Tires; External Power; Battery - Raytheon BEECH BARON 58P Maintenance Manual

BEECHCRAFT
BARON 58P AND 58TC
MAINTENANCE
MANUAL
SCHEDULED
SERVICING
MAINTENANCE inadequate
sround
power
unit
can
cause
PRACTICES
voltage below the
drop-out voltage of the
starter
relay,
resulting in
relay chatter
TIRES
and
welded
contacts.
By the
same
token,
a
maximum
continuous
load
in
excess
of 350
The main
wheel tires
are
19.5
x
6.75-8,
amperes
will
damage
the external
power
10
ply rated,
tube type.
The
nose
wheel relay and
power
cables of the airplane.
tire
is
a
5
x
5.00, 6 ply, tube
type.
Observe
the following precautions
when
using
an
external
power source:
Inflate
the
nose
wheel
tire to
47-50
psi,
and the main
wheel tires
to
76-82
psi,
if
a.
Use only
an
auxiliary
power
source
necessary
to
comply
with
runway
landing
that is
negatively
g roun
ded If the
restrictions,
main
gear tire pressure may
polarity
of the
power
is unknown,
deter-
be
reduced
to
65
pst.
Maintaining
mine the
polarity with
a
voltmeter before
recommeded tire
inflation
will help
to
connecting
the unit
to
the airplane.
avoid damage
from
landing shock and
con-
tact
with sharp
stones
and
ruts,
and will b.
Before connecting the
external
minimize tread
wear.
When inflating tires,
power
unit, turn
OFF all radio
equipment
inspect
them
visually for cracks, breaks,
and alternator
swi tche
s
but leave the
or
evidence of
internal damage.
battery
master
switch ON
to protect tran-
sistorized
equipment
against transient
NOTE
voltage spikes.
Beech Aircraft
Corporation
cannot
CAUTION
recommend
the
use
of recapped
ti
res.
Recapped ti
res
have
a
When the battery switch is
turned
tendency
to
swell
as a
result of off
for extended ground
power
the
increased temperature
gener-
operation, place
an
external
bat-
ated during
takeoff. Increased
tery
in
parallel with the
output
tire size
can
jeopardize
proper
of the external power unit before
function
of
the
landing
gear
operating
any
transistorized
retract
system,
with
the possi-
avionics
equipment.
bility
of damage to
the
landing
gear doors and
retract
mechanism.
c.
If the
ground power unit does
not
have
a
standard AN plug,
check the polar-
While
Beech Aircraft Corporation ity
of the plug.
The
positive
lead
from
cannot
recommend recaped
tires,
the
ground power unit must connect to
the
tires
retreaded by
an
FAA
approved
center
post,
the
negative
lead
must
con-
repair station
with
a
specialized
nect
to
the front
post
and positive
volt-
serv
i
ce
1 i mi tati
on
rating
for
age
of 24-28 vdc
must
be
applied
to
the
TSO-C62c
may
be used,
small polarizing pin
of the
airplane's
external
power
receptacle.
EXTERNAL POWER
BATTERY
The airplane
electrical
system
is
pro-
tected
against damage from
reverse
polar- Two
25 ampere-hour, 12-volt,
lead-acid
ity
by
a
relay and
diodes
in the
external batteries connected
~n ser~es
are
power circuit.
The external
power recep-
installed in the airplane,
supplying
a
tacle is
located just
inboard of the left total
system
capacity
of 24 volts. Access
engine nacelle.
The external
power recep-
to
the
lead-acid batteries is
obtained by
tacle is
designed
for
a
standard AN
type
removing
the battery box
cover ~n
the
plug. To
supply
power
for ground checks
floor of the forward baggage compartment.
and for ground
power
unit
assist engine
The
battery
box is vented
overboard
to
starts,
a
ground
power
unit
capable
of
dispose
of the electrolyte and
hydrogen
supplying
a
continuous
load of 300
amperes
gas fumes
discharged during normal charg-
at
24-30 volts is
required. Use
of
an
ing operation.
12-20-00
Page
201
A22
May
22/87