2.2.1
Frequent Likely to occur often
during the operational life of a particular craft.
2.2.2
Reasonably Probable Unlikely
to occur often but which may occur several times during the total
operational life of a particular craft.
2.2.3
Recurrent A term embracing
the total range of Frequent and Reasonably Probable.
2.2.4
Remote Unlikely to occur to
every craft but may occur to a few craft of a type over the total
operational life of a number of craft of the same type.
2.2.5
Extremely Remote Unlikely to
occur when considering the total operational life of a number of craft
of the type, but nevertheless has to be considered as being possible.
2.2.6
Extremely Improbable So Extremely
Remote that it does not have to be considered as possible to occur.