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21 Cards in this Set
- Front
- Back
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What functions does the pneumatic system primarily serve?
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Supply of bleed air for the air conditioning, pressurization, and anti-icing systems. Also can be used for air driven hydraulic pumps.
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Where is bleed air typically drawn from?
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The high-pressure or low pressure engine compressor section.
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Can one engines bleed air be provided to another aircraft side?
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Yes, all systems are connected by a manifold, but can be isolated using an Isolation Switch.
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For anti-icing purposes, where is bleed air typically used?
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Leading edge of the wing and associated devices, engine nacelle and inlets, and sometimes antennas.
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What components are typically electrically de-iced?
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Probes, cockpit windows, stall warnings, drain points, and propellers on turbo-props.
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How are aircraft de-iced on the ground, prior to take-off?
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Via the use of fluids sprayed onto the aircraft.
Type 1 fluid, low viscosity, high glycol content. Type 2 fluid, thickened, less prone to running off and often used where the taxi time is quite long. |
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On the 767, is wing anti-icing available on the ground, and what controls this decision?
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No, the air/logic system does not allow its activation.
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During the use of bleed air for anti-ice, does anything need to be corrected for in regards to the engine?
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Yes, EPR needs to be corrected, and is done automatically by obtaining information from the anti-ice valve position.
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When engine anti-icing is switched on, what else is automatically on and why?
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Engine ignition, to prevent engine flame-out due to ice ingestion.
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How is rain repellant used?
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One windshield at a time, pressing the appropriate button delivers a measured dose. Each window's system is independent of the other.
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A typical pressurization system on a jet airliner keeps the cabin at approximately what altitude?
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8,000 feet.
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What rate of ventilation and humidity is required as a minimum?
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1lb per person per minute.
30% humidity. |
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A cabin altitude warning horn sounds above what cabin altitude, and above what cabin altitude do the masks drop down?
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10,000 feet and 14,000 feet.
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What is a standard airliners Max Diff?
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8 - 9 PSI
(8,000 CA for an Service Ceiling of 40,000) |
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What could potentially happen if Max Diff is exceeded?
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Structural damage could occur.
Positive pressure relief valve prevents this. |
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What will a negative pressure relief valve do?
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Allow air to flow into the cabin if it detects that the cabin pressure drops below outside pressure.
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When the Electronic Cabin Pressure Controller is set to Auto, what data is the pilot only required to input?
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Initial cruising altitude and landing elevation.
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What is the purpose of the FLT/GRD switch?
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GRD drives outflow valve open, keeping cabin de-pressurized.
FLT pressurizes cabin to -200ft to start off with, making changes easier for passengers. |
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What are the two main types of air conditioning systems in use in aircraft today?
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1. The vapor cycle (closed cycle)
2. The air cycle (open cycle) |
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Provide a brief description of how a vapor cycle system works?
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Vapor (which liquefies) is passed around the system and through a condenser. In the condenser, the vapor is compressed to a liquid, and the heat it has absorbed is extracted.
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In an air conditioning system, what is a Ram Air Valve?
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A valve that allows outside air into the cabin, in conjunction with a fully open outflow valve, to provide circulation.
Only used in unpressurized situations!! |
