity of the
tighten
to
the
next castellation (do not torque
alternator.
more
than 500 inch-pounds). Do
not
back the
nut
off, always tighten the
nut.
Safety the
nut
with the
The circuit of each alternator contains
an
overvoltage
sensor cotter pin
through
the castellation.
to protect
the airplane
systems
from excessive voltages. Two
warning lights placarded
ALTERNATOP,-L-R located
on
the
left side of the instrument panel, will illuminate OUT
NOTE
I
whenever the respective alternator
voltage drops
1.5 to 3.0
volts below bus voltage.
The
cotter
pin
must
be installed and then
trimmed. The
portion
bent toward the alternator
ALTERNATOR REMOVAL
housing
must
NOT touch the thrust washer
when
bent
over
the
nut.
The
portion
bent away from
a.
Open
the
engine compartment
door
on
the
the alternator housing
must
NOT reach beyond
alternator side.
the threads
on
the
end of the shaft.
b. Remove the upper engine cowling.
c.
Disconnect the electrical wiring from the altemator.
Tag wiring
to
facilitate reinstallation.
a.
Position the alternator
gasket and alternator
on
the
engine pad. It may be necessary
to turn the prop slightly,
or
remove
the alternator and rotate the
gear
spline
on
the end of
CAUTION
the alternator shaft
in order to align the drive gear in the
engine with the gear
on
the alternator.
Make
sure
the
battery
master
switch is in the off
position before removing the wires
at
the
alternator. The
output
terminal of the alternator is
WARNING
connected directly to the
battery through
the
battery
master
relay. To prevent accidental
When working
on a
propeller, always make
damage to the wiring
harness and the alternator,
certain that the ignition switch is in the OFF
the battery ground
cable and all external
ground
position and the
engine has cooled completely.
power should be disconnected.
To be safe, treat all
magnetos
as
hot. To
ground
the magneto, disconnect the
magneto
sm'tch
wire at the
capacitor and ground the capacitor
d. Remove
lockwashers, washers and nuts
securing
pole. If this is impractical,
remove
the ignition
the alternator
to
the engine,
harness distributor cap,
or
disconnect the spark
e.
Carefully
remove
the alternator from the engine
plug
leads. When
moving
a
propeller, stand in
pad.
the clear.
24-30-00
Page
201
Nov
30/78