Term
| How many networks make up the electrical system on the airplane? Why? |
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Definition
2 independent networks
Redundancy and fault isolation |
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Term
| What happens if a power generating source fails? |
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Definition
Bus ties automatically connect to provide no system degradation.
NO BREAK POWER TRANSFER (NBPT) 14-05-10 |
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Term
| What components power the AC system? |
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Definition
•2 Integrated Drive Generators (IDG)
•Auxiliary Power Unit (APU)
•Inverter
•Ram Air Turbine (RAT)
•AC GPU receptacle |
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Term
| What components power the DC system? |
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Definition
•2 NiCad batteries
•3 Transformer Rectifier Units (TRU)
•DC GPU receptacle |
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Term
| How does the IDG maintain a stable power output? |
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Definition
| A Constant Speed Drive (CSD) attaches the IDG to the AGB (Accessory Gear Box) |
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Term
| What monitors and controls the IDG's? |
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Definition
| Each has a Generator Control Unit (GCU) |
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Term
| Can one IDG supply the entire electrical system? |
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Definition
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Term
| What will cause the amber IDG light on the overhead panel to illuminate? |
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Definition
•High oil temperature
•Low oil pressure |
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Term
| If an IDG is manually disconnected can it be reconnected by the flight crew? |
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Definition
| No. This is a maintenance function. |
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Term
| What is the primary purpose of the AC generators? |
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Definition
•To power the AC BUSSES and AC ESS BUS which…
•Power the 3 Transformer Rectifier Units (TRU) 1, 2, and ESS |
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Term
| What is the purpose of the Transformer Rectifier Units? |
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Definition
| To convert 115 VAC to 28 VDC |
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Term
Can the APU generator convert 115 VAC to 28 VDC?
Limitation? |
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Definition
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Term
| What is the AC electrical system‘s priority? |
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Definition
•Onside (IDG)
•Inside (APU)
•Outside (GPU)
•Cross-Side (Other IDG)
Note: The airplane uses an onboard AC power source before an external AC source |
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Term
| How is it known that an AC GPU is hooked up to the airplane and ready to provide electricity? |
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Definition
-GPU button displays AVAIL and the GPU icon is presented on the electrical synoptic page
-Once the GPU button is pressed in, the button will display IN USE provided another AC power source is not available. |
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Term
| What does it mean if the AC GPU is plugged in and the outside GPU panel button displays IN USE |
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Definition
-Ground service bus is in use
-Cockpit GPU button will display AVAIL even though the ground service bus is in use. |
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Term
| If the airplane is using the AC GPU and the APU is started, what should the pilot be sure to do? |
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Definition
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Term
| What will charge the batteries? |
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Definition
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Term
| How long will the aircraft's batteries last with no recharging? |
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Definition
|
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Term
| What is the purpose of the DC GPU receptacle? |
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Definition
-For APU start when batteries < 21 VDC, or
-If battery temp is < 20 Degrees Celsius |
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Term
| What is the minimum batter temp for APU start? |
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Definition
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Term
| What battery is used for APU start? |
|
Definition
BATT 2 powers the APU Start Bus
BATT 1 powers the FADEC & EICAS for monitoring. |
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Term
| What is the purpose of the Inverter? |
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Definition
| Converts 28 VDC from batteries to 115 VAC to power the AC STANDBY BUS when AC source is not available. |
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Term
| What is on the AC STANDBY BUS |
|
Definition
| Engine Exciters 1A and 2A |
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Term
| What powers the Ram Air Turbine (RAT)? |
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Definition
| Airflow turns the RAT propeller which spins the turbine inside. |
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Term
| When will the RAT deploy? |
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Definition
-Automatically if AC BUSSES are not powered
-Manually by pilot |
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Term
| How long after deployment before the RAT will supply power? |
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Definition
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Term
| Is there a total loss of power during the 8 second RAT deployment? |
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Definition
| No. Batteries supply power to the DC ESS BUSSES and AC STANDBY BUS. |
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Term
|
Definition
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Term
| What is powered when just the batteries are on |
|
Definition
Compass backlight
Master warning
Guidance panel
Captain's display control
DU 2 & 3
EISS
Clock
Captains Reversionary panel
MCDU 2
captain's CCD
COM1/NAV1
AC STANDBY BUS (Igniters 1A & 2A |
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Term
|
Definition
| 40 kVa, 115 VAC, 400 Hz, three-phase |
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Term
| Describe the APU Generator |
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Definition
| 40 kVa, 115 VAC, 400 Hz, three-phase |
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Term
|
Definition
| 15 kVa, 115 VAC, 400 Hz, three-phase |
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Term
| Does the APU share oil with the APU generator? |
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Definition
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Term
| Is there a flap limitation with the RAT deployed? Why? |
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Definition
| Yes, Flaps 3. Will work at half speed because of single-channel operation. To assure adequate speed for the RAT. |
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