Please read again the final report :
http://www.bea-fr.org/docspa/2000/f-...-sc000725a.pdf
1.12.1.3 Piece of Metal
A strip of metal about 43 centimetres long, bent at one of its ends, was found on the
runway shoulder at Slab 152 level. Its width varies from 29 to 34 mm and it has drilled
holes, some containing rivets, similar to the Cherry aeronautical type. The holes are not at
regular intervals.
On visual inspection, the piece appeared to be made of light alloy, coated on one side
with epoxy primer (greenish) and on the other side with what appeared to be red aircraft
mastic for hot sections (RTV 106). It did not appear to have been exposed to high
temperature.
This piece was not identified as part of the Concorde.
Figure 21: Piece found at line 152
and :
1.16.6.4 Examination of the Wear Strip
The wear strip found on the runway was subjected to laboratory examination:
• the strip was 435 mm long, 29 to 34 mm wide and about 1.4 mm thick. It was
made of a type TA6V alloy composed of titanium (89.67%), aluminium (7.03%),
vanadium (2.28%) and iron (1.02%). It was covered on one side in green primer
composed of an epoxy bisphenol A resin containing elements of silicate and
pigments of strontium chromate. The other side was covered in red silicon mastic
for high temperatures. The rivets, of Cherry Max type, were made of an aluminium
alloy bush - magnesium AG-5 or 5056 - and a steel stem with an alloy of
chrome-nickel-molybdenum covered with a layer of cadmium,
• the strip possessed twelve drill holes with random spacing, some off centre with
the longitudinal axis,
• the presence of circular indentations on the mastic side bears witness that the part
opposite it possessed extra drill holes. Seventeen hole marks were counted in
addition to the twelve holes drilled in the strip,
• black marks were noted on the outer side of the strip and black elastomer debris
was found jammed in one of the rivets. The spectra of these marks and deposits
are similar to the Concorde tyre.
1.16.6.5