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44 Cards in this Set
- Front
- Back
- 3rd side (hint)
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True or false ? Pneumatic systems are simple and light weight ? |
Tried |
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For high pressure how much psi is stored in steel bottles ? |
1000-3000 psi |
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How many stage Ls are compression |
2 or 3 stages |
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What is purpose of check valve ? |
Makes air flow in one direction |
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What is psi for medium pressure systems |
100-150 psi |
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What kind of air does medium pressure allow |
Bleed air from the JET/turbine engine |
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What are two types of vane pumps |
Wet and dry |
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9. Early pneumatic flight instrument systems used suction to pull air into the instrument case to spin the gyros, but modern systems use: |
A. Regulated engine-bleed air. B. Engine-driven, vane-type pumps. C. Electric-driven gyros. D) All of the |
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True or false pneumatic systems are like hydraulic systems where they use reservoirs , hand pumps and accumulators |
False |
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What do hydraluic and pneumatic systems have in common |
Check valves |
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What protects the seal in pneumatic systems |
Relief valves |
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What are two types of filters used |
Screen type and micro if |
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What is the speed regulator called in a pneumatic system |
Restrictor |
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What is difference between screen filter and micronic filter |
The screen type filter contains permanent wire screen instead of replaceable cartridge |
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True or false One advantage of a dry-type vacuum pump is that it can be employed in a pneumatic system to operate in vacuum or pressure modes. |
True |
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G |
H |
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Vane type |
Low presstr |
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What does isolation valve do? |
Allows technician to close off sit supply |
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1000 psi serves as a |
Backup relief valve |
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How is a screen-type pneumatic filter cleaned? |
By turning a handle on the top that scrapes |
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some European turboprop-powered commercial aircraft, pneumatic systems are installed that use: |
Two stage ENGINE DRIVEN |
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After compression occurs, the air is routed to: |
Back into the cylinder |
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Vane type |
Low presstr |
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What is disadvantage of bottles |
Can’t be recharged in flight |
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Medium pressure air provides relatively ___ volumes of air with ___ pressure |
Large , low |
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What is big difference between wet vacuum vane pump and dry vacuum came pump |
Wet vac has the oil separator |
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What are benefits of a dry pump |
More modern and require no external lubricants, uses carbon |
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What is purpose of relief valve |
Prevent excess pressure |
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D |
D |
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What does isolation valve do? |
Allows technician to close off sit supply |
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1000 psi serves as a |
Backup relief valve |
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How is a screen-type pneumatic filter cleaned? |
By turning a handle on the top that scrapes |
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some European turboprop-powered commercial aircraft, pneumatic systems are installed that use: |
Two stage ENGINE DRIVEN |
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After compression occurs, the air is routed to: |
Back into the cylinder |
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True or false pneumatic systems can be used for positive air pressure in the cabin at high altitudes |
True |
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What are the advantages of using compressed air over hydraulics |
Air is abundant Simple and light weight reduced explosion hazard |
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What psi is low pressure |
Less then 100 psi |
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What is purpose of a restrictor and what are two types |
The purpose is to impede and slow down the speed of air by using a large inlet port and a small outlet port for orifice |
C |
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What are two types of filters |
Micron filter and screen type filter |
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What kind of screen does micronic screen have |
Wire screen mesh |
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Why is it important for a compressed air system to have a moisture separator and where does the moisture go |
The moisture freezes which damage the air compressor and cause it disfunction also it gets stored and throw overboard |
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What does the shuttle valve allow |
It allows the pneumatic system to operate from a ground source and is also emergency back up for hydraulically operated landing gear |
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How does the emergency backup gear extension work? |
It uses compressed air stored in an emergency cylinder , When cylinder air is released it moves the shuttle valve closing off the hydraulic system so air doesn’t enter that system |
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When the pilot is sure he has no hydraulic brake pressure to the brakes he can rotate the pneumatic brake handle ____ to increase brake pressure |
Clockwise |
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