Report of the PRESIDENTIAL COMMISSION
on the Space Shuttle Challenger Accident
![Above [upper left], foot long icicles on a lower level of the Fixed Service Structure frame the attachment point where the Orbiter is attached to the external tank (arrow). Icing was even more extensive at upper levels of the service structure [(upper right, lower left)]. At right below is a ground communications box (not used during launch) rendered inoperable by heavy ice.](https://www.nasa.gov/wp-content/uploads/static/history/rogersrep/v1p113.jpg)
Above [upper left], foot long icicles
on a lower level of the Fixed Service Structure frame the attachment
point where the Orbiter is attached to the external tank (arrow).
Icing was even more extensive at upper levels of the service
structure [(upper right, lower left)]. At right below is a ground
communications box (not used during launch) rendered inoperable by
heavy ice.
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