Exam Review: Aircraft Pneumatic System

Question 1

What do Pneumatic systems not have that Hydraulics do?

Answer 1

Reservoir
Hand pump
Accumulator
Regulators

Question 2

What are the 3 types of PNEUMATIC systems?

Answer 2

LOW (1-10psi)
MEDIUM (50-150psi)
HIGH (1000-3000psi)

Question 3

Piston engines use what type and how do they get a supply?

Answer 3

Low pressure

Vane type pump (vacuum)

Question 4

What are LOW pressure systems used for?

Answer 4

Wing De-ice

Instruments

Question 5

Which system does not include bottles and uses bleed air for engine starts/deicing and also pressurizes the hydraulic resevoir?

Answer 5

MEDIUM pressure

Question 6

This type of system uses metal bottles and has 2 valves, and cannot be recharged during flight

Answer 6

HIGH pressure

Question 7

High pressure systems are mostly used for?

Answer 7

Emergency operation in landing gear or brakes

Question 8

What are the 2 valves attached to the high pressure system?

Answer 8

Charging valve

Control Valve

Question 9

This component is used for charging the bottles?

Answer 9

Air compressor

Question 10

Purpose of restrictor?

Answer 10

Reduce rate of flow = speed of actuator

Question 11

Purpose of the variable resistor?

Answer 11

corrects airflow

Question 12

2 types of filters used in a PNEUMATIC system?

Answer 12

Micronic

Screen

Question 13

This component is located downstream of the compressor?

Answer 13

Moisture seperator

Question 14

This component can be found in many locations, its purpose is to absorb any moisture in the system

Answer 14

Chemical drier

Question 15

A chemical drier cartridge should always be what colour?

Answer 15

BLUE

Question 16

What is PNEUDRAULICS?

Answer 16

Move the hydraulic fluid to the actuating unit using pressurized NITROGEN

Question 17

Pulling the emergency landing gear handle does what?

Answer 17

opens the outflow vale and releases nitrogen to the system

Question 18

Pushing the emergency handle does what?

Answer 18

Releases nitrogen overboard