Biggus,
it is nevertheless a FACT....
Not any more my old china. HQ Air have declared that we do not do long-range airborne SAR full stop. For a variety of reasons that I won't go into but the capability no longer exists.
Options are to ask allies for help (a mitigation factor for removal of the MRA4) if you need an airborne requirement or alternatively, adopt the 'Titanic' approach and ask the nearest ship you can find from AIS to go and investigate.