It was posted that the Rolls Royce engine control (in the BA Heathrow accident) and the PW4000 engine control are both made by Goodrich (the implication that they both might have the same s/w error) Not true - the Trent 800 engine control was done by Lucas - now part of Goodrich. The PW4000 engine controls were done by Hamilton Standard (now Hamilton Sundstrand).
Nitpicking, but... Both Goodrich ( Heritage BFGoodrich Aerospace as well as the Rohr and Lucas divisions) and Hamilton Sundstrand are now owned by United Technologies... who also own Pratt.
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