Loss of the Interface between the Weather Radar Transceiver 1 and the Radio Altimeter Transceiver 1

TASK 34-42-00-810-831-A
Loss of the Interface between the Weather Radar Transceiver 1 and the Radio Altimeter Transceiver 1

1. Possible Causes

XCVR-RA, 1 [2SA1]
XCVR-WEATHER RADAR, 1 [1SQ1]
wiring from the radio altimeter transceiver 1 to the weather radar transceiver 1

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 34-41-00-740-002	BITE Test of the Weather Radar
ASM 344102
AMM 34-41-33-000-004	Removal of the Weather Radar Transceiver
AMM 34-41-33-400-003	Installation of the Weather Radar Transceiver
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 34-42-00-740-090-A

A. Test
Do the BITE test of the weather radar AMM 34-41-00-740-002.

4. Fault Isolation
Subtask 34-42-00-810-084-A

A. If the test gives the maintenance message RA1(2SA1)/WXR1(1SQ1):

Swap the XCVR-RA, 1 [2SA1] and the radio altimeter transceiver 2 AMM 34-42-33-000-001 and AMM 34-42-33-400-001.

(1) If the fault stops:

(2) If the fault continues:

(a) If the fault continues:

Remove the weather radar transceiver 1
Remove the radio altimeter transceiver 1
Do a check and repair the wiring from the radio altimeter transceiver 1 to the weather radar transceiver 1 : from pins AB/2G, 3G to pins AB/1C, 2C ASM 344102
Install the weather radar transceiver 1
Install the radio altimeter transceiver 1.

Subtask 34-42-00-740-091-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:10 UTC