Method for monitoring the occurrence of fire in an engine

A Method for monitoring an engine of an aircraft supplied with dihydrogen, comprising a safety device comprising a safety valve that is movable between an open position in which the engine is supplied with dihydrogen and a closed position in which the engine is no longer supplied with dihydrogen, an engine fire detection system, a dihydrogen leak detection system and an engine damage detection system, and comprising electronic circuitry adapted to implement the monitoring method, the monitoring method comprising:

• if a locking authorisation is given, the locking authorization is given according to criteria linked to the availability of another engine of the aircraft, and
• if one out of three conditions A, B and C is true, then the safety device closes the safety valve, with:
• the condition A is true if an engine fire detection system detects a fire,
• the condition B is true if a dihydrogen leak detection system detects a dihydrogen leak, and
• the condition C is true if an engine damage detection system detects engine damage.