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PROPELLER DEICE SYSTEM
The propeller deice system consists of electrically
heated boots on the propeller blades.
Each boot consists of
two heating elements "Outboard" and "Inboard," which receive
their electrical power through a deice timer.
To reduce
power drain and maintain propeller balance, the timer directs
current to the propeller boots in cycles between boot ele-
ments and between propellers.
NORMAL PROCEDURES
To operate the propeller deice system proceed as follows:
(1)
Battery Switch - ON
(2)
Propeller Deice Switch Breaker - ON (up position).
(3)
Ammeter -
CHECK.
NOTE
e
Periodic fluctuation within the green arc of
the propeller deice ammeter pointer indi-
cates normal operation of the deicing ele-
ments of first one propeller and then the
other.
e
To check all the heating elements of both
propellers and the deice timer for normal
operation, the system must be left ON for
approximately two and one-half minutes.
The timer directs current to the propeller boots in
cycles between boot elements and between propellers in the
following cycling sequence:
Heating Period No.
1
Outboard halves - right engine
blades.
Heating Period No.
2
Inboard halves - right engine
blades.
Heating Period No.
3
Outboard halves - left engine
blades.
Heating Period No.
4
-
Inboard halves - left engine
blades.
7-10
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