Electrical Flashcards
Location of Main Battery
Nose compartment
Location of the APU Battery
Aft equipment bay
Max Engine Generator load
40 KVA
Max APU Generator load
40 KVA
Max Transformer rectifier unit (TRU) load
120 amps
Max permissible time for ground operations with battery power only
5 minutes
What is the reason for max permissible time for ground operations with battery power
To prevent ED1 and ED2 from overheating (fans are AC powered)
How many TRUs are installed
4
Where are the TRUs located
nose compartment
The Main Battery is rated to
17 ampere hour/24 volts
APU Battery is rated to
43 ampere hour/24 volts
How many generators are installed
four, 2 engine generators, 1 APU generator, 1 ADG
What is the function of the 4 TRUs
To convert 115 V AC to 28 V DC
How are the TRU’s cooled
Individual fans
Which buses are powered when the Battery Master switch is selected on
Main battery direct bus
APU battery direct bus
DC Battery bus
If the main buses are powered, are the essential buses automatically powered
Yes
Is there an on/off switch for the TRU’S
No, they are automatically powered when the AC busses are powered
What controls the DC tie contactors
The DC Power Centers (DCPC) automatically control DC tie operation
When will the Air Driven Generator (ADG) automatically deploy
With complete loss of A/C power
With the ADG deployed, what are the basic items that are powered
FlASH (Memory aid)
Flaps/Slats
AC Essential BUS
STAB trim CH2
Hydraulic Pump 3B
What is the ADG max load
15 KVA
What is on the accessory gearbox?
FISH Oil + Memory Aid
Fuel pump (engine driven high pressure)
Integrated drive generators
Starter (air turbine)
Hydraulic pumps (engine driven)
EDP’s Oil Pump
FADEC Alternator (+)
What is a TRU?
Transformer Recitifier Unit
Where is the external AC power receptacle located?
Lower right side forward nose area
What is the AC electrical system rated at?
115VAC 400Hz 3 Phase
What is the voltage of the DC electrical system?
28 VDC
What is an Integrated Drive Generator (IDG)?
An AC Generator combined with a constant speed drive.
The IDG converts variable N2 RPM to constant 12,000 RPM generator speed
How are TRU’s cooled?
Cooling fans located un the TRUs
When do TRUs come online?
The TRUs come online when the AC bussses are powered
If the main buses are powered, are the essential buses also powered?
Yes
When will the Air driven generator (ADG) automatically deploy?
With compete loss of A/C power
With the ADG deployed, what items are powered?
AC ESS Bus
Hydraulic pump 3B
Flaps/Slats
STAB Trim CH 2
What is the minimum airspeed to configure the aircraft for landing on ADG power?
140 Kts
