Electrical Flashcards
Components of Electrical system (AC and DC)
AC:
- 2 x IDGs
- 1 x APU gen
- 1 x inverter
- 1 x Ram Air Turnine (RAT)
- 1 x AC external power
DC:
- 2 x Nicad Batteries
- 3 x TRUs
- 1 x DC external power
AVAIL light on GPU button
AC GPU is connected to the airplane and AC power quality requirements (voltage/amperage/frequency) are satisfied
Amber dashes on Electrical synoptic page
output is invalid or out of range
Output rating of IDGs and APU Gern
- 40 kVA
- 115 VAC
- 400 Hz
- 3 phase
When are IDGs automatically disconnected?
- manual disconnection is not performed, and
- the IDG oil temperature reaches 366°F (185.6°C)
Output rating of Ram Air Turning
15 kVA
115 VAC
400 Hz
3- phase
Speed required to ensure RAT supplies AC/DC ESS Buses
130 knts
How long for RAT deployment
8 secs
*Batts supply backup power to DC ESS and STANDBY AC during rat deployment
Output of TRUs
- 300 Amps
- primary source of DC power
- converts 115 VAC —> 28VDC
TRUs provide DC power to which busses?
TRU 1 —> DC BUS 1, DC ESS BUS 1, DC GND SVC BUS, HOT BATT BUS 1 and battery #1 charging
TRU 2 —> DC BUS 2, DC ESS BUS 2, HOT BATT BUS 2 and battery #2 charging
TRU ESS —> DC ESS BUS 3
Output of Nicad batteries
- 22.8 VDC
- 27 A
- can supply electrical loads for 10 mins without help from GPU
Components of electrical power distribution and control
- 4 x Integrated Control Center (ICCs):
- Left Integrated Control Center (LICC)
- Right Integrated Control Center (RICC)
- Emergency Integrated Control Center (EICC)
- Auxiliary Integrated Control Center (AICC)
- 2 x Secondary Power Distribution Assemblies (SPDAs)
Electrical Bus locations
LICC - AC BUS 1, AC GND SVC BUS, DC GND SVC BUS, DC BUS 1
RICC - AC BUS 2, DC BUS 2, DC ESS BUS 2
EICC - AC ESS BUS, STBY AC BUS, DC ESS BUS 1, DC ESS BUS 3, HOT BATT BUS 1
AICC - HOT BATT BUS 2, APU START BUS
Which buses power the SPDAs
SPDA 1 - DC BUS 1 , DC ESS BUS 1, DC ESS BUS 2, DC GND SVC BUS
SPDA 2 - DC BUS 2, DC ESS BUS 1, DC ESS BUS 2, DC GND SVC BUS
Which CBs can be monitored by the flight crew
- Thermal non remote CBs located in the cockpit
- Electronic remote CBs located inside the SPDAs