Everything

Question 1

Purpose of aircraft pressurisation

Answer 1

To allow comfortable and safe flying at high altitudes

Question 2

3 pressurisation modes

Answer 2

Rate mode - pressurises aircraft upto 8000ft

Isobaric mode - holds cabing pressure at 8000ft while aircraft can continue to change altitudes

Constant differential mode - maintains a set pressure differential during flight

Question 3

Aircraft pressurisation achieved by what 3 methods

Answer 3

Compressor bleed air from engine
Engine driven compressor
ground supply

Question 4

2 ways pressurisation control systems are operated

Answer 4

Pneumatically

Electrically

Question 5

3 cockpit indicator instruments

Answer 5

Cabin altitude
Cabin rate of climb
Pressure differential

Question 6

What controls cabin outflow valve

Answer 6

Pressure regulator

Question 7

What is the purpose of a an aux vent valve?

Bonus what else can do this

Answer 7

When weight on wheels the valve opens to atmosphere to equalize pressure.

Bonus: most electronic outflow valves do the same

Question 8

Purpose of safety valve

Answer 8

To stop over pressurisation of the aircraft. Doesn’t allow max PD to be reached

Question 9

Temperature and pressure at sea level

Answer 9

59F or 15C

14.69 PSI

Question 10

Sealing of axial and radial control tubes

Answer 10

Axial use felt or leather glands packed with grease

Radial use a rubber seal attached to control tube

Question 11

6 SAFETY WITH CABIN PRESSURE TESTING

Answer 11

1. Safety man outside AC
2. Audio/visual contact between safetyman and crew
3. AC to be fully depressurised before opening of windows, doors, hatches
4. Person carrying external Leak check exercise care when around hatches, windows, doors
5. Person suffering cold/sinus symptoms not allowed in pressurized cabin
6. Decompress sickness, personal are to wait 12hrs before flying and diving

Question 12

Explain de ice

Answer 12

De ice is the removal of built up ice. Can be done through heat (pneumatic or electric) or pneumatic boots

Question 13

Explain Anti ice

Answer 13

The prevention of ice build up. Use electric thermal, hot oil, hot pneumatic air, chemical means of prevention

Question 14

3 methods of rain removal/prevention

Answer 14

Wipers
Pneumatic
Chemical

Question 15

How are de ice boots held to LE when not in use

Answer 15

Vacuum

Question 16

Material of ducting for Aircon system

Answer 16

Stainless steel, anconel

Question 17

3 elements aircon system control

Answer 17

Temperature
Humidity
Ventilation

Question 18

Components of a air cycle system

Answer 18

Primary heat exchanger
Compressor
Secondary heat exchanger
Turbine 
Water seperator
Shut of valve
Temperature control valve
Refrigeration bypass valve

Question 19

Purpose of refrigeration bypass valve

Answer 19

Keep air exiting ACM from freezing. Keeps air at 35F or 2C.

Passes warm bleed air around ACM and mixes at output of ACM.

Primary purpose is to prevent water from freezing in water seperator

Question 20

Function of temperature control valve

Answer 20

Controls amount of bypassed air from ACM.

Secondary can direct air into entry point of water seperator to prevent freezing

Question 21

Types of ice detection

Answer 21

Visual
Electronic
Optical

Question 22

2 types of leakage

Answer 22

Controlled

Uncontrolled

Question 23

What is controlled leakage

Answer 23

The allowance of air to leave the aircraft via the outflow valve or safety valve

Question 24

Passenger airline pressurisation rate of climb and decent

Answer 24

Rate of climb at 500fpm

Decent at 300fpm

Question 25

2 modes of operation of pressurisation system

Answer 25

Automatic

Manual

Question 26

Purpose of a shut off valve

Answer 26

Control the airflow into the aircon system