Because of a lack of cooling air another alarm activated, indicating a temperature warning for the avionics bay. Then, at 14,000 feet, the oxygen masks automatically deployed and a master caution light illuminated in the cockpit. The crew possibly thought it was an erroneous takeoff configuration warning because the sound is identical. Cabin altitude is usually held around 8,000 feet. This occurred as the 737 passed through an altitude of 10,000 feet. As the airplane climbed over the Mediterranean the cabin altitude alert horn sounded. The flight departed Larnaca at 09:07 for the leg to Athens with a planned flying time of 1 hour and 23 minutes. In the morning the 737 was to operate Flight 522 from Larnaca to Prague, Czech Republic with an intermediate stop at Athens, Greece. The PMS mode was apparently not noted during the pre-departure checks by the crew. The outflow valves were one-third in the open position which meant that the cabin would not pressurize after takeoff. In manual mode the crew had to manually open or close the outflow valves in order to control the cabin pressure. 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. Helios' Boeing 737-300 5B-DBY underwent maintenance on the night prior to the accident. Accident investigation report completed and information capturedĢ km (1.3 mls) from Grammatikos ( Greece)Īthens-Elefthérios Venizélos International Airport (ATH/LGAV), Greece
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