In the previous lesson, we had understood the means of Calculating Static Air Temperature. In this lesson, let us look at an example of such calculation. FORMULA BASED CALCULATION OF SAT (COAT) RAT (IOAT) (Indicated Temperature) = -20°C Mach No = M 0.73 (Normal Cruise Speed) Recovery Factor (Kr) = 0.98 (From Flight Manual) RAT of -20°C is 253 K SAT = TAT / (1 + 0.2 Kr M²) SAT = 253 + (0.2 × 0.98 × 0.73²) => SAT = 253/ (1 + 0.1044) SAT = 253/ 1.1044 =…
Category: Flight Instruments
Aircraft are equipped with many instruments which assist pilots in safe and efficient flight operations. In this section, we will learn about the instruments used in modern aircraft.
Calculation of Static Air Temperature
In the previous lesson, we had understood about the terms used in temperature measurement. In this post, let us learn to calculate the Static Air Temperature from the Observed Temperature. FORMULA Measured Ram Rise = Total Ram Rise x Recovery Factor Measured temperature = Actual Temperature + Measured Ram Rise Ram Air Temperature = Static Air Temperature + Measured Ram Rise IOAT = COAT + Measured Ram Rise CALCULATION OF SAT Rapid formula for use in air is Ram Rise = (TAS /100)2 Accurate formula recommended in exams is SAT…
SAT-TAT-RAT
In this lesson, we will learn about the Static Air, Ram Air and Total Air Temperatures which are shortened to SAT, RAT and TAT. In our earlier post we had understood about the Errors in Temperature Measurement. STATIC AIR TEMPERATURE Static air temperature which is also called SAT is the actual temperature of undisturbed air outside the aircraft. Our aim is to measure this temperature correctly. Unfortunately, SAT cannot be obtained directly but only by correcting for errors in TAT probe. That is the reason that SAT is also called…