Helios Airways Flight 522 - Ghost Plane

Synopsis

Helios Airways Flight 522 (HCY 522 or ZU522) was a Helios Airways Boeing 737-31S flight that crashed on 14 August 2005 at 12:04 EEST into a mountain north of Marathon and Varnavas, Greece. Rescue teams located wreckage near the community of Grammatiko 40 km (25 miles) from Athens. All 121 on board were killed.

The reason for this fatal air crash was a simple mechanical setting done by the ground engineer before the flight. Ground engineer that was checking the aircraft before the flight took off have set the pressurization control on a 'manual' setting, in which the aircraft would not pressurise automatically on ascending; the pre-takeoff check had not and will not be able to disclosed nor corrected this.

Due to this issue, on ascending, decompression would have been fairly gradual as the aircraft climbed under the control of the flight management system. The pressurisation failure warning on this model should operate when the effective altitude of the cabin air reaches 10,000 ft (3,000 m) at which altitude a fit person will have full mental capacity. At cruising height, both pilots have lost part of their metal capabilities due to the lack of oxygen, further, failing to recognize the system failure and descending to a safe altitude.

Helios AirWays Flight 522

Flight 522 - Ghost Plane - Part 1

(Video embedded from YouTube on 15 August 2009) —see Advanced Aviation Technology Ltd, undated1)

Flight 522 - Ghost Plane - Part 2

(Video embedded from YouTube on 15 August 2009) —see Advanced Aviation Technology Ltd, undated1)

Flight 522 - Ghost Plane - Part 3

(Video embedded from YouTube on 15 August 2009) —see Advanced Aviation Technology Ltd, undated1)

Flight 522 - Ghost Plane - Part 4

(Video embedded from YouTube on 15 August 2009) —see Advanced Aviation Technology Ltd, undated1)

Flight 522 - Ghost Plane - Part 5

(Video embedded from YouTube on 15 August 2009) —see Advanced Aviation Technology Ltd, undated1)
References
1. Advanced Aviation Technology Ltd (undated) Helios Airways Flight 522.1 Aircrash Unsolved [[footnote]] . Parts 1, 2, 3, 4, 5 retrieved from YouTube on 15 August 2009.

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Wikipedia - Helios Airways Flight 522
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StateMaster - Helios Airways Flight 522
Page from StateMaster offering detailed information of the accident.

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