11.4.4 - Safety/warning - 3q

Question 1

Failure protection of automatic Max Diff. pressure controller is provided by what?

Answer 1

Question 2

Cabin altitude warning is provided by ?

Answer 2

Question 3

8,000 ft = ?
10,000 ft = ?
14,000 ft = ?

Answer 3

Question 4

Bleed mass flow controllers pressure sensing is located where?

Answer 4

Question 5

Air Con heater has an overheat, how is it rectified?

Answer 5

Question 6

Inward relief valve operate at negative differential pressure of what value (PSI)?

Answer 6

Question 7

What should be noted about the Packs and external air?

Answer 7

Question 8

Outflow valve closes at what cabin altitude?

Answer 8

Question 9

Safety Relief valve operates at what diff and how many are there?

Answer 9

Question 10

Blowout panels operate at what diff. pressure?

Answer 10

Question 11

Emergency Ram Air
* Outflow valve position?
* Ram inlet?
* Only done when diff. P?

Answer 11

Question 12

Answer 12

The ambient pressure from exceeding cabin pressure

Question 13

Answer 13

Cabin safety relief valves

Question 14

Answer 14

Open

Question 15

Answer 15

A cabin altitude pressure switch

Question 16

Answer 16

Outflow valves

Question 17

On most commercial passenger aircraft, an intermittent alarm will sound if the aircraft cabin altitude exceeds:
1/ 8,000 feet
2/ 10,000 feet
3/ 14,000 feet

Answer 17

2/ 10,000 feet

Question 18

Fluctuating cabin pressure maybe because of:
1/ uneven air supply
2/ sticking outflow valve due to contamination
3/ Temp control unit given an erratic signal

Answer 18

2/ sticking outflow valve due to contamination

Question 19

Ditching control is used to:
1/ achieve rapid depressurisation
2/ maintain cabin pressure at altitude
3/ close all outflow valves

Answer 19

3/ close all outflow valves

Question 20

Answer 20

sensing the pressure upstream of the valve

Question 21

Why carry out a pitot-static leak test using a test set, after completion of a cabin pressurisation leak rate test:
1/ the fuselage has stretched during the test pressurisation
2/ the system has to be purged of all nitrogen pressure
3/ the system needs to be re-assembled and tested

Answer 21

3/ the system needs to be re-assembled and tested

Question 22

An aircraft pressurization system will normally keep cabin altitude below what equivalent altitude?

Answer 22

10,000 ft

Question 23

The principle of Vapour Cycle Cooling in an air-conditioning system is based on what process?

Answer 23

Repeated process of sealed refrigerant that converts back and forth from liquid to gas to transport heat. This cyclic process is known as the '’Vapour Cycle’‘

Also known as ‘refrigeration system’ or ‘Freon system’

Question 24

Name five of the main components that make up the Air Cycle Cooling system pack of an aircraft air-conditioning system

Answer 24

1. Compressor - increases heat and pressure of bleed air
2. Heat exchanger - heat in air is transferred to ambient air
3. Turbine - takes energy from air cooling it further, uses this energy to drive compressor and cooling fan
4. Water separator - Absorbs the moisture from the air and re-uses it to make ambient air even colder by injecting it into stream
5. Pack anti-ice valve - can remove ice using warm air
6. Turbine bypass valve - controls output temperature along with RAM air inlet door

Question 25

Describe briefly the components and operation of the Vapour Cycle Cooling system of an aircraft air-conditioning system?

Answer 25

1. Compressor - Increases temperature and pressure to make system more efficient
2. Condensor - Refrigerant heat given up to outside ambient temperature
3. Reciever Dryer - Serves as a reservoir for the liquid refrigerant and contains Dessicant that absorbs any moisture in the system
4. Thermostatic/thermal expansion valve - regulates the amount of refrigerant liquid flowing into the evaporator
5. Evaporator - Hot air taken from the cabin and transferred into the refrigerant

Question 26

The pressurisation system of a modern jet aircrafts must be capable of accomplishing several functions to provide comfort and safety to the passengers. Describe these functions?

Answer 26