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circuit breaker panel. The ENG INLET switch in the
OFF position energizes both engine anti-ice valves to
the closed position. In the ON position, the ENG INLET
switch deenergizes the anti-ice valves thus allowing
them to open and furnish hot air to the engine inlet
for anti-icing. It also energizes the engine gearbox heater
blanket controller. The energized controller allows
115 vac to be supplied from the No. 1 essential ac bus
through the NOSE GRBX HTR circuit breaker on the
pilot overhead circuit breaker panel for the nose gearbox
heater blankets.
2.43.5 Rotor Blade De-Icing System. The rotor blade
de-ice three-position ON, OFF, and TEST toggle
switch, located on the pilot ANTI-ICE panel receives
28 vdc from the No. 3 essential dc bus through the
BLADE DE-ICE CONTR circuit breaker on the pilot
overhead circuit breaker panel. In the ON position, the
switch will provide 28 vdc power to the main rotor andtail
rotor de-icing controller and turn on the controller.
When the controller is turned on, it collects data from
the signal processor unit, ice detector/rate sensor, and
the outside air temperature sensor. If icing conditions
are present, the controller will energize the blade de-ice
control relay. The energized blade de-ice control relay
provides a ground to the blade de-ice contactor control
relay that receives 28 vdc from the No. 3 essential dc
bus through the BLADE DE-ICE circuit breaker. With
the blade de-ice contactor energized, 115 vat, 3 phase
power is furnished from Gen 2 through the blade de-ice
contactor to the de-ice controller. (Gen 1 will only furnish
power when an overload is sensed on Gen 2, and
the contactor is caused to trip). The de-ice controller
rectifies the 115 vac to 268 vdc ( ± 134 vdc) for the rotor
blade heaters. The main rotor blades receive ± 134 vdc
through slip rings at the main rotor distributor. The
main rotor distributor provides a sequential delivery to
the blade heater elements. In the TEST position, the
rotor blade de-ice switch provides that the controller
will complete one full cycle of the blade anti-ice circuits.
The tail rotor blades receive ± 134 vdc from the de-icing
controller through tail rotor slip rings. Power to the tail
rotor blade elements and main rotor blade elements is
controlled by the de-icing controller which times the
amount of current allowed to the blades for heating.
The de-icing controller will detect faults within the system.
When a fault occurs, the controller shuts off power
to the blades and illuminates the BLADE ANTI ICE
FAIL segment on the pilot caution/warning panel.
2-61
CAUTION
TM 1-1520-238-10
a. Rotor Blade De-Icing Rotary Switch Operation.
When the rotor blade de-ice system is operating,
the BLADE ON advisory light on the pilot ANTI-ICE
panel illuminates. The rotary switch above the ON,
OFF, and TEST toggle switch on the pilot ANTI-ICE
panel provides manual override. When the rotary
switch is turned out of the AUTO position, it permits
manual control to select conditions that provide manual
heating to the rotor blades for TRACE, light (LT)
and moderate (MOD) icing conditions.
2.43.6 Icing Severity Meter. An icing severity meter
(fig 2-34) is provided in the right portion of the pilot
instrument panel. An aspirated ice detector sensing
head, located on the doghouse fairing assembly, provides
input signals to a processor. These signals are
proportional to liquid water content (LWC). The signals
are sent to the icing severity meter to give the pilot a
numerical indication of intensity. The meter is marked
with both intensities and categories of ice accumulation.
A PRESS TO TEST switch is provided adjacent
to the meter. When this switch is pressed, the meter
pointer will move to 1.5. Both the BLADE de-ice and
the PITOT AD SNSR switches on the pilot ANTI-ICE
panel (fig 2-33) must be on for the ice detector/rate sensor
to operate properly.
Figure 2-34. Icing Severity Meter and
Press-to-Test Switch
2.44 RAIN REMOVAL.
Windshield wipers should not “be operated
when canopies are dry.
Scratches may result.
Two wipers are mounted on the canopy frame to wipe
the two-windshields. Both wipers are electrically driven
and are normally controlled by a four-position WSHLD
WIPER rotary switch on the pilot ANTI-ICE panel.
The pilot wiper moves horizontally and the CPG wiper
moves vertically. They receive 28 vdc from the emergency
dc bus through the WSHLD WPR circuit breaker
on the pilot overhead circuit breaker panel. TWO
speeds, HIGH and LOW may be selected by the pilot.
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