Loss of the GMT Indication on the Lower ECAM DU

TASK 31-21-00-810-806-A
Loss of the GMT Indication on the Lower ECAM DU

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

3. Fault Confirmation
Subtask 31-21-00-865-054-A

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

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C ALL
121VU	CFDS/CFDIU/SPLY	2TW	J18

Subtask 31-21-00-710-052-A

B. Do the clock setting AMM 31-21-00-750-002.

4. Fault Isolation
Subtask 31-21-00-810-055-A

A. If the fault symptom is identified by GMT indication in amber crosses on the lower ECAM DU:

(1) If the circuit breaker trips:

(2) If the fault continues

Subtask 31-21-00-810-057-A ** ON A/C NOT FOR ALL

B. If the Log book mentions the loss of expected time at waypoint on the ND:

(1) If the fault continues:
(a) For a DMC2 related fault (fault on the first officer side)

do a check and repair the wiring between the CFDIU (1TW) and the DMC 2 (1WT2) from pins AB/2H, 2J to pins AA/15D, 15E ASM 313203.

(b) For a DMC1 related fault (fault on the captain side)

do a check and repair the wiring between the CFDIU (1TW) and the DMC 1 (1WT1) from pins AA/2B, 2C to pins AA/15D, 15E ASM 313203.

Subtask 31-21-00-810-057-B ** ON A/C NOT FOR ALL

B. If the Log book mentions the loss of expected time at waypoint on the ND:

(1) If the fault continues:
(a) For a DMC2 related fault (fault on the first officer side)

do a check and repair the wiring between the CFDIU (1TW) and the DMC 2 (1WT2) from pins AB/2H, 2J to pins AD/7E, 7F ASM 313203.

(b) For a DMC1 related fault (fault on the captain side)

do a check and repair the wiring between the CFDIU (1TW) and the DMC 1 (1WT1) from pins AA/2B, 2C to pins AD/7E, 7F ASM 313203.

Subtask 31-21-00-860-050-A

C. Make sure that the GMT indication is shown on the lower ECAM DU.

[Rev.8 from Aug 2018] 2026.04.04 04:29:48 UTC