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31 Cards in this Set
- Front
- Back
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2 purposes of windshield heat?
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Increase impact strength and prevent fog and ice buildup.
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Where does the air for anti fog and defog for the windshield come from?
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Air conditioning mix manifold (w/ individual L/R controls)
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What windows are unheated?
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5th window on either side, aft of the side windows (#3).
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How prevent overheating of the drain masts on the ground?
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Lower voltage used on the ground; fnx of the air/ground sensor, but does not apply to toilet service panel drains.
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Does engine BLEED switch have to be on for cowl anti-ice to work?
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No, engine cowl anti-ice valve is upstream of the engine bleed air valve.
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What is total fuel burn increase with engine anti-ice on?
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150 pounds per hour
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Before and during use of engine anti-ice, what should you do?
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Turn ignition on.
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Describe operation of cowl a/i valve (3).
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-ENG ANTI-ICE switch to ON opens valve
-DC-controlled and pressure-actuated -fail closed |
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Blue COWL VALVE OPEN light means?
Amber COWL ANTI-ICE light means? |
-monitors position of the cowl a/i valve.
-excessive temp and/or press in the duct dwnstrm of the cowl a/i valve. |
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Where are the leading edge ice detection bands located? Are they required for flight during icing?
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Inboard portions of #1 and #6 leading edge slats (flat black paint). No.
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What pitot-static devices are heated and unheated?
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Heated: capt, f/o, elevator pitot static probes; temperature probe, and Alpha vanes
Unheated: alternate static ports |
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Can you use WAI on the ground?
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Only to test, otherwise, it is used in flight.
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Are the leading edge flaps heated?
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No, only the leading edge slats are heated.
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Where does the air come from for WAI?
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pneumatic manifold, therefore the engine BLEED air switches must be ON to use WAI.
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What is the restriction if only one engine bleed is available for WAI?
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Wings must be deiced evenly, so ISOLATION VALVE must be OPEN.
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What is the increased fuel burn for engine and wing anti ice on?
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400 lbs per hour total
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How are the WAI valves operated? What happens if transfer bus 1 loses power?
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AC motor driven open and closed. Valves fail in position.
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What prevents WAI operation on ground (besides test mode)?
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Air/ground sensor.
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What is the design consideration for the DC powered windshield wipers? When shouldn't you use them?
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Ensures visibility on at least one side if a generator fails. Dry windshield. Duh.
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3 conditions of the (WAI) L and R VALVE OPEN lights(blue).
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Dim: WAI valve is open and switch is either ON (in flight) or GRD TEST (ground).
Bright: WAI valve and switch are not in agreement or valve is in transit Off: valve is closed and switch is off |
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COWL VALVE OPEN lights (blue)?
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Bright: transition or not in agreement
Dim: switch on, valve open off: Switch off, valve closed |
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Windshield heat OVERHEAT lights indicate what?
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Either a power loss or an overheat, resulting in auto loss of electrical power to respective window.
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How do you reset windshield heat?
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Turn WINDOW HEAT switch OFF for 2-5 minutes, then turn back on.
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When window heat is first energized, how is the heat applied to the windows?
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Ramp function to fwd and side windows so it increases gradually from zero to full power in, about 3 minutes.
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How can you apply full power to the windows at start up.
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Turn switch off then on again within 5 seconds, this applies full power.
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What if it's hot out, what might you see?
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Green lights cycling or even off.
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Is it a good idea to apply full window heat?
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Not in very cold or fogging windows.
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Describe usage of WINDOW HEAT test switch.
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Use only on a window that has the WINDOW HEAT switch ON and associated ON light extinguished. If the ON light comes on during a PWR test, ops normal.
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What are the power sources for the fwd window heat?
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Respective generator busses. Side is offside generator bus.
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What monitors power to the windows?
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OVERHEAT and ON lights. No power monitoring for the eyebrow panels.
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Place the WAI switch to GROUND TEST, what happens?
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Opens both valves on the ground only. Shut automatically if probes detect an overheat. Probes disabled in flight.
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