Fault Message:

IAC/HUDC CONS FAULT

Fault Code:

3430021HUD

Associated CAS:

HUD MISCOMPARE
(Caution)

Head-Up-Display System (HUD) does not receive data from the Integrated Avionics Computer (IAC).

• Head-Up Flight Display Computer (HFDC) (A250)
• Integrated Avionics Computer (IAC) 1 (A11)
• Integrated Avionics Computer (IAC) 2 (A10)
• Integrated Avionics Computer (IAC) 3 (A12)
• Associated Wiring

Advisory Wire/Service Bulletin:

• AW700-45-0065 - CAIMS Nuisance Fault Messages

Forum Articles/Infoservice/Newsletter: None

If more fault reports are sent by a different system about the same IAC, do the CAIMS Test of the Integrated Avionics Computer (IAC) System.

1. Perform wiring checks between IAC 1 and HUDC as follow:

   From	To	Result
   A11DP1-18	A250BP1-C1
   A11DP1-19	A250BP1-D1
   GND	A250BP1- C2
   A11DP1-SH	A250BP1-SH

   1. If wiring checks are not good, repair defective wiring as required and do close out.
   2. If wiring checks are good, continue with next step.

2. Perform wiring checks between IAC 2 and HUDC as follow:

   From	To	Result
   A10DP1-18	A250EP1-G1
   A10DP1-19	A250EP1-G2
   GND	A250EP1-F2
   A10DP1-SH	A250EP1SH

   1. If wiring checks are not good, repair defective wiring as required and do close out.
   2. If wiring checks are good, continue with next step.

3. Perform wiring checks between IAC 3 and HUDC as follow:

   From	To	Result
   A12DP1-18	A250BP1-E7
   A12DP1-19	A250BP1-F7
   GND	A250BP1-B7
   A12DP1-SH	A250BP1-SH
   A12DP1-18	A250EP1-A4
   A12DP1-19	A250EP1-B4
   GND	A250EP1-A3
   A12DP1-SH	A250EP1-SH

   1. If wiring checks are not good, repair defective wiring as required and do close out.
   2. If wiring checks are good, continue with next step.

4. Replace defective IAC(s).

   1. If system checks are good, do close out.
   2. If fault remains, continue with next step.

5. Replace HUDC.
6. Do close out.