Pt6 Engine & Prop.

Question 1

What engine is in the PC12?

Answer 1

PT6A-67B Reverse Flow Free Turbine.

Question 2

-67 HPower?

Answer 2

1600 HP de-rated to 1,200 HP Take off, 1,000 SHP max climb power.

TQ gauge lets you know you’re achieving these numbers.

Question 3

-67 internals

Answer 3

4 axial flow compressors/1 Centrifugal impeller. 1 compressor turbine/ 2 power turbines
2 igniters located at 4 & 9 o’clock.
14 injectors, 7 primary 7 secondary??

Question 4

What does the bleed air valve do?

Answer 4

The Bleed valve prevents compressor stall during low RPM and turbulences by bleeding inter-stage air between compressor assemblies.

Question 5

How does the fire detection work?

Answer 5

Fire detection: stainless steel tube wraps around the turbine. Tube is filled with helium and has a hydrogen filled chore. Heat expands the gases and trigger a pressure sensor (PIM 7-43)

Question 6

-67 oil system.
Capacity.
Quantity Alert.

Answer 6

Total capacity 3.6 US Gallons. Oil quantity alert is on the top of the dipstick.
Visually check oil level up to 10 minutes after a flight via the tank side glass.

Question 7

-67 Oil pumps?
Engine driven fuel pump?

Answer 7

1 engine driven oil pump, 4 scavenge pumps.
If External oil scavenge pump fails so will the Engine Driven Fuel pump as they share the same shaft.

Question 8

-67 chip detectors, location?

Answer 8

Chip Detector for the Reduction Gear Box, and 275SM also has a chip detector on the Accessory Box.

Question 9

Prop Control.

Answer 9

Works with Oil Pressure fighting a spring and flyweights to move the sliding piston.
The more oil pressure, the finer the pitch all the way to BETA.

Question 10

Prop control BETA/reverse.

Answer 10

In BETA the propeller reverse will move the beta (reversing) ring that will mechanically move the piston further forward allowing more oil in the piston than maximum fine pitch.