71 Engine General

Question 1

What motors are installed in the aircraft?

Answer 1

PT6A-60A Free Turbine Type

Question 2

What does the PT6A-60A Compressor section consist of?

Answer 2

3 Axial stages and 1 centrifugal stage.

Question 3

How many fuel nozzles are fitted to the engine?

Answer 3

14 nozzles arranged in 2 sets of 7 (Primary and Secondary)

Question 4

What material is the engine mount made from?

Answer 4

4130 Chrome Moly

Question 5

Where are your engine heat shields located?

Answer 5

Just forward and aft of the engine compressor section.

Question 6

How many electrical harnesses are fitted to the engine?

Answer 6

3

Question 7

What is the purpose of the fuel purge system?

Answer 7

To burn any unused fuel from within the manifolds during engine shutdown.

Question 8

Where is the source of air for the fuel purge system?

Answer 8

compressor discharge air (P3) is routed through a filter/check-valve into the purge tank.

Question 9

Each engine utilizes two independent turbine sections

Answer 9

one driving the compressor in the gas generator section and the other (a two-stage power turbine) driving the propeller shaft through a
reduction gear box.

Question 10

The compressed air passes

through diffuser tubes which turn the air through 90 degrees in direction and

Answer 10

convert velocity to static pressure.

Question 11

The guide vanes make sure that the expanding gases

contact the

Answer 11

turbine blades at the correct angle, with minimum loss of energy.

Question 12

Various brackets are welded to the engine mount to

Answer 12

attach cowling and components adjacent to the

engine (Ref. Figure 1).