Ignition And Starting Systems Flashcards
What is a shower of sparks ignition system?
An ignition system that uses an indication vibrator to send pulsating DC into a set of retard breaker points on one of the magnetos. This provides a hot and retarded, spark for starting the engine.
What is an impulse coupling and how does it work?
A impulse coupling is a spring loaded coupling between a magneto shaft and the drive gear inside the engine when the engine is rotated for starting the impulse coupling locks the magnet so it cannot turn the coupling up as the crankshaft continues and the piston top dead, the coupling releases and spins the magnet producing hot and retarded spark
What kind of electric starting system is used on many of the smaller turbine engines
A starter generator
Why are air turbine starter superior to electric starters for large turbine engines?
They are lightweight for torque they produce
Where does an air turbine starter get its air for starting the engines on a jet transport airplane?
From an APU GPU from a running engine
What prevents too high and air pressure for over speeding and air turbine starter
The air shut off and regulating valve
Where does an air turbine starter get its lubricating oil?
It has a self-contained lubrication system with the oil held in the starter housing
What device in an air turbine starter warns an aviation mechanic if there are any metal chips or particles in the oil
Magnetic chip detectors, worn of any metal contamination in the oil 
What is the function of the capacitor in a magneto?
The capacitor minimizes arcing at the breaker points and its speeds of the collapse of the primary current as the breaker points
What happens in a magneto ignition system when the ignition switch is placed in the off position
The primary circuit is connected to the ground
What is checked when a magneto is internally timed
Internally timing, a magneto consist of adjusting the breaker points so they will open at the instant the rotating magnet is in its E gap position and the distributor rotator is in position to direct the high voltage to cylinder number one
In what position should the ignition switch be placed when using a timing light on the magnetos?
In the both position
What is the E gap in a magneto timing?
The E gap angle is the position of the rotating magnet where the primary current flowing in the magneto coil is the greatest
What malfunction in the ignition system would cause an aircraft reciprocating engine to continue to run after the ignition switch is placed in the off position
The ignition switch is not grounding, the magnet primary circuit
What type of ignition system is used on most turbine engine?
High intensity, intermittent duty, capacitor, discharge ignition systems
How many igniters are used with most turbine engines?
2
What are two types of ignition systems used in turbine engines?
High voltage system and low voltage systems
With which type of turbine engine ignition systems is a glow plug igniter used
Low-voltage system
How is the strength of the magneto checked?
The magneto is put on a test stand and rotated at a specific speed. The breaker points are held open, and the primary current is measured the strength of the magnet determines the amount of primary current.
In what position is the magnet in the magneto when the greatest change in flux density in the coil core takes place
It is a few degrees beyond neutral position
In what position is the magnet in a magneto when the breaker points begin to open?
And it’s E gap position
What happens when they start switch for a turbine engine with a starter generator is placed in the start position
Current flows into the starter relay which closes an actuates, the ignition exciter
Current flows through the series coils of the starter generator and rotates the engine until it starts
What happens when the start switch for a turbine engine with a starter generator is placed in the run position
The starter relay opens
The generator field relay is closed
The output of the generator flows to the bus through the generator circuit breaker
What is indicated if the starter relay chatters rather than locks in when the start switch is placed in the start position?
The battery voltage is too low to supply enough current to hold the relay engaged
What is the purpose of the sheer section in a air turbine driveshaft?
The ratchet mechanism fails to release, and the engine drives the starter to a speed higher than it’s design. Speed section will break and disconnect the starter from the engine. 
