Flight Instruments

Question 1

What are the SDACs?

Answer 1

System Data Acquisition Concentrator (SDAC):

The two identical SDACs acquire data, then generate signals. Some of these signals go to the three DMCs, which use them to generate displays of system pages and engines parameters. Others go to the flight warning computers, which use them to generate ECAM messages and aural aural alerts.

Question 2

What are the FWCs?

Answer 2

Flight Warning Computer (FWC):

The two identical FWCs generate alert messages, memos, aural alerts, and synthetic voice messages. For this purpose they acquire data:
* Directly from aircraft sensors or systems to generate red warnings.
* Through the SDACs to generate amber cautions.

The ECAM display units display the alert messages generated by the FWCs. The FWCs also generate.
* Radio altitude callouts.
* Decision height callouts.
* Landing distance and landing speed increments.

Question 3

What indication would there be of a DMC failure?

Answer 3

INVALID DATA on the failed screens.

Question 4

If a DU fails, the Flight Crew may find one of the following displays:

Answer 4

• A blank screen with an “F” letter in amber
• A distorted display
• A blank screen with the INVALID DISPLAY UNIT message in amber

Question 5

Which ECAM control pbs are hardwired to the FWCs?

Answer 5

• Both CLRs
• STS
• RCL
• EMER CANC

Question 6

What occurs after pushing te EMER CANC pb?

Answer 6

• Warnings are cancelled but will reappear
• Cautions are cancelled for the remainder of the flight

Question 7

What occurs after pressing the STS pb?

Answer 7

If no abnormal conditions are present, “NORMAL” appears for 5 seconds

Question 8

The STATUS page automatically appears in abnormal operations if one of the following applies:

Answer 8

• The STATUS page is not empty, and the Flight Crew clears the last alert on the E/WD, or
• The STATUS page is not empty, and the Flight Crew selects the CONF1 for approach.