4 - EC175 Integrated Avionics And Display System (IADS)

Question 1

Name of EC175 IADS?

Answer 1

Helionix

Question 2

Components of Helionix?

Answer 2

4 x Multifunction Displays (MFDs)
2 x Aircraft Management Computers (AMCs)
1 x Data Transfer Device (DTD)

Question 3

Functions of Helionix?

Answer 3

• Flight Management and Control
• Navigation Management
• Vehicle and Engine Management
• Mission Management
• Alerting Management
• Integrated Automatic Flying Control System (AFCS)
• Automatic Reconfiguration
• Maintenance Data Centralisation

Question 4

MFD Overview?

Answer 4

• 4 x screens
• Physically identical and interchangeable
• Also process information as part of the Helionix system
• Numbered (L-R): 1, 3, 4, 2
• On power-up, 1 & 2 display Flight Navigation Display (FND), 3 & 4 display VMS
• 3 & 4 are selectable by crew

Question 5

MFD Architecture?

Answer 5

• All 4 MFDs receive inputs from both AMCs and radio COM and NAV sensors
• All 4 MFDs exchange data with AMCs via ARINC 429
• AMCs compare data with each other via ARINC 429
• MFDs exchange data with NAV/COM/Mission sensors via digital, discrete and analogue signals
• Landing Gear Ancillary Unit (LGAU) sends grd/flt logic info to MFDs
• Maintenance Control Panel (MCP) located vertically, LHS of floor console, aft end.

Question 6

Describe MFD power architecture:

Answer 6

MFD1. MFD3. MFD4. MFD2.

      ESS1.                                                                         ESS2.                                ESS1.
                                                                                                                                  EMERG2.
      NO-SHED2.                     FLT SHED1.                     NO SHED1.                     
                                               SHED2.

• MFDs are dual-powered
• MFD2 is most resilient; MFD3 is least resilient

Question 7

What are the MFD Primary feeds regarding air data?

Answer 7

MFD1. MFD3. | MFD4. MFD2.
|
ATT1. ATT1. | ATT2. ATT2.
AIR1. AIR1. | AIR2. AIR2.
HDG1. HDG1. | HDG2. HDG2.
RA1. RA1. | RA2. RA2.
FMS2. FMS2. | FMS2. FMS2.

• If source fails, affected side shows reconfig’d status (actual in column, ‘should’ between)
• FMS usually synch’d so only FMS2 displayed.