Electrical Bus Equipment

Question 1

MAIN HOT BATTERY BUS

Answer 1

• APU Fuel SOV,
• APU & Lwr Cargo Fire Extinguishers
• Spar Valves (All Engs)
• Engine Fire Extinguishers (All Engs),
• Fire Sw Unlock (All Engs)

Question 2

APU HOT BATTERY BUS

Answer 2

• IRU L, C, R DC Power
• L & R Outflow Valves
• APU Inlet Door
• APU Controller (primary)

Question 3

MAIN BATTERY BUS

Answer 3

• APU Controller (alternate),
• IDG Disconnect
• Trailing-Edge Flap Control
• Dome, Storm, & selected Interior Lights
• Fuel Valves (all Engines),
• All Crossfeed Valves
• Manual Pressurization Controller,
• CA’s Interphone,
• Left Radio Tuning Panel,
• Left VHF

Question 4

APU BATTERY BUS

Answer 4

• APU DC Fuel Pump
• APU & Engine Fire/Overheat Detection Loops A & B
• APU Fire Warning Horn
• Engine Start Air Control
• Cargo, FO’s & Service Interphones
• PA System

Question 5

MAIN STANDBY BUS

Answer 5

• STBY Ignition for all Engines
• EFIS Control
• L EIU, CDU, ILS, VOR, ADC, Xponder,
• Primary EICAS, RMI, STBY Instrument Lights
• Various Flight Control Components

Question 6

APU STANDBY BUS

Answer 6

• L PFD
• L ND
• L FMC

Question 7

CAPTAIN TRANSFER BUS

Answer 7

• C EFIS/EICAS (EIU)

* L HF

Question 8

FO TRANSFER BUS

Answer 8

• Autothrottle Servo
• EFIS Control
• R EIU, FMC, ND, PFD, ADC, CDU, HF
• Lower EICAS Display

Question 9

GROUND HANDLING BUS

Answer 9

• Lower Cargo Doors
• Lower Cargo Handling Equipment
• Lower Cargo Lights
• Fueling System
• Aux Hyd Pump 4

Question 10

GROUND SERVICE BUS

Answer 10

• Main & APU Battery Chargers
• Fuel Pumps for APU Start
• Flight Deck Flood, Navigation & Service Lights
• Misc Service Outlets & Equipment

Question 11

Main Deck Cargo Handling Bus

Answer 11

• Nose and Side Cargo Doors
• Main Deck Cargo Lights
• Main Deck Cargo Handling Equipment

Question 12

Main Busses AC Power

Answer 12

• TRU’s
• Navigation Radios
• Flight Control Computers
• Flight Deck Lighting
• Pitot and Windows Heat

Question 13

DC Bus Power

Answer 13

• Fuel Jettison
• Cabin Pressure
• Pack temperature Controllers
• Wing Anti-Ice Control
• Engine Driven and Hydraulic Demand Pump Control
• Fuel Transfer and Jettison Valve Control
• Individual Nacelle Anti-ice Control

Question 14

What items are on the utility bus

Answer 14

• Foward Main Fuel Pumps 2 & 3
• Forward Override/Jettison Pumps 2 & 3
• Center Override/Jettison Pump
• Galley Equipment