When the RAD 43/47 and AD INST 9 tests with the Avionics LAME, who had the very latest boxes of freshly calibrated certified gear.
You don't think for a minute I make this stuff up now do you?
The TSO'd altimeter was pretty good, and well within IFR requirements all the way to 20K' but the D100/180 was dead on.
I have been to the factory and seen how they calibrate them, its hardly surprising.
