Engine

Question 1

How many of what type of spark plugs do the PT6A-67D engines use?

Answer 1

Two spark type igniters per engine.

Question 2

When the auto ignition is armed below what torque do the igniters activate?

Answer 2

750ft/lbs torque

Question 3

To what SHP is the PT6A-67D engine flat-rated to?

Answer 3

1279 SHP

Question 4

ow much air do the PT6A-67D engines use to centre the flame in the combustion chamber?

Answer 4

75%; the rest is used for combustion.

Question 5

By what is the engine intake lip heated?

Answer 5

Engine exhaust air.

Question 6

To what is the minimum fuel flow stop in the FCU set to?

Answer 6

90lbs/hr per engine

Question 7

From where does the FCU receive inputs from?

Answer 7

• N1 flyweight governor
• prop lever
• condition lever
• power lever
• pneumatic bellows

Question 8

Are the axial compressors more effective at low or high speeds?

Answer 8

Low speeds

Question 9

If no ITT raise is indicated within ….. seconds after introduction of fuel, the start should be aborted.

Answer 9

10 seconds

Question 10

When does the P2.5 compressor bleed valve start to close?

Answer 10

72% N1

Question 11

Why does the P2.5 compressor bleed valve close at higher RPM’s?

Answer 11

It is open in first place to allow air to escape the compressor stage as this would introduce too much air into the combustion chamber. As RPM’s are increased the engine can cope with higher air intakes.

Question 12

During a power increase, what indications will lead us into the conclusion that the compressor bleed air valve is failed in the open position?

Answer 12

• Higher ITT

- Lower torque

Question 13

If the OIL PRESS LO annunciator comes on and the memory items have been completed, what torque setting should not be exceeded?

Answer 13

2000 ft/lbs.