The environment of crew compartments must not jeopardise the crew's ability to perform their tasks and its design must be such as to avoid interference during operation and misuse of the controls.
Ní mór timpeallacht urranna na foirne a bheith socraithe ar bhealach nach gcuirfeadh as do chumas na gcomhaltaí foirne a gcuid cúraimí a chur i gcrích agus caithfidh dearadh na n-urrann a bheith déanta ar bhealach a sheachnódh aon chur isteach ar oibríochtaí agus ar mhí-úsáid na rialtán.