Loss of the AIR DATA 1 Output Bus 4 by the CFDIU

TASK 31-32-00-810-900-A
Loss of the AIR DATA 1 Output Bus 4 by the CFDIU

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-32-00-869-002	Procedure for the Class 3 Fault Reading
ASM 313202
AMM 31-32-34-000-001	Removal of the CFDIU
AMM 31-32-34-400-001	Installation of the CFDIU

3. Fault Confirmation
Subtask 31-32-00-740-246-A

A. Test
On the CFDS MENU page, get access to the AVIONICS STATUS page AMM 31-32-00-869-002.

4. Fault Isolation
Subtask 31-32-00-810-150-A

A. If the test gives the maintenance message NO ADR1 DATA:

(1) If the fault continues:

do a check and repair the wiring from the CFDIU (1TW) pins AA/3B, 3C to the first terminal block ASM 313202.

Subtask 31-32-00-740-247-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:29:56 UTC