PPRuNe Forums - View Single Post - BREAKING NEWS: airliner missing within Egyptian FIR
Old 9th Nov 2015, 18:00
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A0283
 
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@HundredPercentPlease

Parallel lines ... rudder departure scratch marks ?

Elevator hinges and THS appear less probable.

This requires measurements.

There is redundant set of actuators, and hinges, and ...

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Options:
- Rudder 7-point attachment to the fin structure.
- Three rudder actuators - unlikely, too close, for a standalone scenario,
- Structural failure exposing CFRP stiffeners or brackets - might explain the close parallel lines.
- Structural failure exposing GFRP stiffeners or brackets - might explain the close parallel lines.

or a mix of these options,

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If you extend these lines downward you stay within the 'envelope' of the plane and reach the tailcone behind the aft firewall of the APU space. However, these components have been found and are unlikely to cause these parallel lines.
So the options you get is either a lower piece of structure breaking out of the VS, and rotating up relative to the VS box, such a part is missing. Or the CFRP strip or rudder departure. In each case you have to put the tail section tail down to get these marks. Which would suggest this is not the immediate cause but a follow up fracture.

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The lower line is at about 12 degrees, the upper at about 15 degrees with the vertical ...

Last edited by A0283; 9th Nov 2015 at 18:32. Reason: ++++++
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