Loss of the ADIRS CDU Data Input on the ADIRU3

TASK 34-14-00-810-931-A
Loss of the ADIRS CDU Data Input on the ADIRU3

1. Possible Causes

CDU-ADIRS [2FP]
ADIRU-3 [1FP3]
wiring of the CDU OUTPUT bus from the ADIRS CDU (2FP) to the ADIRU3 (1FP3)
wiring of the CDU DSPL SELECT discrete from the ADIRS CDU (2FP) to the ADIRU3 (1FP3)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-12-12-000-001	Removal of the ADIRS CDU
AMM 34-12-12-400-001	Installation of the ADIRS CDU
AMM 34-12-34-000-001	Removal of the ADIRU
AMM 34-12-34-400-001	Installation of the ADIRU
AMM 34-14-00-740-001	Interface Test of the IR
ASM 341402

3. Fault Confirmation
Subtask 34-14-00-740-267-A

A. Test
(1) Do the Interface test of the IR (system 3) AMM 34-14-00-740-001.

4. Fault Isolation
Subtask 34-14-00-810-185-A ** ON A/C NOT FOR ALL

A. If the BITE test gives the maintenance message ADIRS CTLPNL (2FP):

(1) If the fault continues:

(a) If the fault continues:

do a check of the wiring of the CDU OUTPUT bus from the ADIRS CDU (2FP) to the ADIRU3 (1FP3) ASM 341402.

1 If there is no continuity:

2 If there is continuity:

do a check and repair the wiring of the CDU DSPL SELECT discrete from the ADIRS CDU (2FP) to the ADIRU3 (1FP3) ASM 341402.

Subtask 34-14-00-740-268-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:50 UTC