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NickGreek
Tourist

Reged: 09/09/05
Posts: 2

Helios Airways Flight 522 "The Ghost Plane"

#105278 - 09/09/05 08:19 AM

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Edited by danescombe (12/06/07 02:18 PM)

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danescombe
Master Guide

Reged: 11/07/05
Posts: 10234
Loc: UK

Helios Airways Flight 522 "The Ghost Plane"

[Re: NickGreek]
#1067082 - 12/06/07 02:16 PM

Helios Airways Flight 522

Helios Airways Flight 522 was a Helios Airways Boeing 737-31S crashed on 14 August 2005 at 12:04 EEST into a mountainside north of Marathon and Varnavas, Greece.

Rescue teams located wreckage near the community of Grammatiko 40 kilometres (25 miles) from Athens. All 121 people on board were killed.

The cause

"Pilot incapacitation due to gradual decompression, fuel starvation" [**]

Suspicions that the aircraft had been hijacked were swiftly ruled out by Greece's foreign ministry. Initial claims that the aircraft was shot down by the fighter jets are refuted by eyewitnesses and the government.

Loss of cabin pressure and consequent pilot unconsciousness is the leading theory explaining the accident. This would account for why oxygen masks were released. Weighing against this is the fact that the pilots should have been able to descend the aircraft to a safe altitude after donning oxygen masks if they interpreted the alarm signal properly and acted before their minds were too impaired by Hypoxia .

Video:- Aircrash Investigation IV - The Ghost Plane

Wikipeadia ------>Helios Airways Flight 522
* 1 Flight & Crash
* 2 Background
* 3 Decompression hypothesis
* 4 Private Investigation
* 5 Hoaxes

Flight Path of Helios Airways Flight 522

R.I.P

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danescombe
Master Guide

Reged: 11/07/05
Posts: 10234
Loc: UK

Helios Airways Flight 522 "The Ghost Plane"-update

[Re: NickGreek]
#1247138 - 10/14/08 01:10 AM

UPDATE

One year after the accident, the Discovery Channel aired a documentary detailing a private investigation made in cooperation with Advanced Aviation Technology Ltd. It presented evidence that a design failure of the Boeing 737 may have contributed to the accident.

Contrary to the concept of redundancy, all wiring related to the pressure system were in one wiring loom to the outflow valve in the aft of the aircraft. A failure in this loom caused a pressurization incident with a Boeing 737-436 G-DOCE in May 2003.[10] During this incident the pressurisation control system presented wrong indications to the pilots and was finally switched to manual position like found in the Helios 522 wreckage.

According to the Helios 522 final report, in a previous pressurisation incident with the Helios accident aircraft: "The Captain stated that there might have been a problem with the outflow valve." The Air Accident and Incident Investigation Board (AAIB) of Cyprus was not able to reach a conclusive decision as to the causes of this previous incident, but indicated as one of two possibilities: "An electrical malfunction caused the opening of the outflow valve."

The official accident investigation board was informed by Discovery Channel of the similarities with the G-DOCE incident. But in the final report neither the G-DOCE incident nor any wiring loom issues were mentioned.

Hoaxes

News media widely reported that shortly before the crash a passenger sent a text message indicating that one of the flight crew had become blue in the face, or roughly translated as "The pilot is dead. Farewell, my cousin, here we're frozen." Police later arrested Nektarios-Sotirios Voutas, who admitted that he had made up the story and given several interviews in order to get attention.[11] Voutas was tried by a court of first instance on 17 August 2005 and received a suspended 6-month imprisonment sentence under a 42-month probation term.[12]
Another hoax involved photographs allegedly showing the aircraft being chased by Greek fighter jets. The photos were actually of a Helios 737-800 (rather than the crashed 737-300) with the registration altered and the fighter jets added
source

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