Input transient voltage of a regulator
Yes.  The two specifications referred to in the documentation are ratings for aircraft power systems, often nominally 28 volts.  Your converter will operate normally up to 60 volts.  Then, per the spec, the one-second transient period begins when the input voltage exceeds 60 volts and can be as high as 80 volts throughout the one-second period, but should return to the normal operating input voltage (&lt; 60 volts) by the end of the one-second period.