74 Ignition

Question 1

What does the ignition system consist of?

Answer 1

Solid state ignition exciter, 2 high tension leads, 2 spark plugs, energised by 28 vdc.

Question 2

What voltage range does the ignition system provide?

Answer 2

9-30 volts

Question 3

What would happen if one transformer network failed? or both igniters failed?

Answer 3

If one end of the network failed the other igniter would still be operative, if both igniters fail the capacitor in the network will discharge.

Question 4

How is the spark produced on the igniter?

Answer 4

Across the gap between the central conductor and the igniter shell (ground)

Question 5

What system is available if engine torque falls below a set figure?

Answer 5

Auto ignition system

Question 6

When is the auto ignition system used?

Answer 6

During take-off, landing, turbulence, and bad weather.

Question 7

Describe the operation of the auto ignition system.

Answer 7

Toggle switch set to arm (left subpanel), engine torque drops below 16%, pressure switch closes to provide power to igniters and IGNITION ON annunciator.

Question 8

What should be done if removing spark igniter from engine 6 minutes before last operation?

Answer 8

ground lead to airframe.

Question 9

what are the igniter spark rates?

Answer 9

.8 - 1.0 per second 9 volts, 1.4-4.0 seconds 30 volts

Question 10

Where are the igniters located?

Answer 10

4 & 9 O’clock positions