According to EASA CS the allowable quantitative average failure probability per flight hour for a HAZARDOUS FAILURE should be on the order of:
Domanda 125, Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license
| Between 10-5 And 10-7 (remote Probability) |
| Between 10-3 and 10-5 (probable) |
| Between 10-7 and 10-9 (extremely remote probability) |
| Less Than 10-9 (extremely Improbable) |
