Podcast
Questions and Answers
What is the main purpose of the undercurrent controller in a starter-generator system?
What is the main purpose of the undercurrent controller in a starter-generator system?
- To provide backup electrical power
- To conserve aircraft battery power
- To ensure positive action of the starter (correct)
- To control engine speed
Which component in the undercurrent controller controls the operation of the motor relay?
Which component in the undercurrent controller controls the operation of the motor relay?
- Starter generator
- Engine starting circuit
- Undercurrent relay (correct)
- Motor relay
Why does the engine starting circuit shown in this figure only operate from external electrical power?
Why does the engine starting circuit shown in this figure only operate from external electrical power?
- To allow self-contained starting
- To conserve aircraft battery power
- Due to aircraft design limitations (correct)
- To ensure positive action of the starter
In the starter-generator system, what is the function of the motor relay?
In the starter-generator system, what is the function of the motor relay?
Why is it preferable to use external electrical power for engine starts instead of the aircraft battery?
Why is it preferable to use external electrical power for engine starts instead of the aircraft battery?
What action is taken to allow the use of external electrical power when there is not enough battery power to accelerate the engine?
What action is taken to allow the use of external electrical power when there is not enough battery power to accelerate the engine?
Which relay is energized to start the fuel pumps during the engine starting process?
Which relay is energized to start the fuel pumps during the engine starting process?
What is the role of the ignition relay in the starter-generator electrical circuit?
What is the role of the ignition relay in the starter-generator electrical circuit?
Why does the battery cut-out relay open the circuit to the B-4 relay during engine starting?
Why does the battery cut-out relay open the circuit to the B-4 relay during engine starting?
What effect does energizing the motor relay have on the starter-generator system?
What effect does energizing the motor relay have on the starter-generator system?
What type of motor is typically used in a starter system?
What type of motor is typically used in a starter system?
How is the torque of the starter motor transmitted to the clutch?
How is the torque of the starter motor transmitted to the clutch?
What does the starter jaw do before engaging the engine cranking jaw?
What does the starter jaw do before engaging the engine cranking jaw?
When does the starter motor automatically disengage?
When does the starter motor automatically disengage?
Which mechanism is used to disengage the starter drive from the engine drive?
Which mechanism is used to disengage the starter drive from the engine drive?
What is the purpose of the battery switch in the context of the starter-generator system?
What is the purpose of the battery switch in the context of the starter-generator system?
What role does the undercurrent relay play in the engine starting circuit?
What role does the undercurrent relay play in the engine starting circuit?
Why does the undercurrent relay close in the starter-generator system?
Why does the undercurrent relay close in the starter-generator system?
What happens when the undercurrent relay opens in relation to other components?
What happens when the undercurrent relay opens in relation to other components?
How does the start cycle continue once the start switch is released?
How does the start cycle continue once the start switch is released?
What is the fundamental characteristic of a starter motor?
What is the fundamental characteristic of a starter motor?
Which power sources are used for gas turbine starter motors?
Which power sources are used for gas turbine starter motors?
What does the engine start panel from a four-engine aircraft feature?
What does the engine start panel from a four-engine aircraft feature?
Why is the starting procedure for most gas turbine engines basically the same?
Why is the starting procedure for most gas turbine engines basically the same?
What is the function of the motor relay in a starter-generator system?
What is the function of the motor relay in a starter-generator system?
What is the purpose of the overrunning feature in the starter-generator system?
What is the purpose of the overrunning feature in the starter-generator system?
Why are starter-generator units desirable in gas turbine engines?
Why are starter-generator units desirable in gas turbine engines?
What role does the series winding play in a starter-generator unit?
What role does the series winding play in a starter-generator unit?
Why is it preferable to use external electrical power for engine starts instead of the aircraft battery?
Why is it preferable to use external electrical power for engine starts instead of the aircraft battery?
What component controls the operation of the motor relay in a starter-generator system?
What component controls the operation of the motor relay in a starter-generator system?
What is the purpose of rotating the engine during the starting process?
What is the purpose of rotating the engine during the starting process?
Why is an ignition system used during the engine starting process?
Why is an ignition system used during the engine starting process?
What is the role of a starting system when motoring over an engine without ignition?
What is the role of a starting system when motoring over an engine without ignition?
Why is it important to have a duty cycle for starter motors?
Why is it important to have a duty cycle for starter motors?
How are the ignition system and starting system coordinated during an engine starting cycle?
How are the ignition system and starting system coordinated during an engine starting cycle?
What is the function of an undercurrent controller in a starter-generator system?
What is the function of an undercurrent controller in a starter-generator system?
Why is external electrical power preferred for engine starts over using the aircraft battery?
Why is external electrical power preferred for engine starts over using the aircraft battery?
What is the primary reason for allowing the use of external electrical power when battery power is low?
What is the primary reason for allowing the use of external electrical power when battery power is low?
During an engine starting cycle, what effect does energizing the motor relay have on the starter-generator system?
During an engine starting cycle, what effect does energizing the motor relay have on the starter-generator system?
Why does the starter motor have a duty cycle in gas turbine engines?
Why does the starter motor have a duty cycle in gas turbine engines?
