Failure of the Cooling System of the FO ND DU

TASK 31-63-00-810-985-A
Failure of the Cooling System of the FO ND DU

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 21-26-00-710-001	Operational Check of the Avionics Equipment Ventilation-System via MCDU
AMM 31-60-00-740-004	EIS System Test

3. Fault Confirmation
Subtask 31-63-00-740-370-A ** ON A/C NOT FOR ALL

A. Test
Do the EIS system test AMM 31-60-00-740-004.

4. Fault Isolation
Subtask 31-63-00-810-238-A ** ON A/C NOT FOR ALL

A. If the test gives the maintenance message DU ND FO(3WT2)/COOLING:

do the operational test of the avionics equipment ventilation AMM 21-26-00-710-001

(1) If the avionics ventilation system does not operate correctly:

(2) If the avionics ventilation system operates correctly:

(a) If you find damage, repair it.

5. Close-up
Subtask 31-63-00-740-371-A ** ON A/C NOT FOR ALL

A. Do the test given in Para. 3.A.

[Rev.8 from Aug 2018] 2026.04.04 04:30:51 UTC