Leap-1A - 74 & 80

Question 1

What supply of air is used to cool the ignition system?

Answer 1

VBV

Question 2

What is the maximum depth of the tip electrode?

Answer 2

6.25 mm

Question 3

What is the failsafe position of the SAV?

Answer 3

Closed

Question 4

What variables does the adaptive start depend on?

Answer 4

• OAT
• Core or nacelle temperature
• Time since shutdown

Question 5

How is adaptive start indicated?

Answer 5

COOLING flashes in green on ECAM SD with a countdown timer

Question 6

Describe a normal automatic start?

Answer 6

1. ENG MASTER ON - LPSOV & SAV open
2. N2 15% - IGN start
3. N2 20% - FMV & HPSOV open
4. N2 55% - IGN stop
5. N2 60% - SAV closed

Question 7

Under what conditions should a manual start be aborted?

Answer 7

• If starting takes longer than 15 seconds
• If EGT > 725°C
• If stabilised oil < 17 psi

Question 8

What are the starter duty cycles?

Answer 8

1. 3 consecutive cycles (2 minutes each) with a 60 second rest between each, 15 minutes before repeating
2. 5 minute cycle, 5 minute rest, 5 minute cycle, 10 minute rest
3. 15 minute cycle, 15 minute cooling period (borescope only)