Beechcraft Baron 58 - Ice Protection Systems

Section VII
Systems
Description
ICE PROTECTION SYSTEMS
SURFACE DEICE SYSTEM
BEECHCRAFT Baron 58
Serial TH 773 and After
Deice boots bonded to the leading edges of the wings and
the tail surfaces are operated by
engine-driven pump pres-
sure. Compressed air,
after passing through the pressure
regulator, goes to the distributor valve. When the deice sys-
tem is not in operation,
the distributor vaIve appl ies vacu um
to the boots to deflate and hold the boots
flat against the
surface. Then, when the deice system is operated, the dis-
tributor valve changes from vacuum to pressure and the
boots inflate. After the cycle is completed, the valve returns
to vacuum hold down.
A three-position, spring loaded switch, with a center OFF
position, a
MAN (manual) down position, and an up AUTO
(automatic) position,
controls the system. When the switch
is in the AUTO position, the deice boots inflate for a period of
five to six seconds,
then deflate automatically and return to
the vacuum hold
down position. The switch must be tripped
for each complete cycle. In the
MAN position the deice boots
inflate as long as the switch is held in this position. When
the switch is released, the boots deflate and go to the
vacuum hold down condition.
Deice boots are designed to remove ice
after it has accumu-
lated, rather than prevent its formation. If the rate of ice
accumulation is slow, best results are obtained by leaving
the deice system off
until 1/2 to 1 inch of ice accumulates.
Bridging can occur if boots are actuated too early or too
frequently.
7-40
October 1 976