Off to the sim for a 4 day stint tomorrow, but it will give me unfettered access to the Airbus performance laptop (every cloud has a silver lining!).
So if I run a landing 'inflight' perf calculation at a high GW and temp for a SL airport and run it again with the same parameters for say, MAD (elev 2000') and compare the app/clb gradient, that should give some indication of the degradation of the gradient as we climb away OEI. Presumably, though, if the OAT is below the flat rated temp for the engine (ISA+30 in my case), since the thrust will stay the same, only the small increase in TAS as we climb will account for any fall off in gradient.........
............unless you know different!!
Enjoy the weekend - if you're off!
Cheers
mcdhu