ATA 46 Information Systems

Question 1

Where is the ATSU located?

Answer 1

80VU

Question 2

What is scan mask?

Answer 2

A prioritised list of VHF service providers contracted by the airline

Question 3

What are the indications of an ATSU failure?

Answer 3

• Message ‘DATALINK ATSU FAULT’ appears on the EWD
• Master caution light and single chime activate
• ATSU appears on the INOP SYS page

Question 4

When is the DATALINK ATSU FAULT warning message inhibited?

Answer 4

During flight phases 3, 4, 5, 7 and 8

Question 5

What are the four essential parameters to allow initialisation of the ATSU?

Answer 5

• Aircraft ICAO code
• Valid airline identification
• Valid aircraft registration number
• Valid scan mask

Question 6

Where does the ATSU receive aircraft registration and flight identification?

Answer 6

Aircraft registration - CFDIU

Flight identification - Concatenating the airline identification parameter and the flight number parameter coming from the FMGC

Question 7

What parameters are included in the extended squitter of ADS-B?

Answer 7

• Altitude
• Longitude
• Latitude
• Movement
• Ground track
• Flight number
• E/W velocity
• N/S velocity
• Vertical rate

Question 8

How does ADS-C differ from ADS-B?

Answer 8

ADS-C uses the almost worldwide datalink range and can track aircraft out of SSR coverage

Reports data requested in a contract between the airborne system and the ATC ground system

Is an end-to-end application