VENTILATION PANEL Flashcards
What are some potential causes for the illumination of the BLOWER FAULT light?
• Low blower pressure• Duct overheat• Computer power supply failure• Smoke warning activated
What are some potential causes for the illumination of the EXTRACT FAULT light?
• Low extract pressure• Computer power supply failure• Smoke warning activated
What condition in the avionics ventilation system would cause an external horn to sound?
• BLOWER FAULT or EXTRACT FAULT illumination on the ground with both engines stopped.
Describe the avionics ventilation system.
• It is a fully automated system that considers the skin temperature and adjusts inlet and outlet flaps to optimize cooling and airflow.
Additional definitions are presented below for more information
During normal operations, the AIR COND INLET VALVE remains always closedOPEN CIRCUIT CONFIGURATION – Both the inlet and the outlet flaps are fully open (aircraft is on ground and the skin temperature is above a set threshold)CLOSED CIRCUIT CONFIGURATION – Both the inlet and outlet flaps are fully closed. The SKIN EXCHANGE INLET BYPASS VALVE is open, allowing air to the cargo under floor, eventually exiting via the outflow valve (aircraft is on the ground or in-flight and the skin temperature below a set threshold).INTERMEDIATE CIRCUIT CONFIGURATION – The inlet flap is fully closed, the outlet small flap is open (aircraft is in-flight and the skin temperature is above a set threshold).During abnormal operations, the AIR COND INLET VALVE always opens providing fresh ventilation air.BLOWER or EXTRACT FAULT – Both inlet and outlet flaps are fully closed, SKIN EXCHANGE INLET BYPASS VALVE closed.SMOKE CONFIGURATION – Once the BLOWER and EXTRACTpushbuttons have been selected to OVRD, the blower fan will stop, the extract fan will continue to run. The inlet flap closes, the small outlet flap opens, the SKIN EXCHANGE ISOLATION VALVE closes and the SKIN EXCHANGE INLET BYPASS VALVE closes.
