Hello,
Attempt is the process that FADEC follows to start an engine . So when the pilot turns the MASTER switch on, the FADEC initiates a start attempt.
In case the engine doesn't start, FADEC can perform another attempt automatically ( the pilot does not have to do anything to the master switch).
If the engine still doesnt start , the crew turns the master switch off.
The action of turning the switch back on is a new cycle. This new cycle will include single or upto 3 start attempts by the FADEC depending whether the engine starts or not .
So, understanding the limitation with steps involved
1. Pilot turns the master switch on ( first cycle ) , the FADEC initiates the process of engine start giving 3 attempts ( 2nd and 3rd attempt if engine doesn't start the first attempt . this is automatic )
2. Engine fails to start , pilot turns the master switch off
3. Pilot waits for 20 seconds
4. pilot turns the master switch on - this becomes the second cycle .
Therefor :
Pilot action of turning the master switch off and then on is a cycle
FADEC internal procedure of starting the engine is called attempt .
hope this helps
For interesting content on A320 technical ( quiz, posts) , do check us out
Instagram : Childrenofmagenta_a320
Website :
www.compilottraining.com and click on pilot resources
Happy learning,
COM_A320