>> What is RAC in this context?
TCAS resolution advisory complement.
It's part of the coordination between two conflicting aircraft. Once a solution is computed the TCAS systems will send advice to the other aircraft to minimise the risk of collision. The Resolution Advisory is something like "I WILL CLIMB", "I WILL DESCEND". "I WILL LEVEL OFF", and the complement is a component that says "DON'T PASS ABOVE ME" or "DON'T PASS BELOW ME".
Not surprising the Biggles would be unable to comply with a TCAS instruction.
I did have to look up this aspect of it though.
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