Book 8

Question 1

What is the master switch?

Answer 1

• Also called battery switch or alternator switch

- Controls all of the circuits in an aircraft electrical system

Question 2

In aircraft with an alternator installed how are the switches set up?

Answer 2

One half for operating the battery, which connects battery power to the bus bar
The other half for the alternator switch for energizing the alternator and connects the alternator field to the bus bar

Question 3

What would happen if you switched the battery off?

Answer 3

It would automatically switch the alternator off

Question 4

Purpose of fuses, circuit breakers, and overload switches?

Answer 4

Provide protection of the equipment from any electrical current overload, the fuse will blow or a circuit breaker will pop out and break the circuit so current can flow.
Prevent circuiting from overheating or catching fire

Question 5

What are overload switches?

Answer 5

Combined on/off switches and overload protectors. They will switch themselves off if they experience an electrical overload. (can be reset by thepilot.

Question 6

What causes a warning of a fire?

Answer 6

• Smoke detection
• Sensing of overheating
• Hydraulic leak

Question 7

CO2 as a fire agent?

Answer 7

Used extensively in fixed installations that discharge into freight and baggage compartments. Handheld may be used in the cabin (size must be in portion to the air space)

Question 8

Methyl Bromide (MD) as a fire agent?

Answer 8

Used extensively in engine bay extinguishers since it is more effective than Co2, it is very toxic and thus not used in the cabin.
Distinct brown colour

Question 9

The dry powder as an extinguishing agent?

Answer 9

Commonly used on held extinguishers and often provided in gallery areas.
The free-flowing powder which is very effective against liquids and electrical fires.

Question 10

Fire extinguisher bottles are fitted with thermal relief valves?

Answer 10

If the bottle becomes overheated and the internal pressure rises to the level where there is a danger of explosion, the contents are discharged overboard.
Visible red disc

Question 11

Constant flow oxygen set up?

Answer 11

• It is the simplest and cheapest
• Compromises of a cylinder regulator and a manifold system
• Cylinder stores the gaseous oxygen at about 2200 psi
• Regulator reduces the pressure to 20 and 75 psi
• This pressure is maintained until its empty
• Manifold installed into the aircraft and for a portable device installed with the regulator.

Question 12

What would the flow indicator indicate when oxygen is flowing?

Answer 12

Green

Question 13

What are altitude adjusting and altitude compensating systems

Answer 13

Sets appropriate flow for the desired altitude

ALtitude compensating does this automatically whereas altitude adjusting is done manually