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MODEL 182 & T182 SERIES SERVICE MANUAL
with a rubber roller.
assembly for power distribution to the propeller de-
k. Gradually tilting the roller, work the boot care-
icers, a brush block assembly to transfer electrical
fully over either side of the blade contour to avoid
power to the rotating slip ring, a timer to cycle
trapping air in pockets.
electric power to the de-icers in proper sequence,
1.
Rolling outward from the centerline to the edges
an ammeter, mounted in the instrument panel, a
tends to form wrinkles, work them out smoothly and
shunt, a switch and a circuit breaker. The de-ice
carefully with fingers.
system applies heat to the surfaces of the propeller
m. Apply one even coat of EC-539 (Minnesota Mining
blades where ice would normally adhere.
This heat,
& Mfg. Co. ). mixed per manufacturer's instructions,
plus centrifugal force and the blast from the airstream.
around the edges of the installed boot.
removes accumulated ice. Each de-icer has two sep-
n.
Remove masking tape from the propeller and
arate electrothermal heating elements, an inboard
clean the surface of the propeller by wiping with a
section and an outboard section. When the switch is
clean cloth dampened with toluol.
turned on, the timer provides power through the brush
o.
Install restrainer strap as shown in detail in
block and slip ring to outboard elements for approxi-
figure 14-6, sheet 4. Start strap approximately in
mately 30 seconds, reducing ice and adhesion in these
location shown in detail so a double thickness is
areas. Then the timer switches power to inboard
over lead strap of the de-icer.
The lead strap must
heating elements for approximately 30 seconds.
It
not be twisted more than one turn (180°) in lining
then returns to the outer elements and continues
up the respective leads.
Trim restrainer strap so
cycling action. This outboard-inboard sequence is
it will end approximately as shown in the detail.
very important since the loosened ice, through centri-
p.
Secure electrical leads of restrainer strap with
fugal force moves outboard.
Heating may begin at
screws, washers and sleeves.
any phase in the cycle, depending on timer position
when the switch was turned off from previous use.
14-64.
PROPELLER DE-ICE SYSTEM.
(McCauley,
Ground checkout of the systems is permitted when
3-Bladed Propeller Installation.)
(See figure 14-7.)
the engine is not running. System components may
be removed and replaced, using the figure as a guide.
14-65.
DESCRIPTION.
The system is of an elec-
Propeller removal is necessary before de-ice com-
trothermal type. consisting of electrically heated
ponents, except brush block assembly, can be in-
de-icers bonded to each propeller blade, a slip ring
stalled or removed.
14-25
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Table of Contents
Troubleshooting
