smudge,
yes the u/c warning horn cct brkr was my first thought when I read of the incident. It is pulled on TS sorties to prevent the very loud noise causing a distraction especially at low level and critical phases of the drop as the throttles are retarded. It was part of the afterdrop/leaving DZ checks if memory serves. However if this was the case then these and the normal prelanding checks have either not been done or not done correctly.
When we first got the 'K' one of the loadmaster's pre landing checks was to ensure that the MLG drag pins were secure in the brackets. The check was removed after a few years.