A flight must not be commenced or continued unless the aircraft's scheduled performance, considering all factors which significantly affect its performance level, allows all phases of flight to be executed within the applicable distances/areas and obstacle clearances at the planned operating mass.
Níor cheart tús a chur le heitilt nó leanúint di mura bhfágfaidh feidhmiú sceidealta an aerárthaigh, agus na fachtóirí uile a théann i bhfeidhm go mór ar a leibhéal feidhmiúlachta á gcur san áireamh, gur féidir gach céim den eitilt a dhéanamh laistigh de na hachair/na réimsí agus de na réitigh maidir le constaicí is infheidhme ag an mais oibríochta phleanáilte.