INDICATING/RECORDING SYSTEMS

Question 1

How many Display Units (US)

Answer 1

Six:

2 x PFD
2 x ND

ECAM
1 x E/W Display
1x SD

Question 2

How many DMCs and their function

Answer 2

• 3 identical DMCs
• obtain data from the different sensors and computers, and send it to the display units
• Each DMC has a single DMC channel, and can simultaneously supply one PFD, one ND, and both ECAM display units

Question 3

Normal DMC operation

Answer 3

‐ DMC 1 drives the CAPT PFD, CAPT ND and the ECAM DUs
‐ DMC 2 drives the F/O PFD and F/O ND
‐ DMC 3 is on standby, ready to drive any DU

• If DMC 1 fails (or DMC 3, if “CAPT 3” was selected), DMC 2 automatically drives the ECAM*

Question 4

Main components of the Engine Instrument System

Answer 4

Electronic Flight Instrument System (EFIS):

- 2 Primary Flight Displays (PFDs) 
- 2 Navigation Displays (NDs)

Electronic Centralized Aircraft Monitor (ECAM):

- 1 Engine/Warning Display (E/WD)
- 1 System Display (SD) 

3 x Display Management Computers (DMCs)

2 x SYSTEM DATA ACQUISITION CONCENTRATOR (SDAC)

2 x Flight Warning Computers

Attention Getters (master warning and caution lights)

Question 5

How to recognize a ‘failed ‘ DU?

Answer 5

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

Question 6

Warning/Cation Levels and Priorities

Answer 6

level 3 warning has priority over a level 2 caution which has priority over a level 1 caution

Question 7

TYPES OF FAILURES

Answer 7

Independent: failure that affects an isolated system or item of equipment without degrading the performance of others

Primary: failure of a system or an item of equipment that costs the aircraft the use of other systems or items of equipment

Secondary: the loss of a system or an item of equipment resulting from a primary failure

Question 8

How are primary and secondary failures depicted on the ECAM?

Answer 8

• primary failures are shown with a boxed title
• secondary failure are identified with a star (*) in front
• In case of ELEC EMER CONFIG, the secondary failures are inhibited

Question 9

When are yaw bars displayed on the PFD?

Answer 9

yaw bar in green below 30 ft radio height, if a localizer signal is available:

‐ During takeoff (in RWY mode)
‐ Upon landing (in FLARE and ROLL OUT mode)

Question 10

When does the CVR automatically record?

Answer 10

‐ on the ground during the first 5 min after the aircraft electrical network is energized
‐ on the ground with one engine running
‐ in flight
- stops automatically 5 min after the last engine shutdown

• Only the last 2 h of recording are retained

Question 11

When is the DFDR automatically active?

Answer 11

The recording system is automatically active:

‐ On the ground, during the first five minutes after the aircraft electric network is energized
‐ On the ground, after the first engine start
‐ In flight (whether the engines are running or not)

• On the ground, the recording system stops automatically five minutes after the second engine shuts down.
• stores 25 hrs of data