ARINC Out Bus Wraparound Failure on Channel A and B (Transmitters TX1 Wraparound Signal Failures)

TASK 73-21-01-810-968-A
ARINC Out Bus Wraparound Failure on Channel A and B (Transmitters TX1 Wraparound Signal Failures)

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 73-21-00-810-885-A	ARINC Out Bus Wraparound Failure (Transmitters TX1 Wraparound Signal Failures) Channel A
TSM TASK 73-21-00-810-886-A	ARINC Out Bus Wraparound Failure (Transmitters TX1 Wraparound Signal Failures) Channel B

3. Fault Confirmation
Subtask 73-21-01-710-211-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Fault Isolation
Subtask 73-21-01-810-469-A ** ON A/C NOT FOR ALL

A. Do the two tasks as follows:
(1) Do the troubleshooting procedure (Ref. TSM TASK 73-21-00-810-885).
(2) Do the troubleshooting procedure (Ref. TSM TASK 73-21-00-810-886).

5. Close-up
Subtask 73-21-01-860-207-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) Make sure that the work area is clean and clear of tools and other items.

[Rev.8 from Aug 2018] 2026.04.04 04:36:43 UTC