Loss of All Aural Warnings

TASK 34-48-00-810-833-A
Loss of All Aural Warnings

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-53-34-000-001	Removal of the Flight Warning Computer (FWC)
AMM 31-53-34-400-001	Installation of the Flight Warning Computer (FWC)
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 34-48-00-740-002	BITE Test of the GPWS
ASM 344801
AMM 34-48-34-000-001	Removal of the GPWC
AMM 34-48-34-400-001	Installation of the GPWC

3. Fault Confirmation
Subtask 34-48-00-740-078-A

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

4. Fault Isolation
Subtask 34-48-00-810-097-A

A. If the test gives the maintenance message
GPWC (1WZ)/FWC1/2 (1WW1/2)/WXR1/2 (1SQ1/2):

(1) If there is no ground signal:

(2) If there is a ground signal:

(a) If there is no ground signal:

(b) If there is a ground signal:

1 If there is no ground signal:

2 If there is a ground signal:

a If there is no ground signal:

b If there is a ground signal:

install the XCVR-WEATHER RADAR, 1
do a check and repair the wiring between the GPWC and the FWC 1 and FWC 2 , the wiring between the GPWC and the weather radar transceiver or the wiring between the GPWC and the TCAS computer : pin AB/5D of the GPWC, pins AB/2H of the FWC 1 and FWC 2, pin AB/1D of the weather radar transceiver and pin AF/5B of the TCAS computer. ASM 344801

Subtask 34-48-00-740-079-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:33:17 UTC