So my boss gave me a question today as my daily quiz: Let's say an A321 is cruising on a 6-hour flight. It reaches FL350 30 minutes after take-off. After another 8 minutes there's a discrepancy between 2 altimeters. PFD 1 reads 35000 ft while PFD 2 reads 34500 ft. The pilot decides to make an air-turn back due to insufficient fuel, despite having enough fuel filled while on ground.
The question is, did the pilot make the right decision?
I've done some research. The difference between 2 altimeters is not supposed to exceed 245 ft at 35000 ft. But I don't know how that is related to fuel shortage. Worst case scenario the static port is contaminated.