Utair faced a cockpit warning on a Boeing 737-500 after a female passenger tried to open the rear service door, mistaking it for the toilet. The aircraft, RA-73046, was cruising at about 11,000 metres over the Caspian Sea on 6 June when the alert flashed during the Moscow-Nakhchivan sector.
The Master Caution cleared quickly, and cabin crew recorded the event as a passenger error with no safety consequence. For operators, the episode underlines how a routine door-selection mistake can still trigger a flight deck alert and add unnecessary cockpit workload.