Special Inspections - Raytheon BEECH BARON 58P Maintenance Manual

Ray~heon Aircraft
BEECH BARON 58P AND BARON 58TC MAINTENANCE MANUAL
SPECIAL
INSPECTIONS
PROPELLER DEICER SYSTEM INSPECTION
The various components
of the
propeller deicer
system
should be inspected
every 50 hours for the appearance of
defects. The
following inspection
may
provide
a means
of detecting and correcting
such defects before
they
render
the deicer
system
inoperative.
ELECTRIC PROPELLER DNCER (50-HOUR GUIDE)
a.
Lock the brakes and operate the
engines
at
near
takeoff power. Turn the deicer
system
switch ON and observe
the ammeter
for
at
least 2
minutes. If the
ammeter
needle does not rest
within the shaded band (except for
a
flicker
that may
occur
when the
step
switch of the timer cycles) refer
to
the
troubleshooting chart in Chapter 30-60-00 for
the
probable
sources
of trouble.
NOTE
Timers with electronic stepping
circuits may
not
"flick" noticeably
between cycles.
I
wnaalFlo
I
WARNING
Before moving the propeller,
make certain that the
ignition switch is OFF and that the
engine
has cooled completely.
There is
always
some
danger of
a
cylinder firing when
a
propeller is
moved.
PCAUTION1
CAUTION
When following
the instructions of step "b",
move
the propeller
back and forth
to prevent
arcing be-
tween
the brushes and the
slip ring.
b. With the engine
shut down,
turn
the deicer switch ON and feel the deicer boots
on
the propeller
for the proper
sequence of the heating
elements. The presence of local hot spots
indicates damage
to
the heating
elements, which
should be
repaired before
more
serious
damage develops.
c.
Remove the spinner
dome and open ail
access
doors pertaining to the
wiring and
components
of the deicer
system.
Turn the deicer switch ON and station
an
assistant in the pilot's
compartment
to
observe the
system
am-
meter.
Flex all accessible
wiring, particularly
the lead
straps,
leads from the slip ring assembly,
and the firewail elec-
trical connectors
and their wiring. Any movement
of the
ammeter,
other than the cycling
flicker that may
occur
when
the
step
switch of the timer
cycles,
indicates
a
short
or
open circuit that must be
located and corrected.
d.
To extend
the life of the lead
strap
between the hub clamp
and clip, reposition
the bend
at
least 1/2 inch from
the existing
location of the bend.
e.
Check for
damaged springs,
and
worn or
damaged brushes.
ELECTRIC PROPELLER DNCER
(100-HOUR GUIDE)
a.
Check for radio noise
or
compass interference by operating the engines at
near
takeoff power with the radio
gear turned ON. If,
under these conditions,
noise
or
interference
occurs
when the deicer
systems
switch is turned
ON and disappears
when the switch is OFF,
refer
to
the troubleshooting
chart for the probable
source
of trouble.
Jun
2 8 / 0 2 P a g e 216
5-20-00