![]() ![]() : 4 The captain of the flight was Hans-Jürgen Merten, a 58-year-old German contract pilot hired by Helios for holiday flights, who had been flying for 35 years (previously for Interflug from 1970 to 1991), and had accrued a total of 16,900 flight hours (including 5,500 hours on the Boeing 737). : 3 It was scheduled to leave Larnaca at 09:00 and fly to Prague Ruzyně International Airport, with a stop off at Athens International Airport, where it was due to arrive at 10:45. The plane had arrived at Larnaca International Airport at 01:25 local time on the day of the accident. Besides the downed aircraft, the Helios fleet also included two leased Boeing 737-800s and an Airbus A319-100, which were delivered on. It was then leased by Helios Airways on 16 April 2004, and was re-registered 5B-DBY with the nickname Olympia. ![]() The aircraft involved in this accident, initially registered as D-ADBQ, was a Boeing 737-300, first flown on 29 December 1997, and was operated by DBA from 1998 until 2004. The negligent nature of the accident led to lawsuits being filed against Helios Airways and Boeing, with the former also being shut down by the government of Cyprus the following year. This caused the plane not to be pressurized during the flight and resulted in nearly everyone on board suffering from generalized hypoxia, thus resulting in a ghost flight. Īn investigation into the crash by the Air Accident Investigation and Aviation Safety Board (AAIASB) concluded that the crew had neglected to set the pressurization system to automatic during the take-off checks. It is the deadliest aviation accident in Greek history. Shortly after take-off on 14 August 2005, air traffic control (ATC) lost contact with the aircraft operating the flight, named Olympia it eventually crashed near Grammatiko, Greece, killing all 121 passengers and crew on board. Helios Airways Flight 522 was a scheduled passenger flight from Larnaca, Cyprus, to Prague, Czech Republic, with a stopover in Athens, Greece. Prague Ruzyně International Airport, Czech Republic However, as the altitude increases more and more oxygen is required to be added.5B-DBY, the aircraft involved in the accident, 3 days before the crashĬrashed following crew incapacitation due to loss of pressurizationģ8☁3.894′N 23★8.214′E / 38.231567°N 23.970233☎ / 38.231567 23.970233 At lower levels, a mixture of air and oxygen is required to maintain the alveolar pressure. Above this altitude, oxygen needs to be artificially added to the body. The partial pressure of 55 mm Hg is considered the minimum pressure of oxygen required to sustain normal functions. Even at sea level, the alveolar oxygen pressure is only 14% (103 mm Hg).Īs the altitude increases, the partial pressure of oxygen in the alveoli decreases to the point where it cannot cater to bodily functions. This together with the requirement for the pressure difference to be the same between the lungs and the atmosphere, the alveoli cannot take in the entire 21% of the oxygen in the atmosphere. Because this is a continuous process, there is always water vapor and carbon dioxide present in the alveoli. The body takes in the oxygen, and in return, it passes water vapor and carbon dioxide into the alveoli. This air is then passed into tiny, microscopic structures called alveoli where the gas exchange occurs between the capillaries and the alveoli. As oxygen makes 21% of this pressure, the partial pressure of oxygen is 160 mm Hg and that of Nitrogen is 600 mm Hg. The total pressure exerted by these in the atmosphere is 760 mm Hg. ![]()
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