But the inquiry report says that the flight crew failed to identify cabin-altitude warnings and did not notice indications that mask deployment had occurred. Passenger oxygen masks deployed in the cabin as the aircraft climbed through 18,200ft. The investigators also list “ineffectiveness of measures” taken by Boeing in response to previous pressurisation incidents on the aircraft type.īut the report also points to a creeping, underlying failure of safety oversight by regulatory authorities.Īs the Helios 737 was climbing through 16,000ft (4,850m) – having been cleared to flight level 340 (34,000ft) – the captain contacted the company’s operations centre to report a take-off configuration warning and a problem with the equipment cooling system. It cites “inadequate application” of crew resource management principles. But the aircraft failed to pressurise as it climbed to cruise altitude, incapacitating the crew and leading to the 737’s crashing as the engines ran out of fuel.Īside from the immediate contributory factors the final report identifies four latent causes of the accident, including deficiencies in the operator’s organisation, safety culture and quality management. Helios flight ZU522 departed the Cypriot city of Larnaca for Prague on 14 August last year with 115 passengers and six crew members. The final report into the accident, released today, shows that the crew did not realise that the pressurisation selector was in the ‘manual’ position while carrying out pre-flight procedures or while reading checklists – it says the switch could have been left in the ‘manual’ position, rather than returned to the ‘automatic’ position, during non-scheduled maintenance. Investigators have concluded that an incorrectly-set cabin pressurisation switch, and the failure to recognise warnings of oxygen depletion, led to the fatal loss of a Helios Airways Boeing 737-300 aircraft in Greece last year. Airline Business special: CEOs to watch in 2021.FlightGlobal Guide to Business Aviation Training and Safety 2021.EDGE: A new global force in aerospace and defence. Shell Aviation: What will it take to Decarbonise Aviation?.
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