Day 5 Progress Check Flashcards
Why is nitrogen used in emergency pneumatic systems instead of compressed air?
Nitrogen is inert and reduces the risk of combustion
What is the main function of vane-type pumps in low-pressure pneumatic systems?
To supply low-pressure air for operations like wing deicing boots
What is the function of a dump valve in an emergency pneumatic system?
It isolates the landing gear hydraulic system during emergency extension
Which system component prevents backflow of air in pneumatic systems?
Check valve
What happens when high-pressure nitrogen is used in a pneumatic emergency system?
It applies pressure to hydraulic fluid to operate landing gear or brakes
What is the primary purpose of moisture separators in pneumatic systems?
To remove moisture from compressed air
Which type of valve is responsible for controlling compressed air flow to emergency devices like air brakes?
Control valve
What should be done regularly to maintain the functionality of air bottles in a pneumatic system?
Drain and recharge them to release accumulated impurities
What is the purpose of relief valves in pneumatic systems?
To reduce air pressure when it exceeds safe levels
What is a common use of bleed air in medium-pressure pneumatic systems?
Pressurizing hydraulic reservoirs
What type of air compressor is used in aircraft pneumatic systems?
Compressors with two or three stages of compression
What is a key feature of medium-pressure pneumatic systems in aircraft?
They utilize engine bleed air for operations like engine starts and deicing
What is a key difference between pneumatic and hydraulic systems?
Pneumatic systems use air, while hydraulic systems use liquid for power transmission
Correct answer
How is air typically stored in high-pressure pneumatic systems?
In metal storage bottles between 1,000-3,000 psi
How does a restrictor in a pneumatic system control airflow?
By adjusting the flow rate to slow down actuating units
