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buses as shown in the table that follows. Power for indication is
provided by the Essential 28 VDC bus.
Windshield/Window Control Power Operating Power Voltage
Left Front Right Main AC, φC Right Main AC, φB
Right Main AC, φC
208 VAC
Right Side Left Main AC, φA Right Main AC, φC 115 VAC
Right Front Right Main AC, φC Left Main AC, φA
Left Main AC, φB
208 VAC
Left Side Left Main AC, φA Left Main AC, φA 115 VAC
(4) Windshield Heat Control Switch(es):
(See Figure 7.)
For airplanes SN 1000 through 1095 (except SN 1001) not
having ASC 239: A single WSHLD switchlight (cockpit overhead
panel, ANTI ICE HTR section) controls power to both windshield
heat controllers through two heat control relays: the left front/right
side relay and the right front/left side relay. Selection to ON
energizes the relays and extinguishes the amber OFF legend in the
switchlight. Once energized, the relays supply power to their
associated heat controller.
OPERATING MANUAL
2A-30-00 PRODUCTION AIRCRAFT SYSTEMS
Page 18
October 11/02
Revision 8
For airplanes SN 1001, SN 1096 and subsequent, SN 1000
through 1095 having ASC 239, and CAA certified aircraft: Two
WINDSHIELD switchlights, LF/RS and RF/LS (cockpit overhead
panel, ANTI ICE HTR section), control power to their associated
windshield heat controller through four heat control relays: left side,
left front, right front and right side. Selection to ON energizes the
associated relays, extinguishes the amber OFF legend in the
switchlight and supplies power to the associated heat controller.
(5) Window Heat Advisory Lights:
(See Figure 8.)
With windshield heat selected ON and the heat controllers supplying
power to the windshield/window heating media, the LEFT FRONT,
LEFT SIDE, RIGHT FRONT and RIGHT SIDE WINDOW
annunciators (cockpit overhead panel) illuminate green to signal that
heat is being applied to the window. The annunciators extinguish
when the associated window reaches its normal operating
temperature, and continue to cycle between illuminated and
extinguished as heating power is applied and removed from the
windshield/window heating media.
Each annunciator capsule contains four bulbs. Receiving power
from the Essential 28 VDC bus, they are tested and controlled using
the airplane’s annunciator lights dim and test function.
B. Windshield Wiper System:
A pair of electrical windshield wipers remove precipitation from the left and
right windshields. Being independent of each other, the left windshield
wiper system receives power from the Essential 28 VDC bus; the right from
the Right Main 28 VDC bus. Each system consists of the following units
and components:
• Windshield Wiper Control Unit
• WIPER and LO/HI Control Switch
• Windshield Wiper Motor/Arm/Blade Assembly
(1) Windshield Wiper Control Unit:
The left and right windshield wiper control units each contain two
relays that control wiper motor operation and speed in conjunction
with the LO/HI control switch. A noise filter is incorporated to reduce
any radio interference generated by wiper motor operation.
(2) WIPER and LO/HI Control Switch:
(See Figure 9.)
Each windshield wiper’s operation and speed is controlled by a
dedicated WIPER switch and associated LO/HI switch (cockpit
overhead panel, WINDSHIELD WIPER section). The WIPER switch
controls 28 VDC power directly to one side of the associated wiper
motor and indirectly through the associated LO/HI switch and
control unit relays to the motor. Selection of the WIPER switch to ON
causes the associated wiper to operate at the speed determined by
the associated LO/HI switch position. The ON legend illuminates
blue.
With a wiper selected ON, selection of the WIPER switch a second
OPERATING MANUAL
PRODUCTION AIRCRAFT SYSTEMS 2A-30-00
Page 19
October 11/02
Revision 8
time extinguishes the ON legend in the switch and reverses the
wiper motor, moving the wiper arm/blade assembly to the park
position. Once in the park position, power is removed from the motor
circuit.
The LO/HI switch controls a pair of relays within the associated
control unit that manipulate the associated motor circuitry to achieve
the desired wiper speed. When high speed is selected, the HI
legend in the switch is illuminated blue.
(3) Windshield Wiper Motor/Arm/Blade Assembly:
The left and right windshield wiper motor/arm/blade assemblies are
mechanically identical, but mirror images of each other and for the
most part are not interchangeable. The left and right wiper blades,
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