15.1.7 Perform Engines / APU System Operations and Procedures

Question 1

Why are we instructed to wait two minutes before selecting the battery switch OFF, after bringing the APU selector to OFF, when shutting down the APU?

Answer 1

To ensure we have fire detection capability throughout the APU shutdown cycle

Question 2

Prior to departure, we should not start the APU until?

Answer 2

30 minutes before pushback

Question 3

The APU can be started in-flight, and operated up to the airplane’s maximum certified altitude. Up to what altitude is bleed air available?

Answer 3

Up to 17,000’

Question 4

An APU start attempt has failed on the ground. How long must you wait until reattempting subsequent starts?

Answer 4

The starter duty cycle is a maximum of three consecutive starts within a sixty minute period

Question 5

During normal operations, the fuel for the APU is supplied from:

Answer 5

The left manifold forward AC pump, or a dedicated DC pump

Question 6

During engine start, max motoring occurs when?

Answer 6

Engine acceleration is less than approximately 1% in 5 seconds

Question 7

In the EEC normal mode, thrust levers can be moved to the forward stop and the engines will not exceed the maximum N1 (true or false?)

Answer 7

True

Question 8

Pushing in and rotating the engine start selector to the GND position does what?

Answer 8

• Arms ignition,
• Opens the start valve,
• Engages the starter,
• Closes the engine bleed valve (if open).

Question 9

At what % does the engine start selector move to the AUTO position during start?

Answer 9

50% N2

Question 10

How many ignitors for each engine?

Answer 10

2