Engineering with only AS Maths? Watch
I didnt look at any uni below the top 7, so I guess there maybe something out there. But I'm pretty sure there isnt. If he really wants to get into aeronautics he maybe better off working for Rolls Royce, BAE or the RAf after his a-levels and be employed to build and maintain the components of aircraft.
Trust me, you definitely need a minimum of A2 Maths for Aeronautics...and having Further A2 under your belt (i.e having FP1, FP2 and FP3 from Edexcel - not sure about any other boards!) would definitely be a plus, and in some cases even necessary.