International Standard Atmosphere (ISA) is a model used for the standardization of aircraft instruments. It was established, with tables of values over a range of altitudes, to provide a common reference for temperature and pressure. Flying in ISA-plus temperatures will have a negative impact on aircraft performance. If ISA-plus temperatures are excessive, aircraft may not climb at the anticipated rate and/or may be unable to maintain altitude. The following is an overview of basic information you need to know about ISA: 1. The ISA model has several components ISA is a hypothetical model – representative of an ideal atmosphere based … Continue reading International Standard Atmosphere: How It Affects Flight – Understanding the Basics