No or Incomplete FWC Automatic Call-Out Announcements

TASK 31-53-00-810-957-A
No or Incomplete FWC Automatic Call-Out Announcements

1. Possible Causes

FWC-2 [1WW2]
aircraft wiring
FWC-1 [1WW1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-50-00-710-009	Operational Test of the Automatic Call Out with the Radio Altimeter Simulator
AMM 31-50-00-740-002	Read and Decode the Hardware Pin Programming of the SDAC and FWC
ASM 315227
ASM 315228
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)

3. Fault Confirmation
Subtask 31-53-00-710-317-A

A. Not Applicable

4. Fault Isolation
Subtask 31-53-00-865-071-A

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
49VU	FWS/FWC1/SPLY	3WW	F01
121VU	EIS/FWC2/SPLY	2WW	Q07

Subtask 31-53-00-810-205-B

B. If the fault symptom is identified by the crew observation NO AUTOMATIC CALL-OUT DURING LANDING PHASE:

Open, safety and tag the circuit breaker (3WW).
Do the operational test of the automatic call-out with the Radio Altimeter Simulator AMM 31-50-00-710-009.

(1) If you do not hear the automatic call-out announcements during the test:

Replace the FWC-2 [1WW2] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.
Do the operational test of the automatic call-out with the Radio Altimeter Simulator AMM 31-50-00-710-009.

(2) If you hear incomplete automatic call-out announcements during the test:
(a) Read the pin programming related to the FWC2 AMM 31-50-00-740-002.
(b) Compare the pin programming related to the FWC2 with the state of the aircraft pin programming given in the ASM 315228.
1 If the pin programming is incorrect:

repair the aircraft wiring .

2 If the pin programming is correct:

replace the FWC-2 [1WW2] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.
Do the operational test of the automatic call-out with the Radio Altimeter Simulator AMM 31-50-00-710-009.

(3) If you hear all the automatic call-out announcements during the test:

Close the circuit breaker (3WW).
Wait 50 seconds until the initialization of the FWC1 is completed.
Open, safety and tag the circuit breaker (2WW).
Do the operational test of the automatic call-out with the Radio Altimeter Simulator AMM 31-50-00-710-009.

(a) If you do not hear all the automatic call-out announcements during the test:

Replace the FWC-1 [1WW1] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.
Close the circuit breaker (2WW).
Wait 50 seconds until the initialization of the FWC1 is completed.
Do the operational test of the automatic call-out with the Radio Altimeter Simulator AMM 31-50-00-710-009.

(b) If you hear incomplete automatic call-out announcements during the test:
1 Read the pin programming related to the FWC1 AMM 31-50-00-740-002.
2 Compare the pin programming related to the FWC1 with the state of the aircraft programming given in the ASM 315227.
a If the pin programming is incorrect:

repair the aircraft wiring .

b If the pin programming is correct:

replace the FWC-1 [1WW1] AMM 31-53-34-000-001 and AMM 31-53-34-400-001.
Close the circuit breaker (2WW).
Wait 50 seconds until the initialization of the FWC1 is completed.
Do the operational test of the automatic call-out with the Radio Altimeter Simulator AMM 31-50-00-710-009.

[Rev.8 from Aug 2018] 2026.04.04 04:30:21 UTC