Electric Flashcards
How many AC power source does aircraft has ?
- 2 Engine driven generator
- 1 APU
- Ground power unit
- 1 Emergency generator
- Battery through STATIC INVERTER
What is the priority sequence for electrical power ?
(GEAR.B)
-Gen driven by engine
-External power
-APU
-RAT (emer gen)
-Battery
What is the output of Engine driven generator ?
-90KVA
-115/200V
-400HZ
-3 phase
Which system control the output of engine driven generator ?
Two Generators Control Units (GCU)
What are the function of GCUs ?
Generators Control Units
-Control the frequency and voltage of generator output.
-Protect the network by controlling the associated generator line contactor.
What is the output of APU gen ?
Auxilirary power unit
the same as engine driven gen
What is the function of GPCU ?
Ground Power Control Unit
Protect the network by controlling the external power contactor
What is the function of GAPCU ?
Ground and Auxiliary Power Control Unit
-Regulate via APU ECB (Electronic Control Box), the frequency and voltage of APU gen
-Protect the network by controlling the external power contactor and APU gen line contactor
What is the output of Emergency Generator ?
-5KVA
-115/200V
-400Hz
-3 phase
Which system control and monitor emergency generator ?
GCUs
Generators Control Units
What is the function of Static Iverter ?
Transforms DC power from BAT 1 into AC, which then supply AC ESSENTIAL BUS
What is the output of Static Iverter ?
-1KVA
-115V
-400Hz
-1 phase
When does Static Iverter activate automatically ?
Only bat supply the a/c and:
-A/C speed > 50 kt, regardless of BAT 1 and 2 pb position
-A/C speed < 50kt, both BAT 1 and 2 pb on
What are the function of TRs ?
Trasform Rectifier
Convert AC into 200A of DC
How many TRs does system contain ?
Trasform Rectifier
- TR 1 and TR 2
- ESS TR
- TR entertainment
Which system does TR 1 and TR 2 power ?
Trasform Rectifier
DC 1 and DC 2 BUS bar
Which system does ESS TR power ?
DC ESS BUS (Source from EMER GEN)
Which system does TR entertainment power ?
Trasform Rectifier
DC Entertainment BUS
What is the function of DC Entertainment BUS ?
Power In-Flight Entertainment System (IFE)
What is the capacity of batteries ?
Each Bat has a capacity of 23 Ah (Amper Hour)
Which bus are BAT permanently connected to ?
HOT BUS
What are the function of BCLs ?
Battery Charge Limiter
Mornitors battery charging and controls its battery contactor
How many type of circuit breaker does a/c has ?
Two types
-Monitored (green)
-Non-monitored (black)
Which CBs should never be reset ?
Wing Tip Brake C/Bs, the one with red cab
What happen if a C/B remain pulled ?
Any additional tripped C/B on the same panel is not detected by ECAM.
What GALLEY SHED message mean ?
The main galley, the in-seat power supply and IFE are shed
In-Flight Entertainment System
When will GALLEY SHED message appear ?
When there is only one gen power the a/c (except on ground with APU or external power ON)
When will BAT connect to DC BAT BUS automatically ?
-APU starting
-Bat voltage < 26.5 (bat charging)
-Loss of AC BUS 1 and 2 when speed < 100kt
Can BAT be discharged completely when a/c on ground ?
No, an automatic cut off logic will prevent that
When will RAT deploy automatically ?
Lost AC 1 and AC 2 and speed > 100kt
How can RAT supply electric power ?
RAT powers the blue hydraulic system, which then drives the emergency generator by mean of hydraulic motor
What happen when there is only BAT power the system and speed < 50kt ?
AC ESS BUS is SHED, all the display units are lost
How long does it take for emergency gen coupling ?
8s (5s for RAT deploy, 3s for powering)
FAULT lt on BAT pb ?
BCL is failed. Accompany with ECAM alert, when charge current is outside limits
Battery Charge Limiter
What happen when FAULT lt of BAT pb illuminate, with ECAM alert ?
BAT contactor open automaticaly
What happen when maintaining IDG pb > 3s ?
Integrated drive generator
May damage the IDG disconnection mechanism
Intergrated drive generator
What are cautions when disconnect IDG ?
Integrated drive generator
- Do not hold IDG pb more than 3s
- Only disconnect when eng running or windmilling
Intergrated drive generator
Can IDG be reconnected in flight ?
Integrated drive generator
No, only on ground
FAULT lt on IDG pb ?
Integrated drive generator
- IDG oil outlet overheat
- IDG oil press is low (inhibit at low eng speed N2 < 14%)
When will IDG disconect automatically ?
Integrated drive generator
When temp reach 200℃
FAULT lt of GEN pb ?
- GCU trips it
- Opening of line contactor (except when pb is OFF)
FAULT lt of APU GEN pb ?
Opening of line contactor
When is FAULT lt of APU GEN pb inhibited ?
-APU speed is too low
-APU on but EXT PWR or ENG GEN takes over
What Elec configuration is a/c in when failed AC 1 and GEN 2
EMER CONFIG
FAULT lt of AC ESS FEED pb ?
AC ESS BUS is not powered
FAULT lt of GALLEY pb ?
When load of any generator is > 100% of rated output
When COMMERCIAL pb is OFF, what system is not powered ?
- Cabin and cargo lights
- Water and toilet system
- Drain mast ice protection
- Galley
- Passenger entertainment system
- Semi-automatic cargo loading
FAULT lt of EMER GEN pb ?
AC 1 and 2 are not powered
What happen when push EMER GEN TEST pb ?
-If AC NORMAL BUSES are supplied
● Then EMER GEN is driven if blue elec pump in running. AC ESS BUS and DC ESS BUS is connected to EMER GEN
● ECAM display ELEC page automaticaly (only on ground)
-If only BATs supply a/c
● The static inverter powers the AC ESS BUS
What happen when push GEN 1 LINE pb ?
GEN 1 disconnect and only powers one fuel pump on each wing tank
Gen 2 powers both AC BUS 1 and 2
Which cockpit lights is avail during an emer elec situation ?
-Right side dome light
-Main panel flood light (left two columns only)
-Standby compass light
Is this possible to connect the eng driven gen in parallel ?
NO
After an IDG is disconnected inflight, why do you get a GALLEY SHED indication ?
To remind that main galley is shed because there is only one gen running
Where is the ground power connector ?
Near the nosewheel on the right side of fuselage
How do you perform a BAT check ?
- Turn off both BAT
- Check BAT abv 25.5V (if not charge)
- Turn both BAT to AUTO
- Check amp decrease below 60 within 5s
What is the power source of FADEC ?
Full authority digital engine control
FADEC have their own alternator when N2 abv a set value. If alternator fail, FADEC are powered by main elec system
Full authority digital engine control
When will you charge BAT ?
When BAT voltage < 25.5V
How do you charge BAT ?
- Turn BAT to AUTO
- Use EXT PWR
- Charge in 20 min
- After 20 min turn BAT OFF
- Check abv 25.5
- Turn BAT to AUTO
What is the minimum BAT voltage for operation ?
25.5V
How is DC BAT BUS normally powered ?
Via DC BUS 1 through DC tie contactor
When is the BAT checked performed ?
During FLIGHT DECK PREPARATION
How long will each ADIRU stay on BAT power ?
- ADIRU 2&3 remain for 5min until GEN can be restored
- ADIRU 1 ( or ADIRU 3 if ATT HDG CAPT 3 is selected) remains until GEN restored or BAT fail
How is IDG cooled ?
Integrated drive generator
By fuel from HP fuel pump drawn in from the fuel manifold
What is the function of IDG ?
Integrated drive generator
Convert variable engine speed to constant speed for optimum generator operation
What is the function of BUS TIE in AUTO position ?
Allow BUS TIE CONTACTORS to open and close automatically to maitain power to both AC BUS 1&2
What is the function of GALLEY pb in AUTO position ?
Sheds main galley, in seat power and IFE when there is only one GEN running (except on ground with APU or EXT PWR ON )
ALTN lt on AC ESS FEED ?
AC ESS BUS is powered from AC BUS 2
What lights illuminate when DC ESS SHED BUS fails ?
- Floor proximity emergency escape path marking system
- Overhead emergency lighting
- EXT signs
What buses are powered by EMER GEN ?
-AC ESS and DC ESS
-AC ESS SHED and DC ESS SHED
When is it normal to see ENG GEN FAULT lt illuminate ?
Prior to engine start
When should the red FAULT lt on the RAT & EMER GEN pb be expected ?
During 8s of RAT deployment
When would you use GEN 1 LINE pb ?
SMOKE procedure
