Report of the PRESIDENTIAL COMMISSION
on the Space Shuttle Challenger Accident
![Chart 2-1 [Left] presented by Thiokol's Roger Boisjoly summarizing primary concerns with the field joint and its O-ring seals on the boosters.
Boisjoly's Chart 2-2 [Right] indicating concern about temperature effect on seal actuation time (handwritten).](https://www.nasa.gov/wp-content/uploads/static/history/rogersrep/v1p89.jpg)
Chart 2-1 [Left] presented by
Thiokol's Roger Boisjoly summarizing primary concerns with the field
joint and its O-ring seals on the boosters.
Boisjoly's Chart 2-2 [Right]
indicating concern about temperature effect on seal actuation time
(handwritten).
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