Loss of the ENG1 N2 Indication on the Upper ECAM DU Detected by the DMC1

TASK 31-63-81-810-814-A
Loss of the ENG1 N2 Indication on the Upper ECAM DU Detected by the DMC1

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 31-60-00-740-002	Perform Electronic Instrument System (EIS) Input Test
ASM 316104
AMM 31-63-22-000-001	Removal of the Display Unit
AMM 31-63-22-400-001	Installation of the Display Unit
AMM 31-63-34-000-001	Removal of the DMC
AMM 31-63-34-400-001	Installation of the DMC

3. Fault Confirmation
Subtask 31-63-81-740-076-A ** ON A/C NOT FOR ALL

A. Test
Do the EIS input test AMM 31-60-00-740-002.

4. Fault Isolation
Subtask 31-63-81-810-066-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message:
DMC1: ENG1 N2 DSPLY ERR

on the ECAM control panel, set the UPPER DISPLAY potentiometer to OFF and do the test given in Para. 3.

(1) If this test gives the maintenance message:
DMC1: ENG1 N2 DSPLY ERR

(a) If the fault continues:

do a check of the wiring from DMC1 (1WT1) pins AB/11B, 11C to the first terminal block ASM 316104.

1 If there is no continuity:

2 If there is continuity:

do a check and repair the wiring from DMC1 (1WT1) pins AB/11D, 11E to the first terminal block ASM 316104.

(2) If this test gives no maintenance message:

(a) If the fault continues:

do a check of the wiring from upper ECAM DU (4WT1) pins AA/35, 36 to the first terminal block ASM 316104.

1 If there is no continuity:

2 If there is continuity:

do a check and repair the wiring from upper ECAM DU (4WT1) pins AA/38, 39 to the first terminal block ASM 316104.

Subtask 31-63-81-740-077-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:30:54 UTC