15.17, 15.18, 15.19

Question 1

What use turbo shaft engine

Answer 1

APU

helicopter

Question 2

Control devices found on helicopter

Answer 2

Collective stick

Question 3

How is APU accelerated to 100% RPM

Answer 3

Starter stops at 35%

Requires ignition up to 95%

Question 4

What non aviation machines use turbo shaft

Answer 4

Boats , tanks

Question 5

Do turbo shaft engines produce thrust

Answer 5

Some do up to 10%

Question 6

Type of engine of APU

Answer 6

Turbo shaft engine

Question 7

What services does APU provide

Answer 7

Electrical and pneumatic

Question 8

Electric and pneumatic altitude uses

Answer 8

Sea lever to 10,000 ft both electric and pneumatic

10,000 to 17,000 ft either electric or pneumatic ( not both )

17,000 to 35,000 electric only

Question 9

When does APU reach self sustaining speed

Answer 9

95% RPM

Question 10

Purpose of APU de oiling valve

Answer 10

Help improve APU start , reduces load on starter motor

Question 11

Type of compressor used on APU

Answer 11

Centrifugal

Question 12

How is fuel controlled on APU

Answer 12

FCU ( fuel control unit )

Question 13

What happens when APU is in overspeed condition

Answer 13

It will shut down automatically

Question 14

Does APU need CSD

Answer 14

NO

Question 15

Which fuel tank does APU use

Answer 15

Main fuel tank

Question 16

What are fireproof bulkheads made of

Answer 16

Stainless steel , titanium, thermoplastic

Question 17

2 main lifting points of engine

Answer 17

Both on top of engine

One attached to fan case and one attached to turbine frame

Question 18

Where are flexible lines used

Answer 18

High vibration areas

Question 19

How to get rid of fuel after wet start

Answer 19

Excess fuel will gather at bottom of tank and drain valve is spring loaded open and fuel will drain safely

Question 20

Bootstrap system

Answer 20

Type of self contained lifting kit used to handle the lowering and raising of the engine

Question 21

What’s a power plant

Answer 21

Fully equipped engine

Question 22

What are stub wings

Answer 22

Side pylons for rear fuselage mounting

Question 23

How is diameter of flexible and rigid ripe measured

Answer 23

Flexible = inside 
Rigid = outside