Originally Posted by ballyboley
... Our airline requires a safety report to be filed and subsequent investigation if we ever arrive at an airplane and find bleeds off or PMS set wrongly.
If this is the main thing your airline learned after the Helios accident, they did not understand what happened there.
Quote out of the final Report:
Direct Causes
1. Non-recognition that the cabin pressurization mode selector was in the MAN (manual) position during the performance of the:
a) Preflight procedure;
b) Before Start checklist; and
c) After Takeoff checklist.
...
Contributing Factors to the Accident
1. Omission of returning the pressurization mode selector to AUTO after unscheduled maintenance on the aircraft.
...
/Quote
At the time the accident happened the AMM did not demand to put the pressure mode selector to the position AUTO after the the leakage test.