Term
| How many hours does the CVR record? |
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Definition
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Term
| How do you erase the CVR? |
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Definition
| Push ERASE with the Parking brake set |
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Term
| What is the first flight of the day check for the CVR? |
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Definition
| Press the TEST button and observe the light for 1 second. |
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Term
| When do the engine driven generators come online? |
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Definition
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Term
| What is the output of an engine driven generator? |
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Definition
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Term
| What does GPU AVAIL mean? |
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Definition
| GPU power is detected. Not necessarily acceptable power. |
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Term
| What is the output of the APU generator? |
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Definition
| 400 Amps; 28 Volts. (300 Amps above 30,000 ft) |
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Term
| What type of main batteries are installed ? |
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Definition
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Term
| What is the output of each main battery? |
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Definition
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Term
| How long will the main batteries last in an electrical emergency? |
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Definition
40 minutes.
Note: Can be increased to 45 minutes if you shut-off PITOT 3 heat |
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Term
| How many APU start attempts are assumed in the 40 minutes of main battery power? |
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Definition
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Term
| If a main battery temperature exceeds +70C will it drop offline? |
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Definition
| No, You will get an EICAS message. |
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Term
| What does the ESSENTIAL POWER button do? |
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Definition
| It forces the "electrical emergency" configuration. The main batteries are connected to the essential busses. |
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Term
| When would you press the ESSENTIAL POWER button? |
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Definition
When directed by a checklist.
Example: ELEC ESS TFR FAIL procedure |
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Term
| What is the definition of an electrical emergency? |
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Definition
| Loss of all 5 generators in flight. |
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Term
| What would the PFD, MFD and EICAS look like in an "electrical emergency?" |
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Definition
- PFDs and MFDs - dark
- EICAS and RMUs - lit.
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Term
| What is an "electric essential transfer failure" (ELEC ESS XFER FAIL)? |
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Definition
| The EDL failed to configure for an electrical emergency when required. The DC buses aren't isolated from the batteries and since it's an electrical emergency the batteries aren't being charged! |
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Term
| What would the PFDs, MFDs and EICAS look like during an "electric essential transfer fail" (ELEC ESS XFER FAIL)? |
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Definition
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Term
| What are the main purposes of the central DC bus? |
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Definition
| To connect the GPU and APU to the electrical system and to allow load sharing between the busses. |
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Term
| How many generators need to be online to automatically power the shed busses? |
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Definition
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Term
| How can you power the shed busses with less than 3 generators online on the ground? |
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Definition
| SHED BUSSES knob to OVRD. |
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Term
| Can you power the shed busses with less than 3 generators online while in flight? |
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Definition
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Term
| What happens if you turn BUS TIES knob to the OFF position? |
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Definition
| It opens the bus tie contactors regardless of any command from the electrical system logic. |
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Term
| What happens when the BUS TIES knob is in the AUTO position? |
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Definition
| The EDL controls the bus tie contactors. |
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Term
| What happens when the BUS TIES knob is in the OVRD position? |
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Definition
| The bus tie connectors close regardless of EDL unless one of the GCUs detects an over-current condition. |
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Term
| What is an "electric emergency abnormal"? |
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Definition
| The EDL configured for an electrical emergency when not required. The DC busses are isolated. Batteries supplying Central & Essential Busses and not being charged! |
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Term
| In the case of an "electrical emergency abnormal" can you reconnect the 3 networks? |
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Definition
| No. But you can start the APU to keep the batteries charging while they power the Central and Essential busses. |
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Term
| How is the AC inverter powered? |
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Definition
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Term
| What is the purpose of the back-up battery? |
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Definition
| It provides stabilized power to the GCUs. |
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Term
| When is the back-up battery connected to the electrical system? |
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Definition
- BATT 1 - AUTO; and
- BACKUP button - in.
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Term
| Can external power charge the back-up battery? |
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Definition
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Term
| How much power does the back-up battery provide? |
|
Definition
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Term
| Where is the back-up battery located? |
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Definition
| In the floor in front of the F/O. |
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Term
| Why do we deselect the back-up battery when "re-booting" the aircraft? |
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Definition
| The back-up battery powers the EDL (Electrical Distribution Logic). |
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Term
| When is the ground service bus powered? |
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Definition
- GPU Connected
- GPU button out
- BATT 1 & 2 knobs OFF
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Term
| If the Flight Attendant turns the emergency lights on from the F/A panel, can they be turned off from the cockpit? |
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Definition
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Term
| How long will the emergency light batteries last? |
|
Definition
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