That right. The 100% level was set at some point during the design process. Later they found ways to slightly increase the thrust. Rather than recalibrate all the numbers, they just kept using the original &quot;100%&quot; and called the new level &quot;104%.&quot;<p>Basically, it&#x27;s &quot;104% of what the engineers circa 1975 thought the level would be,&quot; not 104% of what the hardware was rated for.