ATA 80 - Engine Starting

Question 1

What is the engines self sustaining speed?

Answer 1

55% Ng

Question 2

When will the GCU disconnect the starter generator?

Answer 2

When Ng has reached 55%. (self sustaining speed)

Question 3

What is the maximum ITT for starting the engine?

Answer 3

175° celcius

Question 4

How is the starter generator powered?

Answer 4

From the PDU (Power Distribution Unit)

Question 5

Is there a temperature limit for battery start?

Answer 5

Yes, it must not be below -20°c

Question 6

Which duty cycle is applicable when starting with external power?

Answer 6

2 start attempts with three minutes cooling in between. Thereafter 25 minutes must elapse until a third attempt.

Question 7

Which duty cycle is applicable when starting with aircraft batteries?

Answer 7

2 start attempts with five minutes cooling in between. Thereafter 25 minutes must elapse until a third attempt.

Question 8

Which duty cycle is applicable when motoring?

Answer 8

3 ea 20-seconds ventilation runs with 30 seconds cooling time elapsed between each attempt. Thereafter one hour of cooling time is needed.