Result of the BITE Test of the Weather Radar 2 not Satisfactory on F/O ND/PFD

TASK 34-41-00-810-842-A
Result of the BITE Test of the Weather Radar 2 not Satisfactory on F/O ND/PFD

1. Possible Causes

DMC-2 [1WT2]
[1SQ2]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC
AMM 34-41-00-740-002	BITE Test of the Weather Radar
ASM 344101
AMM 34-41-33-000-004	Removal of the Weather Radar Transceiver
AMM 34-41-33-400-003	Installation of the Weather Radar Transceiver

3. Fault Confirmation
Subtask 34-41-00-740-122-A

A. Test
(1) Do the BITE test of the weather radar 1 with the EIS DMC selector switch on the SWITCHING panel 8VU in F/O/3 position AMM 34-41-00-740-002.

4. Fault Isolation
Subtask 34-41-00-810-104-A

A. If the test result is satisfactory:
(1) Replace the DMC-2 [1WT2] AMM 31-63-34-000-001 and AMM 31-63-34-400-001.
(2) If the fault continues:

do a check of the wiring between DMC2 (1WT2) pins AA/12G, 12H and terminal block 1860VT47 pins C, H and between DMC2 (1WT2) pins AA/12J, 12K and terminal block 1860VT48 pins C, H ASM 344101.

Subtask 34-41-00-810-105-A

B. If the test gives the maintenance message DMC1/2/3(1WT1/2/3)/WXR2(1SQ2):
(1) Replace the [1SQ2] AMM 34-41-33-000-004 and AMM 34-41-33-400-003.
(2) If the fault continues:

do a check of the wiring between weather radar transceiver 2 (1SQ2) pins AB/2D, 3D and terminal block 1860VT47 pins D, J and between weather radar transceiver 2 (1SQ2) pins AB/2G, 3G and terminal block 1860VT48 pins D, J ASM 344101.

5. Close-up
Subtask 34-41-00-740-123-A

A. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:33:06 UTC