M15.13 Starting And Ignition Systems Flashcards
Main engine control
- Engine start
- FWD thrust controls
- Reverse thrust controls
What occurs when the engine start lever is turned on
Ignition and fuel supply are turned on
What allows fuel to flow to the combustion chamber
HP and LP shut off valve
Along with the start sequence what also controls the LP fuel valve
Engine fire switch
What does an amber valve indicate on ECAM
Emergency closure of the valve
When is the HP fuel valve solenoid energised
When the HP shut off valve is closed
What can be the issue with a dual coil solenoid at the HP valve
If there is a short it could close even at idle
What creates internal friction to keep the throttle control system in a selected position
Friction brake
What prevents the pilot increasing power until the thrust reverser is fully deployed
Throttle interlock system
What system prevents both FWD and reverse thrust being activated at the same time
Lever lock system
Electrical thrust controls use how many signals for safety
Two per throttle lever
What converts the angular deflection of the input lever to an electrical signal
A resolver
Thrust reverse main positions
- Normal
- Reverse idle
- Full reverse
Where is the reverse signal sent to electrically
ECU
Why would an aircraft not have a throttle interlock system
On FADEC aircraft
FADEC can monitor the deployment and not increase fuel flow until fully deployed
When would you find throttle interlock systems with FADEC
Four engine aircraft
Ignition system modes
- start
- Continuous
What ignition system is active during continuous ignition
Both A and B
Purpose of ignition exciter
Transform low voltage to higher voltage for ignition
What does the ignition exciter convert
115v to 2000v
What does the exciter do
Convert low to high voltage then AC to DC
How does the exciter rectify AC to DC
Diodes
Why is it important to check igniter plug immersion depth
- Safe operation
- Max service life
Parts of an igniter plug
- Outer shell
- Insulator
- Centre electrode
How is the temperature at the tip of the igniter plug decreased
Combustion cooling air enters the holes in the plug into the outer shell and out the tip
What do 2 blue rings on an igniter plug signify
Insulation is made from beryllium oxide (toxic)
What is the light up speed
When the fuel air mixture ignites
When does the engine starter switch off
When the engine is self sustaining
When does the start valve solenoid energise
Engine master switch is turned on
Generally when would the starter clutch disengage
When the engine runs faster than the starter motor
How is the starter motor cooled
Internal lubrication system
How is the starter motor manually opened
Handle that opens a poppet valve and allows the butterfly valve to be rotated
When is manual operation of the starter valve permitted
When there is air pressure in the start duct
How is damage to the start valve actuator prevented during manual operation
By only being manually turned when there is air pressure in the start duct
