Winter operations, contaminated runway takeoff, runway limited, braking action medium-poor, hydraulic failure affecting flaps and/or brakes => departure runway to short for return with given malfunction => diversion to suitable longer runway further away
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B737: PMC/EEC failure on eng => switch off PMC/EEC on both engines,
later eng fail on same engine in cruise => do you reverse PMC to ON on remaining operating fully functional other engine that never had a problem or do you continue to operate the only remaining engine on reduced margins?
Combine with high terrain (crossing Alps GVA - MXP?) for drift down procedure.
=> System knowledge and apply procedure for situation where no checklist exists