Starting Systems

Question 1

On large engines, where are the starters found?

Answer 1

Mounted to external gearbox

Question 2

How does the turbine help with the starting sequence?

Answer 2

Turbine helps starter till engine gets to idle

Question 3

What percent RPM can the turbine support the engine?

Answer 3

35%

Question 4

What is happening in the engine during a hot start?

Answer 4

Too much fuel, not enough air (EGT Rise)

Question 5

What happens during a hung start?

Answer 5

Engine fails to accelerate

Question 6

What should you do during a hung start?

Answer 6

Abort start

Question 7

Which types of starters are no longer in use because of their weight?

Answer 7

Single purpose starters

Question 8

What is the typical TBO of a starter-generator?

Answer 8

1000 hrs

Question 9

Where should you inspect a starter-generator?

Answer 9

Drive splines for wear

Brushes for length

Question 10

Which airplane uses an electric starter?

Answer 10

787

Question 11

What are the parameters of a Low Pressure Axial Flow air starter?

Answer 11

After Passing through a start valve, air passes through a set of Convergent Ducts (Turbine Nozzle Vanes)
Air speeds up turbine in starter to around 60-80K Rpm
Need separate oil supply, shear shaft, and ability to choke nozzle vanes
Sprag clutch disengages starter

Question 12

How long does the starter usually stay engaged?

Answer 12

Up to 40-45%

Question 13

How does a hot start happen?

Answer 13

Starter is disengaged following a “Light off”

Question 14

ATA chapter for starting

Answer 14

ATA80

Question 15

ATA chapter for electrical power

Answer 15

ATA24

Question 16

How do high-low pressure pneumatic starting systems get their power?

Answer 16

May be operated using conventional low pressure air from APU, Ground cart, or running engine. Or in special circumstances, an onboard bottle.

Question 17

Starters that use gas produced by the rapid burning of an explosive charge are called

Answer 17

Cartridge pneumatic starters

Question 18

Instead of having a starter mounted to the external gearbox, this starting system supplies high volume/low pressure air directly to the turbine wheel of the HP compressor

Answer 18

Air Impingement starting

Question 19

This system uses another turbine engine to start the larger engines

Answer 19

Gas turbine starter