Loss of the RA1 Input

TASK 34-48-00-810-804-A
Loss of the RA1 Input

1. Possible Causes

GPWC [1WZ]
wiring of the RADIO HEIGHT DATA INPUT bus from the GPWC (1WZ) to the first terminal block

2. Job Set-up Information
A. Referenced Information

3. Fault Confirmation
Subtask 34-48-00-740-056-A ** ON A/C NOT FOR ALL

A. Test
(1) Do the BITE test of the GPWS AMM 34-48-00-740-002.

Subtask 34-48-00-740-056-C ** ON A/C NOT FOR ALL

A. Test
(1) Do the BITE test of the Enhanced GPWS AMM 34-48-00-740-002.

4. Fault Isolation
Subtask 34-48-00-810-054-A

A. If the BITE test gives the maintenance message RA1 (1SA1)/GPWC (1WZ):

(1) If the fault continues:

do a check and repair the wiring of the RADIO HEIGHT DATA INPUT bus from the GPWC (1WZ) to the first terminal block ASM 344801.

Subtask 34-48-00-740-057-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:14 UTC