engine and wing overheat detection yes, never flew one with bottles.....wing overheat could be either wheelwell, or bleed duct in leading edge.....Metro II had battery explode, causing wing explosion/separation over lake Erie USA years ago, also quite sure the Metro in Canada lost the wing very short finals and landed upside down on the runway....I had an engine fire in a metro circa 1988 which produced no indications whatsoever..airplane was new 60 hrs TT!!! fuel nozzle manifold defective weld....hope they sort this out...the recent engine change on this one might be a clue...but with gear extented I might suspect a "wing overheat" indication....