Failure of the Input Refresh Rate or Transmission Error from RA 2 to ADR 3

TASK 34-13-81-810-874-A
Failure of the Input Refresh Rate or Transmission Error from RA 2 to ADR 3

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 2053230
AMM 34-12-34-000-001	Removal of the ADIRU
AMM 34-12-34-400-001	Installation of the ADIRU
AMM 34-13-00-740-003	SYSTEM TEST of the ADR
ASM 344202
AMM 34-42-33-000-001	Removal of the Radio Altimeter Transceiver
AMM 34-42-33-400-001	Installation of the Radio Altimeter Transceiver

3. Fault Confirmation
Subtask 34-13-81-740-169-A ** ON A/C NOT FOR ALL

A. Test
Do the system test of the ADR 3 AMM 34-13-00-740-003.

4. Fault Isolation
Subtask 34-13-81-810-126-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message RA2(2SA2)/ ADIRU3(1FP3):

(1) If the fault continues:

do a check for continuity of the aircraft wiring from the RA transceiver 2 (2SA2) to the ADIRU 3 (1FP3):
pins AB/2G, 3G to pins AA/14J, 14K for the ALTITUDE BUS 2 O/P bus ASM 344202.

(a) If there is no continuity:

(b) If there is continuity:

remove the RA transceiver 2 (2SA2) AMM 34-42-33-000-001.
do a check and replace if necessary the coaxial cable from the RA transceiver 2 (2SA2) (pin AA/C) and the RA reception antenna (5SA2) ASM 344202 ESPM 2053230.
do a check and replace if necessary the coaxial cable from the RA transceiver 2 (2SA2) (pin AB/C) and the RA transmission antenna (6SA2) ASM 344202 ESPM 2053230.
install the RA transceiver 2 (2SA2) AMM 34-42-33-400-001.

1 If the fault continues:

Subtask 34-13-81-740-170-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:32:38 UTC