Under cold weather condition，the atmospheric condition is different from ISA condition. ADIRS calculation is based on the barometric pressure and ISA parameters. When the atmospheric condition is different from ISA, the altitude、FPA and the indications on
Under cold weather condition，the atmospheric condition is different from ISA condition. ADIRS calculation is based on the barometric pressure and ISA parameters. When the atmospheric condition is different from ISA, the altitude、FPA and the indications on PFD(altitude and VDEV etc.) are inaccurate.
