![]() According to the Flight Data Recorder (FDR), at 06:12:38 h and at an aircraft altitude of 12 040 ft and climbing, the cabin altitude warning horn sounded.This was the last recorded communication between the flight crew and Nicosia ACC. At 06:11:45 h, flight HCY522 was cleared to climb to F元40 and to proceed direct to the RDS (Rodos) VOR. The Captain requested cruising level 340. At 06:11:35 h, Nicosia ACC identified the flight and asked for the requested final cruising level. At 06:11:21 h, the flight crew contacted Nicosia Area Control Centre (ACC) at reporting point LOSOS, climbing through flight level (FL) 100 for FL200. The aircraft took off from Larnaca airport at 06:07:13 h.Safety valve operates at 8.25 No leaks or abnormal noises (IAW MM 21 – 32 – 21 – 725 – 001)”. In response to the write-up in the Aircraft Technical Log, the Ground Engineer documented his actions as follows: “Door and local area inspected. He performed a visual inspection of the aft service door and he carried out a cabin pressurization leak check. Immediately after the arrival of the aircraft in Larnaca, the authorized company Ground Engineer (number one) went to the Boeing 737 aircraft for the required inspections.The write-up by the cabin crew was transferred to the Aircraft Technical Log by the flight crew as “Aft service door requires full inspection.” The cabin crew made an entry in the Aircraft Cabin Defect Log that “Aft service door (starboard) seal around door freezes & hard bangs are heard during flt ”. During the flight, the cabin crew noted a problem with the right aft service door. ![]() The aircraft landed at Larnaca at 01:25 h on 14 August 2005. On 13 August 2005, on the flight prior to the accident, the Helios Airways (the Operator) Boeing 737-300 aircraft, Cyprus registration 5B-DBY, departed London-Heathrow, United Kingdom for Larnaca, Cyprus at 21:00 h. ![]()
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