Loss of the ADR 3 BUS 3 for the ELAC 1

TASK 27-93-00-810-850-A
Loss of the ADR 3 BUS 3 for the ELAC 1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 34-11-00-810-861-A	Different Angle of Attack Value on the three ADIRUs
TSM TASK 34-13-00-810-998-A	Altitude or Airspeed Discrepancy between CAPT PFD - F/O PFD - STDBY/ISIS
TSM TASK 34-13-00-810-998-B	Altitude or Airspeed Disagree between the CAPT PFD or F/O PFD and Standby Horizon Indicator or ISIS (Aircraft with RVSM capability on the three ADIRUs)
ASM 279250
AMM 27-93-34-000-001	Removal of the ELAC
AMM 27-93-34-400-001	Installation of the ELAC
AMM 27-96-00-740-001	BITE Test of the EFCS (Ground Scanning)

3. Fault Confirmation
Subtask 27-93-00-740-094-A

A. Test
(1) Do the BITE test of the EFCS (ground scanning) AMM 27-96-00-740-001.

4. Fault Isolation
Subtask 27-93-00-810-099-A

A. If the BITE test gives the maintenance message:
ELAC1 COM OR BUS3 FROM ADR3

(1) If the fault continues:

do a check and repair the wiring of the DGI 07 signal from the ELAC 1 (2CE1) to the first terminal block, COM part only ASM 279250.

(2) If the fault continues:

(a) Altitude or Airspeed Discrepancy between CAPT PFD and F/O PFD (Ref. TSM TASK 34-13-00-810-998)
(b) Different Angle of Attack Value on the three ADIRUs (Ref. TSM TASK 34-11-00-810-861).

Subtask 27-93-00-740-095-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:58 UTC