With respect to the single failure criterion above, it is accepted that due allowance must be made for the size and broad configuration of the aircraft and that this may prevent this single failure criterion from being met for some parts and some systems on helicopters and small aeroplanes.
V zvezi z zgornjimi merili glede ene same odpovedi se dopustijo ustrezni popravki glede velikosti in obsega konstrukcije zrakoplova, zaradi česar lahko pride do neskladnost nekaterih delov in sistemov helikopterjev in manjših letal z merili glede ene same odpovedi.