boac, minuteman- so thats two possibilities- the packs not running for long enough or the heat supplied to anti-ice the TAT probe not dissipating and causing heating upto 99deg.
TAT= SAT + Ram Rise, Why would one want to heat the TAT probe without a check, that it does not accurately indicate the OAT. My car indicates the OAT fairly accurately... and it does'nt cost anywhere close to 60 Million.....
Another thought, - the Take off page on the FMC get a OAT input from the TAT probe, which need not be hard selected or overwritten with another valu- based on this the Toff N1 is displayed- this reading wouldnt be accurate if the TAT went to 99 degrees or would it ???????????