The systems to be subject to a more detailed FMEA investigation
at this stage shall include all those that have failed the system
FMEA and may include those that have a very important influence on
the safety of the craft and its occupants and which require an investigation
at a deeper level than that undertaken in the system functional failure
analysis. These systems are often those which have been specifically
designed or adapted for the craft, such as the craft's electrical
and hydraulic systems.