-1 pitot probe
-2 static probes
-
1 alpha probe
-
1 TAT probe.
(2)
The F/O channel is the same as the CAPT channel.
(3)
The STBY channel has:
-1 pitot probe
-2 static probes
-1 alpha probe.
(Ref. Fig. 006, 007, 008)
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Engine Anti-Ice - Schematic Figure 004
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Engine Anti-ice - Controls and Indication Figure 005
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Probe Ice Protection - Schematic Figure 006
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Pitot and Static Probes Heating Figure 007
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Alpha and TAT Probes Heating Figure 008
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(4)
Pitot Probes
The pitot probes have electrical heat elements in the main body and in the inner surface of the cavity in the mast. When the aircraft is on the ground, the Control and Monitoring Unit (CMU) automatically decreases the temperature level.
(5)
Static Probes
The static probes have electrical heat elements in the edge of the orifice.
(6)
Alpha Probes
The alpha probes have internal solid-state heat elements in the vane and in the case heater.
(7)
TAT Probes
The only part of the TAT probe that gets hot is the leading edge of
the air intake. When the aircraft is on the ground, the TAT probe
electrical supply is automatically isolated by the CMU.
The voltage that supplies the pitot probes, the alpha probes and the
TAT probes is 115V AC. The voltage that supplies the static probes is
28V DC.
(Ref. Fig. 009)
(8) The probe heat systems are automatically energized when the first engine is started. The PROBES/WINDOW HEAT P/BSW, on the overhead panel 25VU, can be pushed in (on) if probe heat is necessary before engine start.
D. Windshield Anti-icing and Defogging (Ref. 30-42-00)
(Ref. Fig. 010, 011, 012)
The windshield anti-icing and defogging system keeps the windshield and side windows clear in ice or fog conditions. The system has two sub-systems, left hand and right hand, which operate independently. Each sub-system supplies heat to two side windows (one sliding and one fixed) and one windshield. Each window has two temperature sensors, one controls the temperature the other is spare. The windshield has three temperature sensors, one controls the temperature the other two are spare. The sensors control the temperature between 35 and 42 deg.C (95 and 107.6 deg.F).
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Probe Ice Protection - Control Location Figure 009
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Window Heat - Schematic Figure 010
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Windows - Typical Cross-section Figure 011
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Window Heat - Control Location Figure 012
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The windshield anti-icing and defogging system is automatically energized when the first engine starts. The PROBES/WINDOW HEAT P/BSW, on the overhead panel 25VU, can be pushed in (on) if the system is necessary before engine start.
E. Windshield Rain Protection System (Ref. 30-45-00)
(Ref. Fig. 013)
A wiper system removes rain from the cockpit windshield.
(1) Wiper System
There are two wiper systems which operate independently, one for the left hand and one for the right hand windshield. A three-position switch on the cockpit overhead panels 21VU and 22VU controls each system. The three positions operate the wipers as follows:
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