Cold temperatures negatively affect altimeter accuracy, causing them to indicate a higher altitude than actual, which reduces obstacle protection on instrument procedures. While cold, dense air ...

Altimeters measure pressure, not true altitude, and are calibrated to a standard atmosphere (ISA); real-world variations in pressure and temperature inherently cause indicated altitude to differ from ...

Old airplane altimeters are now the main focus of the Federal Aviation Administration (FAA). The aviation department announced that it is urging airlines to replace their aircraft's old altimeters ...