64D: VENT AVNCS SYS FAULT (ON GROUND) SOP TO MITIGATE AIR TURN BACK CASES

Question 1

Air Turnback cases due to ECAM VENT SKIN VALVE FAULT have occurred in the past. In all these cases, the Skin Air Outlet Valve was either indicated not fully closed (Amber) or crew were unable to identify the actual position of the Skin Air Valve as the indications displayed “XX” on the CAB PRESS SD page. After detailed investigation, Airbus has identified ___ of the internal components to be the root cause of this problem.

Answer 1

mechanical fatigue

Question 2

The objective of this procedure is to reconfigure the Avionics Skin Air Inlet/ Outlet valve to fully closed position (Avionics Equipment Ventilation System in ___ configuration) to detect the valve malfunction ON GROUND itself.
“ON GROUND” the failure of Avionics Skin Air Outlet/ Inlet valve is triggered as ___ & “IN AIR” it is triggered as ___

Answer 2

• closed circuit
• VENT AVNCS SYS FAULT
• VENT SKIN VALVE FAULT

Question 3

Application of the procedure to be delayed in case of extended taxi time so that take off is performed within ___ minutes of application of procedure. This would allow for optimum ventilation of the ___ during conditions of high OAT.

Answer 3

• 10
• avionics bay

Question 4

ON GROUND (AFTER T.O. CONFIG Test):
EXTRACT pb-Sw to OVRD This action will force the avionics ventilation system into ___ (valve movement may take up to 25 seconds). In case VENT AVNCS SYS FAULT ECAM alert is triggered, crew to carry out reset as per [QRH] SYSTEM RESET TABLE. If ECAM remains, ___

Answer 4

• closed configuration
• return to bay for maintenance.