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 causes 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 air flow
Normal operation - OPEN CIRCUIT CONFIGURATION
Both the inlet and the outlet flaps are fully open (aircraft is on the ground and the skin temperature is above a set threshold)
Normal operation- CLOSED CIRCUIT CONFIGURATION
Both the inlet and outlet flaps are fully closed. The SKIN EXCHANGE INLET BTPASS VALVE is open, allowing air to the cargo floor, eventually exiting via outflow valve (aircraft is on the ground or in-flight and the skin temperature below a set threshold)
Normal operation- 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)
Abnormal operation (AIR COND INLET VALVE always opens)- BLOWER or EXTRACT FAULT
Both inlet and outlet flaps are fully closed, SKIN EXCHANGE INLET BYPASS VALVE closed.
Abnormal operation (AIR COND INLET VALVE always opens)- BLOWER or EXTRACT FAULT- SMOKE CONFIGURATION
Once the BLOWER and EXTRACT pushbuttons 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 INLET BYPASS VALVE Closes.
