Engine, propeller and associated systems

Question 1

What engine does the Texan use?

Answer 1

PT6-68 turboprop engine

Question 2

How much SHP does it produce?

Answer 2

1100

Question 3

How many stages are in the centrifugal flow compressor?

Answer 3

1

Question 4

How many stages are in the axial flow compressor?

Answer 4

4

Question 5

What are the 2 main sections of the engine?

Answer 5

Gas generator section and power turbine section

Question 6

What is the accessory gearbox driven by?

Answer 6

Gas generator shaft

Question 7

What is mounted underneath the reduction gearbox?

Answer 7

Combined chip detector and oil drain plug

Question 8

What is the PIU?

Answer 8

Propeller Interface Unit

Question 9

What are the three positions marked on the throttle quadrant?

Answer 9

OFF, IDLE and MAX

Question 10

What are the 4 functions of the PMU?

Answer 10

• Assist FMU with fuel metering to the engine
• Monitor engine parameters and prevent exceedances
• Command the FMU to set IDLE N1 @ 60% on the ground, 67% in the air
• Command the FMU to set IDLE NP @ 80% when above 10,000 ft (reduces propeller stress in spins)
• Monitor and schedule the start sequence

Question 11

What must you do when you see ST READY?

Answer 11

Count 3 seconds to see if the caption stays on

Question 12

Why will the PMU abort the start?

Answer 12

• If start takes too long (hung start)
• ITT gets too high (hot start)
• No light-up (no fuel flow or ITT rise)
• Battery busbar voltage goes too low

Question 13

Oil system capacity?

Answer 13

18.5 quarts

Question 14

Intentional zero G is limited to _ seconds

Answer 14

5

Question 15

What 2 methods can the PIU use to dump residual oil pressure in the prop to feather it quickly?

Answer 15

Prop servo valve
Feather dump solenoid valve