18 Questions
What is the purpose of the High Energy Ignition Unit (HEIU) in a gas turbine engine system?
To dissipate energy as high-voltage, high-amperage discharge across the igniter plug
Which type of ignition system receives power from the aircraft AC bus?
High tension current system
What does the term 'duty cycle' refer to in the context of ignition systems?
The time limit placed on the operation of the ignition system
Where does a low tension current system receive its power from in a gas turbine engine?
Battery bus
What are the two common types of gas turbine ignition systems mentioned in the text?
Low tension (DC voltage) and high tension (AC voltage)
How do igniter plug types vary between engine designs?
Based on their position within a combustion chamber
What is the purpose of a continuous duty cycle ignition system in an aircraft?
To provide continuous engine relight capability during critical flight manoeuvres
In what situations would aircrew typically select just one igniter plug?
During cruise flight when delayed engine relight is not critical
What is a common feature of both AC and DC igniter systems?
They contain similar components
Why are gas turbine engines typically equipped with a dual high energy ignition system?
To provide redundancy in case one system fails
Which component of an ignition system is responsible for controlling the flow of high energy current to the igniter plugs?
Ignition relay
What is the main difference between a DC bus and an AC bus ignition circuit breaker?
Operating voltage
What is the duty cycle of the ignition system based on the information provided?
2 minutes on, 3 minutes off
At what RPM range does the ignition system operate continuously according to the text?
16% to 65%
What happens when the engine speed goes above 65% based on the information provided?
The ignition system is de-energized
What component connects the HEIUs to the igniter plugs according to the passage?
High tension ignition leads
Which type of current is used to supply ignition voltage through the high tension ignition harness?
High tension current
What does the diode in this figure represent in the context of the ignition system operation above 65% RPM?
One-way valve
Learn about how each system is connected to a High Energy Ignition Unit (HEIU) and how electrical energy is stored and dissipated in igniter plugs within combustion chambers. Explore a basic ignition system electrical circuit.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
