MESA AIRLINES E-JET SYSTEMS
STUDY QUESTIONS 2024.2025 |
COMPLETE!!
How many networks make up the electrical system on the airplane?
Why? - ACCURATE ANSWERS✔✔ 2 independent networks
Redundancy and fault isolation
What happens if a power generating source fails? - ACCURATE
ANSWERS✔✔ Bus ties automatically connect to provide no system
degradation
What components power the AC system? - ACCURATE ANSWERS✔✔
2 Integrated Drive Generators (IDG)
Auxiliary Power Unit (APU)
Inverter
Ram Air Turbine (RAT)
AC GPU receptacle
What components power the DC system? - ACCURATE
ANSWERS✔✔ 2 NiCad batteries
3 Transformer Rectifier Units (TRU)
DC GPU receptacle
,How does the IDG maintain a stable power output? - ACCURATE
ANSWERS✔✔ A Constant Speed Drive (CSD) attaches the IDG to the
AGB (Accessory Gear Box)
What monitors and controls the IDG's? - ACCURATE ANSWERS✔✔
Each has a Generator Control Unit (GCU)
Can one IDG supply the entire electrical system? - ACCURATE
ANSWERS✔✔ Yes
What will cause the amber IDG light on the overhead panel to
illuminate? - ACCURATE ANSWERS✔✔ High oil temperature
Low oil pressure
If an IDG is manually disconnected can it be reconnected by the flight
crew? - ACCURATE ANSWERS✔✔ No. This is a maintenance
function
What is the primary purpose the AC generators? - ACCURATE
ANSWERS✔✔ To power the AC BUSES and AC ESS BUS which...
Power the 3 Transformer Rectifier Units (TRU) 1, 2, and AC STBY
BUS
What is the purpose of the Transformer Rectifier Units? - ACCURATE
ANSWERS✔✔ To convert 115 VAC to 28 VDC
,Can the APU replace a failed IDG? - ACCURATE ANSWERS✔✔ Yes
What is the AC electrical system's priority? - ACCURATE
ANSWERS✔✔ Onside (IDG)
Inside (APU)
Outside (GPU)
Cross-Side (Other IDG)
How is it known that an AC GPU is hooked up to the airplane and ready
to provide electricity? - ACCURATE ANSWERS✔✔ GPU button
displays AVAIL and the GPU icon is presented on the electrical synoptic
page
Once the GPU button is pushed in, the button will display IN USE
provided another AC power source is not available.
What does it mean if the AC GPU is plugged in and the outside GPU
panel button displays IN USE? - ACCURATE ANSWERS✔✔ Ground
service bus is in use
Cockpit GPU button will display AVAIL even though the ground service
bus is in use
If the airplane is using the AC GPU and the APU is started what should
the pilot be sure to do? - ACCURATE ANSWERS✔✔ Deselect the
GPU button before the next GPU connection
, What will charge the batteries? - ACCURATE ANSWERS✔✔ Any AC
Power Source
How long will the aircraft's batteries last with no recharging? -
ACCURATE ANSWERS✔✔ 10 minutes
What is the purpose of the DC GPU receptacle? - ACCURATE
ANSWERS✔✔ For APU start when batteries < 22.0 VDC, or
If battery temp is < -20°C
What is the minimum battery temp for APU start? - ACCURATE
ANSWERS✔✔ -20°C
What is the minimum battery voltage to close the battery bus-ties? -
ACCURATE ANSWERS✔✔ 18 volts
What battery is used for the APU start? - ACCURATE ANSWERS✔✔
BATT 2 powers the APU Start Bus
BATT 1 powers the FADEC & EICAS for monitoring
What is the purpose of the Inverter? - ACCURATE ANSWERS✔✔
Converts 28 VDC from the batteries to 115 VAC to power the AC
STANDBY BUS when an AC source is not available
What is on the AC STANDBY BUS? - ACCURATE ANSWERS✔✔
Engine exciters 1A and 2A
STUDY QUESTIONS 2024.2025 |
COMPLETE!!
How many networks make up the electrical system on the airplane?
Why? - ACCURATE ANSWERS✔✔ 2 independent networks
Redundancy and fault isolation
What happens if a power generating source fails? - ACCURATE
ANSWERS✔✔ Bus ties automatically connect to provide no system
degradation
What components power the AC system? - ACCURATE ANSWERS✔✔
2 Integrated Drive Generators (IDG)
Auxiliary Power Unit (APU)
Inverter
Ram Air Turbine (RAT)
AC GPU receptacle
What components power the DC system? - ACCURATE
ANSWERS✔✔ 2 NiCad batteries
3 Transformer Rectifier Units (TRU)
DC GPU receptacle
,How does the IDG maintain a stable power output? - ACCURATE
ANSWERS✔✔ A Constant Speed Drive (CSD) attaches the IDG to the
AGB (Accessory Gear Box)
What monitors and controls the IDG's? - ACCURATE ANSWERS✔✔
Each has a Generator Control Unit (GCU)
Can one IDG supply the entire electrical system? - ACCURATE
ANSWERS✔✔ Yes
What will cause the amber IDG light on the overhead panel to
illuminate? - ACCURATE ANSWERS✔✔ High oil temperature
Low oil pressure
If an IDG is manually disconnected can it be reconnected by the flight
crew? - ACCURATE ANSWERS✔✔ No. This is a maintenance
function
What is the primary purpose the AC generators? - ACCURATE
ANSWERS✔✔ To power the AC BUSES and AC ESS BUS which...
Power the 3 Transformer Rectifier Units (TRU) 1, 2, and AC STBY
BUS
What is the purpose of the Transformer Rectifier Units? - ACCURATE
ANSWERS✔✔ To convert 115 VAC to 28 VDC
,Can the APU replace a failed IDG? - ACCURATE ANSWERS✔✔ Yes
What is the AC electrical system's priority? - ACCURATE
ANSWERS✔✔ Onside (IDG)
Inside (APU)
Outside (GPU)
Cross-Side (Other IDG)
How is it known that an AC GPU is hooked up to the airplane and ready
to provide electricity? - ACCURATE ANSWERS✔✔ GPU button
displays AVAIL and the GPU icon is presented on the electrical synoptic
page
Once the GPU button is pushed in, the button will display IN USE
provided another AC power source is not available.
What does it mean if the AC GPU is plugged in and the outside GPU
panel button displays IN USE? - ACCURATE ANSWERS✔✔ Ground
service bus is in use
Cockpit GPU button will display AVAIL even though the ground service
bus is in use
If the airplane is using the AC GPU and the APU is started what should
the pilot be sure to do? - ACCURATE ANSWERS✔✔ Deselect the
GPU button before the next GPU connection
, What will charge the batteries? - ACCURATE ANSWERS✔✔ Any AC
Power Source
How long will the aircraft's batteries last with no recharging? -
ACCURATE ANSWERS✔✔ 10 minutes
What is the purpose of the DC GPU receptacle? - ACCURATE
ANSWERS✔✔ For APU start when batteries < 22.0 VDC, or
If battery temp is < -20°C
What is the minimum battery temp for APU start? - ACCURATE
ANSWERS✔✔ -20°C
What is the minimum battery voltage to close the battery bus-ties? -
ACCURATE ANSWERS✔✔ 18 volts
What battery is used for the APU start? - ACCURATE ANSWERS✔✔
BATT 2 powers the APU Start Bus
BATT 1 powers the FADEC & EICAS for monitoring
What is the purpose of the Inverter? - ACCURATE ANSWERS✔✔
Converts 28 VDC from the batteries to 115 VAC to power the AC
STANDBY BUS when an AC source is not available
What is on the AC STANDBY BUS? - ACCURATE ANSWERS✔✔
Engine exciters 1A and 2A
