One or both of the equipment cooling warning lights came on to indicate low airflow through the cooling fans (a result of the decreased air density), accompanied by the master caution light. In the next few minutes, several warning lights on the overhead panel in the cockpit illuminated. The alert sound is identical for both warnings. As it passed through an altitude of 12,040 feet (3,670 m), the cabin altitude warning horn sounded. The warning should have prompted the crew to stop climbing, but it was misidentified by the crew as a take-off configuration warning, which signals that the aircraft is not ready for take-off, and can only sound on the ground. During these checks, no one on the flight deck noticed the incorrect setting. The aircraft took off with the pressurization system still set to "manual," and the aft outflow valve partially open.Īs the aircraft climbed, the pressure inside the cabin gradually decreased. In order to carry out this check without requiring the aircraft's engines, the pressurization system was set to "manual." However, the engineer failed to reset it to "auto" on completion of the test.Īfter the aircraft was returned into service, the flight crew overlooked the pressurization system state on three occasions: during the pre-flight procedure, the after-start check, and the after take-off check. They requested a full inspection of the door. The inspection was carried out by a ground engineer, who then performed a pressurization leak check. When the aircraft arrived from London earlier that morning, the previous flight crew had reported a frozen door seal, and abnormal noises coming from the right aft service door. It was the deadliest aviation accident in Greek history. A loss of cabin pressurization incapacitated the crew, leaving the aircraft flying on autopilot until it ran out of fuel, and crashed near Grammatiko, Greece. Helios Airways Flight 522 was a scheduled passenger flight from Larnaca, Cyprus to Prague, Czech Republic, with a stopover to Athens, Greece, that crashed on 14 August 2005, killing all 121 passengers and crew on board.
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