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<blockquote data-quote="Spartiatis" data-source="post: 1056142238" data-attributes="member: 6174"><p>Εχεις απόλυτο δίκιο, αλλά σε ορισμένες περιπτώσεις μπορεί να δημιουργήσει άλλου είδους μοιραία προβλήματα, όπως στην περίπτωση της Japan Airlines - JL123, το 1985, όπου 520 άτομα έχασαν την ζωή τους.</p><p> </p><p><a href="http://en.wikipedia.org/wiki/Japan_Airlines_Flight_123#Cause" target="_blank">http://en.wikipedia.org/wiki/Japan_Airlines_Flight_123#Cause</a></p><p> </p><p>Cause</p><p><a href="http://en.wikipedia.org/wiki/File:747-tailstrike.gif" target="_blank"><img src="http://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/747-tailstrike.gif/300px-747-tailstrike.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a> <a href="http://en.wikipedia.org/wiki/File:747-tailstrike.gif" target="_blank"><img src="http://bits.wikimedia.org/skins-1.17/common/images/magnify-clip.png" alt="" class="fr-fic fr-dii fr-draggable " style="" /></a></p><p>An animation of the aircraft's tailstrike incident</p><p></p><p></p><p>The official cause of the crash according to the report published by Japan's then <a href="http://en.wikipedia.org/wiki/Aircraft_and_Railway_Accidents_Investigation_Commission" target="_blank">Aircraft Accidents Investigation Commission</a> is as follows:</p><ol> <li data-xf-list-type="ol">The aircraft was involved in a <a href="http://en.wikipedia.org/wiki/Tailstrike" target="_blank">tailstrike</a> incident at Osaka International Airport on 2 June 1978, which damaged the aircraft's <a href="http://en.wikipedia.org/wiki/Rear_pressure_bulkhead" target="_blank">rear pressure bulkhead</a>.</li> <li data-xf-list-type="ol">The <strong><u><span style="font-size: 12px">subsequent repair of the bulkhead did not conform to Boeing's approved repair methods.</span></u></strong> The Boeing technicians fixing the aircraft u<strong><u><span style="font-size: 12px">sed two separate doubler plates,</span></u></strong> one with two rows of rivets and one with only one row while their procedure calls for one continuous doubler plate with three rows of <a href="http://en.wikipedia.org/wiki/Rivet" target="_blank">rivets</a> to reinforce the damaged bulkhead.<a href="http://en.wikipedia.org/wiki/Japan_Airlines_Flight_123#cite_note-12" target="_blank">[13]</a> <strong><u><span style="font-size: 12px">This reduced the part's resistance to </span></u></strong><a href="http://en.wikipedia.org/wiki/Metal_fatigue" target="_blank"><strong><span style="font-size: 12px">metal fatigue</span></strong></a><strong><u><span style="font-size: 12px"> by 70%.</span></u></strong> According to the <a href="http://en.wikipedia.org/wiki/Federal_Aviation_Administration" target="_blank">Federal Aviation Administration</a>, the one "doubler plate" which was specified for the job (the Federal Aviation Administration calls it a "splice plate" - essentially a patch) was cut into two pieces parallel to the stress crack it was intended to reinforce, "to make it fit".<a href="http://en.wikipedia.org/wiki/Japan_Airlines_Flight_123#cite_note-13" target="_blank">[14]</a> This negated the effectiveness of two of the rows of rivets. During the investigation <strong><u>Boeing calculated that this incorrect installation would fail after approximately 10,000 pressurizations; the aircraft accomplished 12,318 take-offs between the installation of the new plate and the final accident.</u></strong></li> <li data-xf-list-type="ol">When the bulkhead gave way, the resulting <a href="http://en.wikipedia.org/wiki/Explosive_decompression" target="_blank">explosive decompression</a> ruptured the lines of all four <a href="http://en.wikipedia.org/wiki/Hydraulic" target="_blank">hydraulic</a> systems and blew off the <a href="http://en.wikipedia.org/wiki/Vertical_stabilizer" target="_blank">vertical stabilizer</a>. With the aircraft's <a href="http://en.wikipedia.org/wiki/Aircraft_flight_control_system" target="_blank">flight controls</a> disabled, the aircraft became uncontrollable.</li> </ol></blockquote><p></p>
[QUOTE="Spartiatis, post: 1056142238, member: 6174"] Εχεις απόλυτο δίκιο, αλλά σε ορισμένες περιπτώσεις μπορεί να δημιουργήσει άλλου είδους μοιραία προβλήματα, όπως στην περίπτωση της Japan Airlines - JL123, το 1985, όπου 520 άτομα έχασαν την ζωή τους. [URL]http://en.wikipedia.org/wiki/Japan_Airlines_Flight_123#Cause[/URL] Cause [URL="http://en.wikipedia.org/wiki/File:747-tailstrike.gif"][IMG]http://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/747-tailstrike.gif/300px-747-tailstrike.gif[/IMG][/URL] [URL="http://en.wikipedia.org/wiki/File:747-tailstrike.gif"][IMG]http://bits.wikimedia.org/skins-1.17/common/images/magnify-clip.png[/IMG][/URL] An animation of the aircraft's tailstrike incident The official cause of the crash according to the report published by Japan's then [URL="http://en.wikipedia.org/wiki/Aircraft_and_Railway_Accidents_Investigation_Commission"]Aircraft Accidents Investigation Commission[/URL] is as follows: [LIST=1] [*]The aircraft was involved in a [URL="http://en.wikipedia.org/wiki/Tailstrike"]tailstrike[/URL] incident at Osaka International Airport on 2 June 1978, which damaged the aircraft's [URL="http://en.wikipedia.org/wiki/Rear_pressure_bulkhead"]rear pressure bulkhead[/URL]. [*]The [B][U][SIZE=3]subsequent repair of the bulkhead did not conform to Boeing's approved repair methods.[/SIZE][/U][/B] The Boeing technicians fixing the aircraft u[B][U][SIZE=3]sed two separate doubler plates,[/SIZE][/U][/B] one with two rows of rivets and one with only one row while their procedure calls for one continuous doubler plate with three rows of [URL="http://en.wikipedia.org/wiki/Rivet"]rivets[/URL] to reinforce the damaged bulkhead.[URL="http://en.wikipedia.org/wiki/Japan_Airlines_Flight_123#cite_note-12"][13][/URL] [B][U][SIZE=3]This reduced the part's resistance to [/SIZE][/U][/B][URL="http://en.wikipedia.org/wiki/Metal_fatigue"][B][SIZE=3]metal fatigue[/SIZE][/B][/URL][B][U][SIZE=3] by 70%.[/SIZE][/U][/B] According to the [URL="http://en.wikipedia.org/wiki/Federal_Aviation_Administration"]Federal Aviation Administration[/URL], the one "doubler plate" which was specified for the job (the Federal Aviation Administration calls it a "splice plate" - essentially a patch) was cut into two pieces parallel to the stress crack it was intended to reinforce, "to make it fit".[URL="http://en.wikipedia.org/wiki/Japan_Airlines_Flight_123#cite_note-13"][14][/URL] This negated the effectiveness of two of the rows of rivets. During the investigation [B][U]Boeing calculated that this incorrect installation would fail after approximately 10,000 pressurizations; the aircraft accomplished 12,318 take-offs between the installation of the new plate and the final accident.[/U][/B] [*]When the bulkhead gave way, the resulting [URL="http://en.wikipedia.org/wiki/Explosive_decompression"]explosive decompression[/URL] ruptured the lines of all four [URL="http://en.wikipedia.org/wiki/Hydraulic"]hydraulic[/URL] systems and blew off the [URL="http://en.wikipedia.org/wiki/Vertical_stabilizer"]vertical stabilizer[/URL]. With the aircraft's [URL="http://en.wikipedia.org/wiki/Aircraft_flight_control_system"]flight controls[/URL] disabled, the aircraft became uncontrollable. [/LIST] [/QUOTE]
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