The transducer is a 2 axis inclinometer (G1 & G3), and the large piece may well be part an Arian nose fairing.
See blue section " Herschel Plank" with lump at top plus gray stripe above.
http://rascmontreal.org/IYA-2009-InM...go_fairing.jpg
Now look at the dark section on the wreckage near the man's head, plus a similar gray ring.
http://www.kaieteurnewsonline.com/im...ne-2-copy1.jpg