Avionics

Question 1

How is the information transferred?

Answer 1

Between avionics components information is transferred using multiplex data buses

Question 2

Aircraft data bus system

Answer 2

Mil std 1553 B
ARINC 429

Question 3

1553B

Answer 3

A+ B channel
Either can assume control

Question 4

BC

Answer 4

Bus controller
Embedded computer on each bus
Performs diagnostic checks and message traffic on the bus

BBC

Question 5

Which systems have BC and BCC?

Answer 5

Mission Buses
Communication buses
WACS bus

Four flight control bus has its own redundancy

Question 6

Bus contention

Answer 6

BC and BBC both actively controlling bus traffic - may result in wap message . Components may shut down until sorted

Question 7

RT?

Answer 7

Remote terminal

Forms comms link between avionics component and bus

Every component on 1553 has either a BC or a RT

Question 8

Comms Buses

Answer 8

No.1&2 handle control signals of the comms components

If both buses fail

Only Com1 VHF/UHF works

Question 9

Mission buses

Answer 9

Connect Mission system (mission computers) to mission components

Most of the components have one bus connection

The AFCS has inputs from mission bus 1 + 2

If both mission buses fail or both mission computers fail the MFD’s and HUDs are disabled

Question 10

WACS

Answer 10

Single bus
Warning caution computers are used as the back up for the WACs

Question 11

ARNIC 429

Answer 11

Used predominately for Eng stuff

Question 12

MCK

Answer 12

Mission computer/ communication keyboard . Allows the transfer between the ARNIC and 1553B