Turbine Ignition & Starting

Question 1

What is the turbine engine starting sequence?

Answer 1

Starter > Ignition > Fuel

Question 2

The result of more fuel in a turbine engine:

Answer 2

More speed.

Question 3

What does it mean to perform a check?

Answer 3

Verify operation

Question 4

What is a hung start?

Answer 4

The turbine engine will not accelerate to self sustaining speed.

Question 5

What is a hot start?

Answer 5

Turbine engine EGT exceeds the max limit.

Question 6

When is a hung start likely to occur?

Answer 6

When the starter is disengaged too soon.

Question 7

When is a hot start likely to occur?

Answer 7

When the fuel is introduced to early.

Question 8

How many exciter units are required by Far 33?

Answer 8

Two.

Question 9

Two heat introduction methods in turbine engines:

Answer 9

1) Igniters
2) Glow Plugs.

Question 10

The component that releases the charge in an exciter unit:

Answer 10

Trigger capacitor

Question 11

A schedule that allows a device to operate for a given period of time, followed by a cool down period before the device can be operated again:

Answer 11

Duty cycle

Question 12

T/F
Exciters are normally not serviced in the field.

Answer 12

True.

Question 13

T/F
Input voltage to an exciter may be A/C or D/C.

Answer 13

True.

Question 14

All exciters are ______ capacitance discharge.

Answer 14

High tension.

Question 15

Relights the engine in the case of a flame out:

Answer 15

Auto-ignition system

Question 16

The ______ drains energy from the capacitor of an exciter after power is cut off.

Answer 16

Bleed resistor

Question 17

Benefits of turbine igniters over spark plugs:

Answer 17

1) No fouling (due to hotter burn)
2) Longer life (not running constantly & no direct flame exposure)

Question 18

T/F
Starters have no fuse.

Answer 18

True

Question 19

Process for disconnecting lead from an exciter or igniter:

Answer 19

1) Pull circuit breaker (lock out)
2) Disconnect power lead to the exciter.
3) Wait the MM specified time.
4) Remove igniter lead and ground to engine.

Question 20

Provides the compressed air needed for starting most jet transport airplanes:

Answer 20

APU

Question 21

3 types of air supplies for air turbine starters:

Answer 21

1) APU
2) GPU
3) Cross flow from other engine.

Question 22

The starter motors which compressor?

Answer 22

N2 (high pressure compressor)

Question 23

Two ways a butterfly valve for a pneumatic starter is operated:

Answer 23

1) Manually with a t-handle Allen wrench.
2) Via fly weight controls.

Question 24

Two methods of protecting the pneumatic starter from over speeding:

Answer 24

1) Choke nozzle slows incoming air.
2) Sheer section air supply is not shut off.

Question 25

What component activates the auto ignition?

Answer 25

Bellows.

Question 26

What to look for when inspecting a starter:

Answer 26

1) Brush damage and wear. 2) Signs of arcing. 3) Commutator damage. 4) Solder missing.

Question 27

Primary advantage of an air turbine starter:

Answer 27

Low weight to torque ratio.

Question 28

The type of starter used by most small business jet turbine engines:

Answer 28

Starter generator

Question 29

Types of combustion starters:

Answer 29

1) Cartridge 2) Gas turbine

Question 30

Where is the APU located?

Answer 30

Tail cone

Question 31

Two things supplied by APU:

Answer 31

1) Electrical power 2) Compressed air

Question 32

What controls the fuel on most APUs?

Answer 32

FADEC

Question 33

Main components of a turbine engine ignition system:

Answer 33

1) Exciters 2) Leads 3) Igniters

Question 34

What type of DC motor is commonly used for recip engine starters and why?

Answer 34

Series wound, because it has a higher starting torque under heavy load conditions.

Question 35

3 types of electric starters for general aviation aircrafts are starters with:

Answer 35

1) Overrunning clutch 2) Bendix drive 3) Right angle drive adapter