Failure of the Input Refresh Rate or Transmission Error from RA 1 to ADR 1

TASK 34-13-81-810-869-A
Failure of the Input Refresh Rate or Transmission Error from RA 1 to ADR 1

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 344201
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 34-13-81-740-159-A ** ON A/C NOT FOR ALL

A. Test
Do the system test of the ADR 1 AMM 34-13-00-740-003.

4. Fault Isolation
Subtask 34-13-81-810-121-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message RA1(2SA1)/ ADIRU1(1FP1):

(1) If the fault continues:

do a check for continuity of the aircraft wiring from the RA transceiver 1 (2SA1) to the ADIRU 1 (1FP1):
pins AB/2G, 3G to pins AA/6D, 6E for the ALTITUDE BUS 2 O/P bus ASM 344201.

(a) If there is no continuity:

(b) If there is continuity:

remove the RA transceiver 1 (2SA1) AMM 34-42-33-000-001.
do a check and replace if necessary the coaxial cable from the RA transceiver 1 (2SA1) (pin AA/C) and the RA reception antenna (5SA1) ASM 344201 ESPM 2053230.
do a check and replace if necessary the coaxial cable from the RA transceiver 1 (2SA1) (pin AB/C) and the RA transmission antenna (6SA1) ASM 344201 ESPM 2053230.
install the RA transceiver 1 (2SA1) AMM 34-42-33-400-001.

1 If the fault continues:

Subtask 34-13-81-740-160-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