M15.13 Starting And Ignition Systems

Question 1

Main engine control

Answer 1

• Engine start
• FWD thrust controls
• Reverse thrust controls

Question 2

What occurs when the engine start lever is turned on

Answer 2

Ignition and fuel supply are turned on

Question 3

What allows fuel to flow to the combustion chamber

Answer 3

HP and LP shut off valve

Question 4

Along with the start sequence what also controls the LP fuel valve

Answer 4

Engine fire switch

Question 5

What does an amber valve indicate on ECAM

Answer 5

Emergency closure of the valve

Question 6

When is the HP fuel valve solenoid energised

Answer 6

When the HP shut off valve is closed

Question 7

What can be the issue with a dual coil solenoid at the HP valve

Answer 7

If there is a short it could close even at idle

Question 8

What creates internal friction to keep the throttle control system in a selected position

Answer 8

Friction brake

Question 9

What prevents the pilot increasing power until the thrust reverser is fully deployed

Answer 9

Throttle interlock system

Question 10

What system prevents both FWD and reverse thrust being activated at the same time

Answer 10

Lever lock system

Question 11

Electrical thrust controls use how many signals for safety

Answer 11

Two per throttle lever

Question 12

What converts the angular deflection of the input lever to an electrical signal

Answer 12

A resolver

Question 13

Thrust reverse main positions

Answer 13

• Normal
• Reverse idle
• Full reverse

Question 14

Where is the reverse signal sent to electrically

Answer 14

ECU

Question 15

Why would an aircraft not have a throttle interlock system

Answer 15

On FADEC aircraft

FADEC can monitor the deployment and not increase fuel flow until fully deployed

Question 16

When would you find throttle interlock systems with FADEC

Answer 16

Four engine aircraft

Question 17

Ignition system modes

Answer 17

• start
• Continuous

Question 18

What ignition system is active during continuous ignition

Answer 18

Both A and B

Question 19

Purpose of ignition exciter

Answer 19

Transform low voltage to higher voltage for ignition

Question 20

What does the ignition exciter convert

Answer 20

115v to 2000v

Question 21

What does the exciter do

Answer 21

Convert low to high voltage then AC to DC

Question 22

How does the exciter rectify AC to DC

Answer 22

Diodes

Question 23

Why is it important to check igniter plug immersion depth

Answer 23

• Safe operation
• Max service life

Question 24

Parts of an igniter plug

Answer 24

• Outer shell
• Insulator
• Centre electrode

Question 25

How is the temperature at the tip of the igniter plug decreased

Answer 25

Combustion cooling air enters the holes in the plug into the outer shell and out the tip

Question 26

What do 2 blue rings on an igniter plug signify

Answer 26

Insulation is made from beryllium oxide (toxic)

Question 27

What is the light up speed

Answer 27

When the fuel air mixture ignites

Question 28

When does the engine starter switch off

Answer 28

When the engine is self sustaining

Question 29

When does the start valve solenoid energise

Answer 29

Engine master switch is turned on

Question 30

Generally when would the starter clutch disengage

Answer 30

When the engine runs faster than the starter motor

Question 31

How is the starter motor cooled

Answer 31

Internal lubrication system

Question 32

How is the starter motor manually opened

Answer 32

Handle that opens a poppet valve and allows the butterfly valve to be rotated

Question 33

When is manual operation of the starter valve permitted

Answer 33

When there is air pressure in the start duct

Question 34

How is damage to the start valve actuator prevented during manual operation

Answer 34

By only being manually turned when there is air pressure in the start duct