EIS- Electric Instrument System

Question 1

ADIRS & FMGS supply 3 DMCs. What does each DMC supply?

Answer 1

DMC 1- Captain EFIS and ECAM
DMC 2- FO EFIS
DMC 3- Backup

Question 2

How many channels per DMC?

Answer 2

One channel which can simultaneously provide management of EFIS & ECAM.

Question 3

Where is sensor data supplied to and then where is it sent?

Answer 3

Supplied to 2 SDACs, which process data and send some of it as system data to the 3 DMCs.

Also sent to FWCs for warnings/alerts.

Question 4

What is the purpose of data sent from SDACs to FWCs?
And from system sensors?

Answer 4

SDACs- To generate most of amber cautions.

System sensors- to generate red warnings, and remaining amber cautions.

Question 5

What do the FWCs supply?

Answer 5

-DMCs for display of alert messages.
-attention getters.
-loudspeakers for aural alerts.

Question 6

How is each ADIRU split?

Answer 6

ADR- receives information from the pitot/static system.

IR- responsible for determining aircraft’s present position and attitude.

Question 7

Where does each ADR receive information from?

Answer 7

ADIRU 1- captains AOA probe, TAT probe pitot tube and static ports.

ADIRU 2- FOs probes/ports.

ADIRU 3- standby AOA, CAs TAT, standby pitot tube and static ports.

Question 8

Where does IRU portion of ADIRU receive information from?

Answer 8

Three ring laser gyros (one each for roll, pitch and yaw)- 9 for aircraft.
These detect changes in orientation and spin.

Also from accelerometers (one each for roll, pitch and yaw)- 9 for aircraft. These measure changes in acceleration and gravity-induced forces.

Question 9

Under normal operations, which DMCs supply which DUs?

Answer 9

-DMC 1 supplies CA PFD and ND, and both ECAM DUs.

-DMC 2 supplies FO PFD and ND.

-DMC 3 is backup and can supply any DU.

Question 10

2 SDACs (System Data Aquisition concentrators) gather information from aircraft sensors and transmit data to DMCs. What is the data used to generate?

Answer 10

-System display pages
-Engine operating parameters

SDACs also trigger FWCs to generate level 2 cautions.

Question 11

What is data sent to FWCs from SDACs used for?

Answer 11

-warnings (red) and cautions (amber)
-aural alerts (loudspeakers)
-MASTER WARN and MASTER CAUT

Question 12

Which ILS receivers supply which DUs?

Answer 12

ILS 1 provides information to CA’s PFD and FO’s ND.

ILS 2 provides information to FO’s PFD and CA’s ND.

Question 13

Where are indications supplied from for ISIS? (Integrated standby instrument system)

Answer 13

-attitude info from ADIRU 1 & 3 as well as it’s own internal gyro.

-airspeed/altitude info supplied from the standby pitot static system.

-localiser/glideslope info from ILS 1.

Question 14

Where does information come from for backup display DDRMI? (Digital distance and RMI)

Answer 14

Captains ADIRU.

Question 15

What does an amber box surrounding digital VSI signify?

Answer 15

IRU vertical speed is unavailable, and ADR is providing a backup barometric signal.

Question 16

What conditions is DFDR (flight recorder) automatically energised? (4 items)

Answer 16

1. For 5 minutes after applying power on the ground.
2. On the ground with an engine running.
3. Continuously when airborne.
4. For 5 minutes after the second engine is shutdown.

Question 17

When are TO and LDG INHIBIT displayed?

Answer 17

Takeoff- 80kts to 1500AGL
Landing- 800AGL to 80kts

The following failures are not inhibited:
-engine/APU fires.
-engine failures/LO OIL pressure.
-L+R elevator fault.
-FWC 1+2 fault.
-takeoff config warnings (takeoff only).

Question 18

What do the IR units provide?
(FAT HAAG)

Answer 18

-Flight path vector
-Airplane position
-Track

-Heading
-Attitude
-Acceleration
-Ground speed

Question 19

What do the ADR units provide?
(BOATS)

Answer 19

-Barometric altitude
-Overspeed warnings
-AOA
-Temperatures
-Speed/mach

Question 20

What does a flashing IR FAULT light mean?

Answer 20

It is possible that attitude and heading information may be recovered in ATT mode.

Question 21

What does a flashing IR ALIGN light mean? (3 possibilities)

Answer 21

-IR alignment fault

-no PPOS detected after 10 mins

-difference between shutdown location and entered position exceeds 1 deg of lat/long

Question 22

What are the post flight accuracy checks for ADIRUs in normal ops?

Answer 22

1) if position deviation is greater than 5 NM on any IRS, and/or

2) GS >= 15 kt on any IR when aircraft is stopped with TK/GS selected on ADIRS panel.

Question 23

What are the implications of a dual IR fault?

Answer 23

-reverts to Alternate Law
-speed limit becomes 320 kts
-landing distance increased 20 percent
-Landing will be in Direct Law with Flaps 3.

Question 24

When is speed brake extension inhibited?
(SAFE)

Answer 24

S - SEC 1 and 3 fault
A - AOA protection active
F - Flap configuration full
E - Elevator (L or R) fault (only spoilers 3 and 4 are inhibited)