Temporary Loss of the Heading, Roll and Pitch Data between the ADIRU1 and the TCAS

TASK 34-43-00-810-866-A
Temporary Loss of the Heading, Roll and Pitch Data between the ADIRU1 and the TCAS

1. Possible Causes

CMPTR-TCAS [1SG]
ADIRU-1 [1FP1]
wiring of the ARINC bus from the TCAS computer (1SG) to the ADIRU1 (1FP1)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
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
AMM 34-43-00-740-001	BITE Test of the TCAS
ASM 344301
AMM 34-43-34-000-001	Removal of the TCAS Computer
AMM 34-43-34-400-001	Installation of the TCAS Computer

3. Fault Confirmation
Subtask 34-43-00-740-175-A ** ON A/C NOT FOR ALL

A. Do the BITE test of the TCAS AMM 34-43-00-740-001.

Subtask 34-43-00-740-176-A ** ON A/C NOT FOR ALL

B. Do the interface test of the IR (system 1) AMM 34-14-00-740-001.

4. Fault Isolation
Subtask 34-43-00-810-126-A ** ON A/C NOT FOR ALL

A. If the BITE test of the TCAS gives a maintenance message, do the trouble shooting procedure related to the maintenance message.

Subtask 34-43-00-810-127-A ** ON A/C NOT FOR ALL

B. If the interface test of the IR 1 gives a maintenance message, do the trouble shooting procedure related to the maintenance message.

Subtask 34-43-00-810-128-A ** ON A/C NOT FOR ALL

C. If the two tests are OK:
(1) Remove the CMPTR-TCAS [1SG] AMM 34-43-34-000-001.
(2) Remove the ADIRU-1 [1FP1] AMM 34-12-34-000-001.
(a) Do a check and repair the wiring of the ARINC bus from the TCAS computer (1SG) to the ADIRU1 (1FP1): from pins AE/7A, 7B to pins AB/10C, 11C ASM 344301.
(3) Install the CMPTR-TCAS [1SG] AMM 34-43-34-400-001.
(4) Install the ADIRU-1 [1FP1] AMM 34-12-34-400-001.

[Rev.8 from Aug 2018] 2026.04.04 04:33:14 UTC