At 10.06pm on Monday night the Irish Air Corps received a request from the coast guard to provide top cover for a long range medical evacuation off the west coast. They replied that it was not possible to provide fixed wing aircraft cover outside of normal hours.
To be fair to the Air Corps, though, SAR and top-cover are not funded or 'primary missions' and thus are flown as-available. It doesn't appear that ICG compensates them for any missions flown, and certainly it isn't deducted from CHC's budget, so crews and aircraft aren't dedicated on stand-by.
Before this incident I had assumed that SAR was a tasking but the CASAs are primarily for maritime surveillance, medevac and personnel transport.
The Air Corps even sent the LJ45 once for top-cover, since the aircraft and crew happened to be available at Baldonnel that day.