Tj-349) - Raytheon BEECH BARON 58P Maintenance Manual

BEECHCRAFT
BARON 58P AND BARON 58TC
MAINTENANCE MANUAL
PROPELLERS
TROUBLESHOOTING
is
open
between the
slip ring and deicer
(PRIOR
TO TK-139 AND TJ-349)
heater. If the
ammeter registers
excess
current,
the
power
lead
is shorted
to
ground. It
may
be possible that the
excess
The
ammeter
of the deicer
system
can
be
current
has welded the
timer
contacts
in
used
to
indicate the
general
nature
of
one
phase. Under these
circumstances, the
most
electrical
problems. Consequently,
timer will either
feed
current to
the
it is recommended that
troubleshooting be welded
contacts
continuously
or
will
not
preceded by the
ammeter test
as
outlined cycle. If
the former
is true,
the
heat
under ELECTRIC PROPELLER DEICER
in Chapter
test
will
show
two
phases heating
simul-
5-20-00 of this
manual, and the HEAT TEST
taneously throughout
three of the four
described
~n
this chapter
to
determine phases.
Unless
the
grounded
power
lead
is
which circuits
are
involved. A
reading
of
located and
corrected,
any new
timer that
two-thirds
the
normal
amount
of
current
is installed
may
suffer the
same
internal
is
an
indication that
one
of the circuits
damage during
the first
use
of the
system.
CHART 101
TROUBLESHOOTING PROP DEICE SYSTEM
(PRIOR TO TK-139
AND TJ-349)
TROUBLE
PROBABLE CAUSE
REMARKS
i. Ammeter shows
zero a.
Circuit
breaker
a.
Locate
and
correct
short
current
(All 4 phases
of tripped,
before
resetting circuit
the
2-minute 16-second
breaker.
cycle.)
b.Switch
faulty.
b.lf
no
voltage
at
switch
out-
put
with
voltage
at
switch
input,
replace
the switch. If
voltage is OK
at
switch
output,
go
to
step
"d"
c.No
power
from air- c.If
no
voltage
into
switch,
plane,
locate and
correct
open
cir-
cult.
d.Ammeter faulty. (If
d.Test
for voltage
up
to
and
some
of all
deicers heat
out
of
ammeter.
If low
or zero
with
ammeter at
zero,
output
but
proper
input,
replace the ammeter.)
replace
ammeter.
If
no
voltage
to
ammeter,
locate and fix
open
between
switch and
ammeter.
e.Open
ci rcui
t
between e.Disconnect
harness
at
timer
ammeter
and timer.
and
check voltage
pin
B (of
harness)
to
ground. If
none,
locate
and
correct
open
cir-
cult.
30-60-00
Page
101
A22
May
22/87