Electrical Flashcards
What are the power sources for the AC buses during normal operating conditions
AC Buses 1 and 2
-Respective engine generator
-external power
-APU generator
AC ESS Bus
-Normally by AC bus 1
-AC bus 2 manually when AC ESS FEED pb is selected to ALTN
-AC bus 2 automatically
-
Describe the electrical systems power priority
Onside, outside, inside, cross side YAY the same
1- Respective engine generator
2- External power
3- APU Gen.
4- Opposite side gen
Recall the functions of the BUS TIE pd
AUTO (light out)- Power priority order logic is active
OFF-Power priority order logic is deactivated
-AC bus 1 and 2 can only be powered by their respective engine gen
-External or APU gen power cannot be applied to the aircraft
Recall the purpose of the AC ESS FEED pb
The AC ESS FEED pb is used to manually command AC bus w to power the AC ESS bus
When in the light out configuration
-AC bus 1 powers AC ESS bus. This is normal config
-Should AC bus 1 fail, AC bus 2 automatically powers AC ESS bus
When selected to ALTN
-AC bus 2 is commanded to power AC ESS bus regardless of the status of AC bus 1
-ALTN appears only when the pb is selected
Explain the information provide by the electrical power legends on the ECAM ELEC page
GEN 1 and GEN 2 and APU GEN
-Percent of output
-Voltage
-Frequency
EXT PWR
-Voltage
-frequency
NOTE the EXT PWR legend appears whenever the external power cord is connected to the aircraft and Volts and Freqs meet requirements
Recall the display on the ECAM ELEC page of an unpowered AC or DC ESS SHED Bus
The word SHED (amber) appears under AC ESS or DC ESS busses only when the respective SHED bus has automatically shed
Explain the meaning of GALLEY SHED display on the ECAM ELEC page
Inflight
when on single generator power, GALLEY SHED indicates that the galleys main bus has been automatically depowered. However its secondary bus remains powered
On Ground
With either external ir APU generator power is in use, both main and secondary galley busses remain powered
When the GALLEY pb is selected OFF, GALLEY SHED indicates the galleys main and secondary busses are depowered
Recall the cautions associated with selecting the guarded IDG1 and IDG2 pbs
to avoid damage to the IDG disconnect mechanism DO NOT:
-disconnect unless the engine is operating or is wind-milling
- hold the pb(s) for more than 3 seconds
Explain the color coding convention of the circuit breakers
GREEN
-Circuit breaker is monitored by the FWCs
-C/B TRIPPED messages appears on the ECAM when CB is open for more than 1 minute
Explain the color coding convention of the circuit breakers
BLACK
-circuit breaker is not monitored by FWCs therefore, no C/B TRIPPED message is generated
-the system which the circuit breaker supports may be monitored by the FWCS
Explain the color coding convention of the circuit breakers
YELLOW
pulled when flying on batteries only
Explain the color coding convention of the circuit breakers
RED
-the red cap around the circuit breaker prevents it from being reset
-provide circuit protection to the wing tip brakes (WTB)
Recall how gen 1 is affected when the GEN 1 LINE pb is selected OFF
-Opens gen 1 line contractor, in affect isolating it from the remainder of the aircrafts electrical system
-Gen 1 is limited to only powering one fuel pump is each wing tank
Describe the 2 methods of activating the emergency generator
Automatically
Loss of power to AC bus 1 and 2 in flight will automatically deploy the RAT and activate the emergency gen
Manually
-Selecting the red guarded MAN ON pb on the EMER ELEC PWR panel will manually deploy the RAT and activate the emergency gen
NOTE Selecting the RAT MAN ON pb on the HYD panel will deploy the RAT but WILL NOT active the emergency generator.
Explain the configuration called “Emergency Generation After Loss of All Main Generators”
It means the AC buses 1 and 2 are unpowered and the emergency gen is powering:
-AC ESS Bus
-DC ESS Bus through the ESS TR
-AC and DC ESS SHED buses through their ESS buses
NOTE the ECAM message for this configuration appears as ELEC EMER CONFIG
