The assumptions about the system that guided and bounded the recommendations include: the system will have a human centered design based on the 'lessons learned' from past systems; the system is not intended to replace the Ground Proximity Warning System (GPWS) function; the system is an on-board system that is not dependent on ground systems (except possibly navigation sensors) for operation; the system is intended to be used for terrain separation rather than navigation; there will be pilot in the loop/manual involvement in any flight path changes; information will be accessible by all flight crew members; the system will be based on the English language, but other languages may have to be considered; the system will address all fixed wing airplane types; the system will be operational full time in all flight phases; and the system will meet harmonized certification requirements.
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