You would not answer to the name of MRF by any chance?
At that height, you have to consider the possibility of multiple sea-bird strikes and the effect on the engines. Nimrod out of Kinloss a few years ago!! Moreover, what are the potential effects of salt water contamination on the airframe and engines, will you have a wash-down facility ready for your post landing checks?
What are the handling characteristics of a 146 over long periods at such low altitudes, ie Phugoid Oscillation. Does the 146 aircraft have a rad alt? Will it need extensive modification to meet your requirements?
Frankly, stick with what you have, you know its capabilities, you know what works and all your kit has been designed for that aircraft. It is amazing how costs suddenly escalate once a contract to transfer to another airframe has been agreed.
Sorry that I appear to be a little late in replying to this thread, I am a very recent arrival to the site.
[This message has been edited by lightningmate (edited 07 October 2000).]