No Static Inverter Indication on the Lower ECAM Display Unit

TASK 24-28-00-810-802-A
No Static Inverter Indication on the Lower ECAM Display Unit

1. Possible Causes

FWC-1 [1WW1]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 24-28-00-710-001	Operational Test of the Static Inverter when the Aircraft Electrical Circuits are Energized from the External Power
AMM 31-50-00-710-001	Ground Scanning of the Central Warning System
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 24-28-00-710-052-A ** ON A/C NOT FOR ALL

A. Test
Do the operational test of the static inverter AMM 24-28-00-710-001.
(1) If during the test:

the correct indication does not appear on the ECAM

(a) release the EMERG GEN pushbutton.
(b) disconnect the BUS TIE to allow resumption of normal electrical power supplies.
(c) do not reset the FWC1.
(d) do the Ground Scanning of the FWC2 AMM 31-50-00-710-001 and check for any bite information being received from the FWC1.

4. Fault Isolation
Subtask 24-28-00-810-055-A ** ON A/C NOT FOR ALL

A. If the Ground Scanning gives the fault codes 0053,0054 or 0055:

replace the FWC-1 [1WW1] AMM 31-53-34-000-001 AMM 31-53-34-400-001.

Subtask 24-28-00-710-053-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:26:43 UTC