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14 Cards in this Set
- Front
- Back
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If all power is lost, ADG deployed, which window will have heat? |
Only the left side window. Its ran off the ESS Bus. |
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What happens during a fail-safe condition in the ADS probe heat system? |
Heat will be applied to probes. |
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What is the max amount of operation time allowed for window and windshield heaters on ground? |
3 minutes. |
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How many messages are displayed with probe heat off, on ground? In air? |
On the ground, 2. In the air, 12. |
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When WING A/ICE is selected to NORM or STBY mode, what indicates the system is on and and the wing LE are heating up? |
L HEAT and R HEAT lights on and a green WING A/ICE ON advisory message is displayed on the EICAS. |
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What are the indications of a successful wing anti-ice system test? |
L HEAT and R HEAT lights illuminated on A/ICE panel, green WING A/ICE TEST OK advisory message and red WING OVHT message on EICAS, and the wing overheat aural alert. |
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What causes the green ON light on ANTI-ICE COWL switch to come on? |
A pressure switch, downstream of the cowl anti-ice valve. |
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What is the difference in operation between the normal mode and stby mode of the wing anti-ice system? |
The stand-by mode is a degraded mode of operation and the wing a/ice valves are directly controlled by a thermal switch |
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How is ice detection accomplished? |
The frequency of the oscillator in the ice probe is reduced by the ice, which is sensed by a microprocessor. |
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With regards to enable logic of the Air Data Sensor heater controllers, when is probe heat enabled? |
When DC power to the controller is lost/removed. |
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Selecting the TEST switch on the ANTI-ICE control panel top the WING position will: |
Test the overheat and sufficient heat circuits of the wing anti-ice controller. |
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What is the function of the cowl anti- ice pressure switch? |
Provides cowl anti-ice valve position to the data concentrator unit (DCU) |
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What is the purpose of the microswitch on any 10th or 14th stage bleed air valve? |
To provide an indication when the SOV is 8 degrees from the closed position. |
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Why should the windshield/ window heat be left off on the ground? |
Because the windows are made of two layers with a soft inter-layer. Heaters installed in the inter layer can melt or burn the interlayer. |
