Helios Airways Flight HCY522 Aircraft Accident Report. This is the one of the debated/interesting aspects of the accident. The numerous safety deficiencies behind Helios Airways HCY 522 accident. Although the masks in the passenger cabin deployed, the crew were unaware of this and didn't realize the extent of the problem. Simply adhering to SOPs, checklists and procedures would have trapped their mistake long before it became a fatal error. Helios Flight 522 crashed when the crew unknowingly suffered hypoxia. The way I look at it, this crew failed numerous times. Quick switch back to AUTO would have fixed their problem. But what else could it be? What are we not configured for? One nice glance at the overhead panel would have shown the green "MANUAL" light on in the pressurization panel. On the other hand, even if you couldn't put 2 and 2 together, you would think the crew would at least have considered if anything was wrong with any of their configuration? Yes, gear is up, flaps are up, trims are all fine and set. That confused the crew, because they kept referring to the takeoff configuration horn and why were they getting that in the air? Granted, that's a fair point. Doing ANY of these could have found their mistake.īoeing did make the cabin altitude warning sound the same as the takeoff configuration warning. As a personal technique, once the after takeoff checklist is complete and squared away, I always check the pressurization values: namely, cabin altitude and what the cabin climb rate is.
Most airlines also have a SOP that requires a check of pressurization through 10,000 ft (or) 18,000 ft. But what exactly caused the crash of this so-called 'ghost plane' The flight in question Helios Airways was a low-cost airline based in Larnaca, Cyprus. It involved a Boeing 737 that came down near Grammatiko in eastern Greece.
There is a provision on this checklist to check/set the pressurization and bleeds. The crash of Helios Airways flight 522 is one of the most unusual and shocking aviation accidents of the 21st century. "Pressurization" challenge/response format where the other pilot calls out something like, "AUTO - Set for xxxx" Second time, part of checklists at gate (eg, Before Start).
#Helios 522 manual
We ensure the switch is in AUTO, and the green ALTN and MANUAL lights are extinguished. Bottom line sadly is the crew missed it no less than THREE separate times.įirst time, part of the preflight cockpit flow. With the help of experiments, dramatic reconstructions, computer graphics and interviews, UK aviation expert Kim O'Neil recreates a detailed time-line of the crash and unravels the mysteries of the accident.I don't see the mechanic being the primary fault. Why did the plane lose contact with Air Traffic Control? Why were the crew unconscious? Who tried to fly the plane shortly before the crash? What caused the de-pressurisation in the plane's cabin and how did the plane crash?īy retelling the drama, as witnessed by relatives of the crash victims and those first on the scene, this hour-long special uncovers what might have led to the disaster. But the Cypriot flight failed to reach its destination, instead crashing into the countryside outside Athens, killing all on board.Īhead of the forthcoming anniversary, Aircrash Unsolved: The Mystery of Helios 522 investigates the mysteries surrounding the worst and most puzzling air accident ever to happen in Greece. The pressurization system was checked, but after completion of the tests the Pressurization Mode Selector (PMS) was reportedly left in the 'Manual' position instead of the 'Auto' mode. There were 121 people on board, the majority of them holiday makers and children. Narrative: Helios Boeing 737-300 5B-DBY underwent maintenance on the night prior to the accident. At 09.07am on 14th August 2005, Helios Airways flight 522 left Larnaca in Cyprus bound for Prague via Athens.
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