Power Plant

Question 1

What powers the low pressure fans?

Answer 1

Low pressure Stator Vanes direct still expanding combusted gasses onto both the LP Turbines which in turn drives the N1 and compressor inner shaft.

Question 2

What do the high pressure turbines power?

Answer 2

HP Turbine drive the N2 compressor and the accessory drives via an outer shaft.

Question 3

What items are on the accessory gearbox / drive

Answer 3

Starbucks: 2 x Gens and 3 pumps

1. N2 Generator
2. Starter Generator
3. Hydraulic Pump
4. Oil Pump
5. Fuel Pump (FCU)

Question 4

What temp is considered a hot start?

Answer 4

550 deg C ITT and above.

Question 5

Describe a Hung Start

Answer 5

When the engine fails to reach its normal idle speed during the start sequence, resulting in the engine rotating slower than expected or stopping completely.

Question 6

Describe a No Start senario.

Answer 6

Occurs when an engine fails to initiate or ignite during the start sequence.

Note:
1. No RPM Increase
2. No rise in EGT or ITT
3. Starter motor continues running
4. No Fuel Flow