Power Plant

Question 1

As the power levers are being advanced for take-off, at equal Ng speeds, the right Tq is 7-8 lbs lower than the left. This could be caused by what?

Answer 1

The right engines compressor inter-stage bleed valve sticking open

Question 2

How many stages does the compressor rotor assembly of the PT6-A engine include?

Answer 2

One centrifugal and three axial stages

Question 3

Where do the propeller RPM and gas generator (Ng) speed gauges receive their power from?

Answer 3

The propeller tachometer generator and gas generator tachometer generator respectively (??)

Question 4

After exiting the FCU, fuel is divided into a primary line and a secondary line. To enter the secondary line the full must be of sufficient pressure to pass a minimum pressuring transfer valve. If this were to stick closed, what would be the result?

Answer 4

The engine would light-off and the Ng would increase to 30-40% and remain there (hung start)

Question 5

Fire warning is provided by what?

Answer 5

Illumination of the FIRE PULL handle light and a fire bell if installed

Question 6

At what Ng speeds should the compressor bleed valve be completely closed?

Answer 6

> 85% Ng

Question 7

The fire detection system uses what? What would the indication be if the fire bottle were discharged into the engine nacelle by pulling the T-handle?

Answer 7

Thermal sensors. The yellow disc would be blown out (if the fire bottle were to blow on its own due to high pressure the red disc would be out)