Jonty
Which aircraft are we talking about ? 757 I assume.
The two mysterious doors on the r/h side of the nose are the negative pressure relief valves which prevent cabin pressure from becoming less than ambient in the event of an emergency decent ( perish the thought ! )
The negative relief doors are spring loaded closed and open on the negative cabin pressure of - 0.75 psi thereby preventing the airframe squishing itself.
As for the dual TAT ? I think I'll have to do a bit of research on that one !
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Fools rush in where Angels fear to tread
[This message has been edited by Golden Rivet (edited 03 March 2001).]