I was reading in one of my company notices that we can’t perform config 1+f takeoff on the Airbus A320 if we have the following faults.
- SFCC SLAT CHANNEL FAULT
- ADR 2 FAULT
- IR 2 INOPERATIVE
Could someone explain the reasoning behind this?
First of all SFCC1 regulates the engines idle, lo or hi, according to the Flaps/slats configuration, for instance to provide low idle at initial descent
Also SFCC1 uses the blue hydraulic circuit for Slats, in hydraulic emergency case, only blue might be available as being generated by the RAT therefore SFCC1 fault is a no go, SO I assume at takeoff SFCC1 is available
SFCC1 uses primary ADIRU1 so if ADIRU1 is also faulty we go into a no go condition
Now if ADIRU2 is faulty, SFCC1 should rely on a single airspeed data, therefore if the speed is incorrect premature automatic retraction of the flaps might occur at takeoff, that is going from 1+F to 1 automatically, so take off with configuration 1+F is prohibited with these faults at takeoff