Table 14.8.1. Number of damaged O-rings (Row B) by ambient temperature in degrees Fahrenheit (Row A) at launch for 24 shuttle flights prior to Challenger flight 51-L

Ambient Temp (°F)    # Damaged O-rings

     53                      3
     57                      1
     58                      1
     63                      1
     66                      0
     67                      0
     67                      0
     67                      0
     68                      0
     69                      0
     70                      1
     70                      1
     70                      0
     70                      0
     72                      0
     73                      0
     75                      2
     75                      0
     76                      0
     76                      0
     78                      0
     79                      0
     80                      0
     81                      0