Some 56 trials were "first in class" and were performed only on the lead ship or an alternate ship, while the remainder were performed on all ships until the Trials Index was modified.
Environ 56 essais portaient seulement sur le premier navire de la classe ou sur un autre navire, tandis que le reste des essais visaient tous les navires, et ce, jusqu’à ce que l’index des essais soit modifié.