No question of the FISO passing instructions to an aircraft in the air!
When the conditions which allow ATC to issue a 'land after' exist at an AFIS site, in order to avoid unnecessary go-arounds it would be useful if the FISO could say something like 'one about to vacate, land at your discretion'.
The fundamental rule being one on the runway at a time, if an aircraft has reported 'final' and there is still one on the runway, all the FISO can say at present is 'the runway is occupied', hence it is up to the pilot to decide whether to go-around straight away or continue in the hope the runway will be clear before he touches down.
The FISO should have a good enough view of the runway to be able to judge if the first aircraft will vacate before the second has to decide whether to go-around, hence the advice of the FISO will assist the pilot in making this decision.
NB: If the pilot of the second aircraft elects to continue and lands without a 'land at your discretion', the official view of SARG is that this requires an MOR to be raised.
Last edited by chevvron; 17th May 2015 at 17:47.