Podcast
Questions and Answers
What is the fundamental characteristic of a starter motor?
What is the fundamental characteristic of a starter motor?
- High speed transmission
- Smooth acceleration from rest to engine self-sustaining speed (correct)
- Low torque production
- Limited engine rotation
What is a typical engine self-sustaining speed defined as?
What is a typical engine self-sustaining speed defined as?
- When the engine will continue to accelerate without assistance (correct)
- When the starting system is disconnected
- When the ignition system is activated
- When the engine stops accelerating
What features are present in the engine start panel from a four-engine aircraft?
What features are present in the engine start panel from a four-engine aircraft?
- Fuel and ignition switches, start button, indicator lights (correct)
- GPS navigation system
- Gear shift and speedometer
- Hydraulic and electric switches
Which of the following is NOT a type of gas turbine starter motor mentioned in the text?
Which of the following is NOT a type of gas turbine starter motor mentioned in the text?
What is the main purpose of an engine start selector switch on the multi-engine start panel?
What is the main purpose of an engine start selector switch on the multi-engine start panel?
What does a starter system indicator light on the multi-engine start panel indicate?
What does a starter system indicator light on the multi-engine start panel indicate?
What happens when the engine accelerates up to self-sustaining speed in terms of the starter motor?
What happens when the engine accelerates up to self-sustaining speed in terms of the starter motor?
Why do the pawls slip out of the tapered slots of the engine drive gear under the influence of the disengage springs?
Why do the pawls slip out of the tapered slots of the engine drive gear under the influence of the disengage springs?
Why are starter-generator units desirable in gas turbine engines?
Why are starter-generator units desirable in gas turbine engines?
What is the purpose of the heavy series winding in a starter-generator unit?
What is the purpose of the heavy series winding in a starter-generator unit?
How does a starter-generator unit function after the engine has reached self-sustaining speed?
How does a starter-generator unit function after the engine has reached self-sustaining speed?
Why does an overrunning feature exist in the engine start system?
Why does an overrunning feature exist in the engine start system?
What are the two types of starters mentioned in the text for gas turbine engines?
What are the two types of starters mentioned in the text for gas turbine engines?
Which type of starter involves the use of compressed air to start a gas turbine engine?
Which type of starter involves the use of compressed air to start a gas turbine engine?
What is the function of an electric starter in the context of gas turbine engines?
What is the function of an electric starter in the context of gas turbine engines?
Which type of starter can act as both a starter and a generator for a gas turbine engine?
Which type of starter can act as both a starter and a generator for a gas turbine engine?
What is the main advantage of an air impingement starter system for gas turbine engines?
What is the main advantage of an air impingement starter system for gas turbine engines?
In the context of gas turbine engines, what does the term 'start sequencing' refer to?
In the context of gas turbine engines, what does the term 'start sequencing' refer to?
What is the primary role of the actuator piston in the hydraulic starter system described in the text?
What is the primary role of the actuator piston in the hydraulic starter system described in the text?
At what engine rotational speed does the starter speed sensing switch open to reset the pilot valve in the hydraulic starter system?
At what engine rotational speed does the starter speed sensing switch open to reset the pilot valve in the hydraulic starter system?
What prevents damage from excessive air pressure in the hydraulic starter system?
What prevents damage from excessive air pressure in the hydraulic starter system?
What is the main function of the regulator piston in the hydraulic starter system?
What is the main function of the regulator piston in the hydraulic starter system?
When does the actuator return spring close the butterfly in the hydraulic starter system?
When does the actuator return spring close the butterfly in the hydraulic starter system?
What happens when the engine accelerates beyond self-sustaining speed in relation to the starter motor?
What happens when the engine accelerates beyond self-sustaining speed in relation to the starter motor?
What is the primary purpose of the series winding in a starter-generator unit?
What is the primary purpose of the series winding in a starter-generator unit?
How does a starter-generator unit function differently as a generator compared to a starter?
How does a starter-generator unit function differently as a generator compared to a starter?
What type of engines are electric starters primarily used on?
What type of engines are electric starters primarily used on?
In which situation would an electric starter-generator be used?
In which situation would an electric starter-generator be used?
What distinguishes an electric starter from an electric starter-generator?
What distinguishes an electric starter from an electric starter-generator?
Which engines are most likely to use an electric starter?
Which engines are most likely to use an electric starter?
What type of electric starter motor typically develops high starting torque?
What type of electric starter motor typically develops high starting torque?
How do electric starters differ from hydraulic starters in terms of power source?
How do electric starters differ from hydraulic starters in terms of power source?
Which component is NOT typically part of an electric starting system for gas turbine engines?
Which component is NOT typically part of an electric starting system for gas turbine engines?
How is the torque of the starter motor transmitted to the clutch in an electric starter system?
How is the torque of the starter motor transmitted to the clutch in an electric starter system?
What disengages the starter drive from the engine drive in some electric starters when the engine reaches self-sustaining speed?
What disengages the starter drive from the engine drive in some electric starters when the engine reaches self-sustaining speed?
How does the starter jaw engage the engine cranking jaw in an electric starter system?
How does the starter jaw engage the engine cranking jaw in an electric starter system?
What happens automatically once the engine of an aircraft reaches a specific speed in relation to the starter motor?
What happens automatically once the engine of an aircraft reaches a specific speed in relation to the starter motor?
In an electric starter system, what is responsible for moving the starter jaw to engage the engine cranking jaw?
In an electric starter system, what is responsible for moving the starter jaw to engage the engine cranking jaw?
What prevents the engine from driving the starter beyond its design speed?
What prevents the engine from driving the starter beyond its design speed?
Why is a starter-generator unit considered beneficial for gas turbine engines?
Why is a starter-generator unit considered beneficial for gas turbine engines?
What is the function of the series winding in a starter-generator unit?
What is the function of the series winding in a starter-generator unit?
In a starter-generator unit, what happens after the engine has reached self-sustaining speed?
In a starter-generator unit, what happens after the engine has reached self-sustaining speed?
What role does the actuator piston play in a hydraulic starter system?
What role does the actuator piston play in a hydraulic starter system?
Why is an overrunning feature necessary in engine start systems?
Why is an overrunning feature necessary in engine start systems?
What prevents the engine from driving the starter beyond its design speed in a gas turbine engine equipped with a starter-generator system?
What prevents the engine from driving the starter beyond its design speed in a gas turbine engine equipped with a starter-generator system?
What happens when a gas turbine engine equipped with a starter-generator system reaches self-sustaining speed?
What happens when a gas turbine engine equipped with a starter-generator system reaches self-sustaining speed?
In what way does the series winding contribute to the starting process in a starter-generator unit for gas turbine engines?
In what way does the series winding contribute to the starting process in a starter-generator unit for gas turbine engines?
Why do pawls slip out of tapered slots in the engine drive gear when a gas turbine engine accelerates up to self-sustaining speed?
Why do pawls slip out of tapered slots in the engine drive gear when a gas turbine engine accelerates up to self-sustaining speed?
What is the purpose of turning the engine master switch to the on position in the starter-generator circuit?
What is the purpose of turning the engine master switch to the on position in the starter-generator circuit?
What happens once the battery and start switches are turned to the on and start positions in the starter-generator circuit?
What happens once the battery and start switches are turned to the on and start positions in the starter-generator circuit?
In a starter-generator unit, what does energizing the throttle relay initiate?
In a starter-generator unit, what does energizing the throttle relay initiate?
What role does the motor relay play in the starter-generator electrical circuit?
What role does the motor relay play in the starter-generator electrical circuit?
What is controlled by energizing the ignition relay in a starter-generator system?
What is controlled by energizing the ignition relay in a starter-generator system?
When does the B-4 relay open in a starter-generator unit's operation?
When does the B-4 relay open in a starter-generator unit's operation?
What is the primary purpose of the undercurrent controller in a starter-generator system?
What is the primary purpose of the undercurrent controller in a starter-generator system?
What is the function of the motor relay in the undercurrent controller of a starter-generator system?
What is the function of the motor relay in the undercurrent controller of a starter-generator system?
Why does the aircraft designer not allow for a self-contained start in a starter-generator system configuration?
Why does the aircraft designer not allow for a self-contained start in a starter-generator system configuration?
What is the role of the undercurrent relay in a starter-generator system?
What is the role of the undercurrent relay in a starter-generator system?
Why is it preferable to use external electrical power instead of an aircraft battery for engine starts in some configurations?
Why is it preferable to use external electrical power instead of an aircraft battery for engine starts in some configurations?
What is the main function of the starter-generator controller in a typical starter-generator system?
What is the main function of the starter-generator controller in a typical starter-generator system?
What is the primary role of the regulator piston in the pneumatic starter system described?
What is the primary role of the regulator piston in the pneumatic starter system described?
Why is the relief valve incorporated in the pneumatic starter system?
Why is the relief valve incorporated in the pneumatic starter system?
What initiates the resetting of the pilot valve in the pneumatic starter system?
What initiates the resetting of the pilot valve in the pneumatic starter system?
In the pneumatic starter system, what role does the solenoid spring play when the engine rotates at 57-64% RPM?
In the pneumatic starter system, what role does the solenoid spring play when the engine rotates at 57-64% RPM?
Which component ensures that at a certain engine rotational speed, the actuator closes the butterfly in the pneumatic starter system?
Which component ensures that at a certain engine rotational speed, the actuator closes the butterfly in the pneumatic starter system?
What is the primary function of the butterfly valve in the pneumatic starter system?
What is the primary function of the butterfly valve in the pneumatic starter system?
What is the purpose of the start air solenoid in the pneumatic starter system?
What is the purpose of the start air solenoid in the pneumatic starter system?
In the pneumatic starter system, what role does the holding coil play once the start button is pressed?
In the pneumatic starter system, what role does the holding coil play once the start button is pressed?
Why does the pilot release the start button after the holding coil activates in the pneumatic starter system?
Why does the pilot release the start button after the holding coil activates in the pneumatic starter system?
What component is electrically completed to the starter control valve solenoid in the pneumatic starter system?
What component is electrically completed to the starter control valve solenoid in the pneumatic starter system?
After pressing the start button in the pneumatic starter system, what initiates the opening of the pilot valve?
After pressing the start button in the pneumatic starter system, what initiates the opening of the pilot valve?
What happens when an electrical signal is sent to the start air solenoid in the pneumatic starter system?
What happens when an electrical signal is sent to the start air solenoid in the pneumatic starter system?
What is the purpose of the poppet valve set at 2 PSI in the pneumatic starter system?
What is the purpose of the poppet valve set at 2 PSI in the pneumatic starter system?
How does the multiple disc clutch in the pneumatic starter system protect the engine accessory gear train?
How does the multiple disc clutch in the pneumatic starter system protect the engine accessory gear train?
In the pneumatic starter system, what role does the tube that collects air from the turbine play?
In the pneumatic starter system, what role does the tube that collects air from the turbine play?
Why is a portion of air directed to the starter gearbox in the pneumatic starter system?
Why is a portion of air directed to the starter gearbox in the pneumatic starter system?
What does the reduction gearing do in a pneumatic starter system?
What does the reduction gearing do in a pneumatic starter system?
What is the function of the clutch located between the starter coupling and reduction gearing in a pneumatic starter system?
What is the function of the clutch located between the starter coupling and reduction gearing in a pneumatic starter system?
What function does the solenoid spring perform when the engine rotates at 57-64% RPM in a pneumatic starter system?
What function does the solenoid spring perform when the engine rotates at 57-64% RPM in a pneumatic starter system?
What is the primary purpose of the regulator piston in a pneumatic starter system?
What is the primary purpose of the regulator piston in a pneumatic starter system?
How does an air impingement starter system differ from other pneumatic starters for gas turbine engines?
How does an air impingement starter system differ from other pneumatic starters for gas turbine engines?
What does the operation of the control (throttle) lever do during the start of a gas turbine engine?
What does the operation of the control (throttle) lever do during the start of a gas turbine engine?
In a turbo-propeller engine, how is the throttle lever interconnected with the propeller control unit?
In a turbo-propeller engine, how is the throttle lever interconnected with the propeller control unit?
What function does the power lever serve in an aircraft's powerplant controls?
What function does the power lever serve in an aircraft's powerplant controls?
What is the role of the speed lever in an aircraft's powerplant controls?
What is the role of the speed lever in an aircraft's powerplant controls?
How is the output from the power and speed levers transferred to the powerplant in an aircraft?
How is the output from the power and speed levers transferred to the powerplant in an aircraft?
What initiates the rotation of the engine in air impingement starting?
What initiates the rotation of the engine in air impingement starting?
How is self-sustaining speed achieved in gas turbine engines using air impingement starting?
How is self-sustaining speed achieved in gas turbine engines using air impingement starting?
What is the purpose of the shut-off valve in air impingement starting?
What is the purpose of the shut-off valve in air impingement starting?
Why might some gas turbine engines not be fitted with starter motors?
Why might some gas turbine engines not be fitted with starter motors?
What role do non-return valves play in air impingement starting?
What role do non-return valves play in air impingement starting?
When does the speed switch close in air impingement starting?
When does the speed switch close in air impingement starting?
What is the purpose of the actuator piston in the air impingement starter system?
What is the purpose of the actuator piston in the air impingement starter system?
What role does the starter speed sensing switch play when the engine rotates at 57-64% RPM in the air impingement starter system?
What role does the starter speed sensing switch play when the engine rotates at 57-64% RPM in the air impingement starter system?
What prevents damage from excessive air pressure in the air impingement starter system?
What prevents damage from excessive air pressure in the air impingement starter system?
What allows external air sources to provide airflow in the air impingement starter system?
What allows external air sources to provide airflow in the air impingement starter system?
In the air impingement starter system, what initiates the closure of the butterfly when the engine reaches 57-64% RPM?
In the air impingement starter system, what initiates the closure of the butterfly when the engine reaches 57-64% RPM?
What converts airflow into torque in the air impingement starter system?
What converts airflow into torque in the air impingement starter system?
What happens when the engine self-sustaining RPM is established in the Allison T56 engine start sequence?
What happens when the engine self-sustaining RPM is established in the Allison T56 engine start sequence?
At what percentage of RPM does the engine stabilize within a low-speed ground idle range in the Allison T56 engine start sequence?
At what percentage of RPM does the engine stabilize within a low-speed ground idle range in the Allison T56 engine start sequence?
What action is taken when the high-pressure fuel shut-off cock is activated open in the Allison T56 engine start sequence?
What action is taken when the high-pressure fuel shut-off cock is activated open in the Allison T56 engine start sequence?
What is the final stage in the Allison T56 engine start sequence?
What is the final stage in the Allison T56 engine start sequence?
At approximately what percentage of RPM does the ignition system get deactivated in the Allison T56 engine start sequence?
At approximately what percentage of RPM does the ignition system get deactivated in the Allison T56 engine start sequence?
During what phase of the Allison T56 engine start sequence does combustion begin?
During what phase of the Allison T56 engine start sequence does combustion begin?
Why is it important to control the starting and ignition sequences of a gas turbine engine?
Why is it important to control the starting and ignition sequences of a gas turbine engine?
Why does ignition in a gas turbine engine only begin after the engine is capable of meeting certain airflow requirements?
Why does ignition in a gas turbine engine only begin after the engine is capable of meeting certain airflow requirements?
What is a potential consequence of not effectively sequencing ignition and fuel flow during engine starting?
What is a potential consequence of not effectively sequencing ignition and fuel flow during engine starting?
Why is it necessary for the pilot to manually place the throttle into the idle position following switch selection in certain engine configurations?
Why is it necessary for the pilot to manually place the throttle into the idle position following switch selection in certain engine configurations?
What can happen if the fuel flow rate during initial engine cranking is not sufficient for combustion?
What can happen if the fuel flow rate during initial engine cranking is not sufficient for combustion?
Why is it critical to ensure that there is sufficient airflow through the engine at the time of ignition?
Why is it critical to ensure that there is sufficient airflow through the engine at the time of ignition?
What is the purpose of a shut-off cock in the fuel system of an aircraft engine?
What is the purpose of a shut-off cock in the fuel system of an aircraft engine?
How is the high-pressure shut-off cock in the fuel control unit typically operated?
How is the high-pressure shut-off cock in the fuel control unit typically operated?
When must fuel flow commencement and ignition selection be carefully sequenced during engine start?
When must fuel flow commencement and ignition selection be carefully sequenced during engine start?
What controls the operation of a high-pressure cock that is electrically actuated in an aircraft engine?
What controls the operation of a high-pressure cock that is electrically actuated in an aircraft engine?
In some configurations, what happens automatically once a predetermined engine RPM is reached during starting?
In some configurations, what happens automatically once a predetermined engine RPM is reached during starting?
