Term
| Which Bus does the APU automatically connect to when started on the ground? |
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Definition
If Primary External power is on the right AC bus or the Primary is on the right and secondary external on the left busses, or Primary on both busses-Left Main AC Bus
(Primary will then power the right AC bus)
If Secondary external power is on both busses-Both AC Buses
If no buses are powered-Both Main AC Busses
(FCOM Vol 2, Rev 2- 6.20.2) |
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Term
| When do the the backup generators come online? |
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Definition
The backup electrical system automatically powers one or both transfer busses when-only one main AC Generator (includes APU) is available power to one or both of the main AC busses is lost approach (APP) mode is selected for autoland(think GMA)
(FCOM Vol 2, Rev 2- 6.20.7) |
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Term
| What causes the Integrated Drive Generator to disconnect automatically? |
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Definition
High Drive oil temperature
(FCOM Vol 2, Rev 2- 6.20.2) |
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Term
| What is the priority sequence for powering the main AC bus (controlled via the bus ties)? |
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Definition
Respective IDG APU generator opposite engine driven generator
(ground power must be selected manually)
(FCOM Vol 2, Rev 2- 6.20.5) |
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Term
| What does the RAT shed first when airspeed slows? |
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Definition
Electrical loads before hydraulic.
(FCOM Vol 2, Rev 2- 6.20.14) |
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Term
| With the RAT as the only source of power, other than batteries, what is powered? |
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Definition
The C1 and C2 TRU's which power
Both Captain's flight instrument bus
First Officer's flight instrument bus Center flight control PSA
(FCOM Vol 2 Rev 2- 6.20.9) |
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Term
| With only the battery for standby power, what is powered? |
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Definition
Left and Center flight control Power Supply Assemblies (PSA's)
Hot Battery Bus
Standby inverter
Battery Bus
Captain's flight instrument Bus
(think LCP HSBC)
(FCOM Vol 2, Rev 2- 6.20.13-14) |
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Term
| How is the Ground Handling Bus powered? |
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Definition
The Ground Handling Bus can be powered by the primary external power or the APU Generator [external has priority].
(FCOM Vol 2, Rev 2- 6.20.5)
(citation needed for brackets) |
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Term
| What does the Ground Handling Bus power? |
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Definition
Cargo handling
Fueling/defueling operations
other equipment (?)
Energized only during ground operations
(FCOM Vol 2, Rev 2- 6.20.5) |
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Term
| Why should we know the ground service bus exists? |
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Definition
It powers the Main and APU battery chargers.
(FCOM Vol 2, Rev 2- 6.20.5) |
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Term
| What is the ground service bus normal and alternate source of power? |
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Definition
Normal
Right Main AC Bus
Alternate
APU
External Power
(FCOM Vol 2, Rev 2- 6.20.5) |
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Term
| What is the AC Bus source priority sequence for powering the left and right main buses? |
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Definition
Respective IDG
APU generator
Opposite IDG
(external must be selected manually)
(FCOM Vol 2, Rev 2- 6.20.5) |
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Term
| How many frequency converters are there to make sure backup generator frequency and voltage are correct? |
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Definition
One
(FCOM Vol 2, Rev 2- 6.20.7) |
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Term
| How many backup generators can be on line at once? |
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Definition
One....because there is only one frequency converter available to make sure backup generator frequency and voltage are correct
(FCOM Vol 2, Rev 2- 6.20.7) |
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Term
| Can one backup generator power both transfer busses? |
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Definition
Yes
(FCOM Vol 2, ???Rev 2) |
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Term
| What happens when low oil pressure is detected in an IDG? |
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Definition
The DRIVE light illuminates
EICAS message ELEC GEN DRIVE L or R
(FCOM Vol 2- 6.20.2) |
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