TQ MONSTER -
"It concerns me that if a serious fault is found with the 902 fleet most of the Air Ambulance aircraft in the UK will be grounded leaving great tracks of England with very limited coverage"
Not so. As AA operations in the UK use more EC135s that 902s, perhaps you should be more concerned about a serious fault with them?
"I'm reminded of a saying that goes "Never fly the 'A' model of anything"
Who is flying an "A" model? The "A" model of the Explorer was the MD900. the "B" model was the MD902 with P+W 206 engines. The current ("C") model is the MD902 with P+W 207 engines.