What is the difference between indicated altitude, True altitude and all the others??

Answer 1

By all the others I assume you mean Pressure Altitude, Density Altitude and Absolute altitude.

Indicated altitude is read directly from the altimeter when the local pressure setting is set into the Kollsman window.( known as QNH)

True Altitude is how high the airplane is above sea level. It is known as MSL ( Mean Sea Level) True altitude is important because on charts, the height of mountains etc in in MSL.

Pressure Altitude is the altitude indicated when the Kollsman windows setting is 29.92 in-hg. This is altitude above the standard datum plane. This is an imaginary line where air pressure is 29.92 in-hg. It can either be above or below sea level and it is corrected to 15 degrees C. This altitude is used for aircraft separation purposes above 18,000ft.

Absolute altitude is simply the height of the airplane above terrain or Ground level. It is known as AGL. For example if you are flying at 5,000MSL( above the sea) and go over mountains that are 4,000ft high, your absolute altitude will be 1,000ft.

Density altitude is pressure altitude that is corrected for non standard temperatures. When temperatures are standard 15C ( 59F) Density and pressure altitude are the same. If the temp is above 15C the density altitude is higher than pressure altitude. If below 15C the density altitude is lower than Pressure altitude. Pressure altitude is not used to measure height but to determine of aircraft performance.

Answer 2

Absolute Altitude

Answer 3

This Site Might Help You.

RE:
What is the difference between indicated altitude, True altitude and all the others??

Answer 4

True Altitude

Answer 5

Indicated altitude is what you see on your altimeter. Think of it as how high you THINK you are.

True altitude is your "true" MSL altitude. This is how high you REALLY are above sea level. This is where the "high to low, look out below" saying comes into play. If your altimeter is incorrectly set (i.e. incorrect sea level pressure set in the Kollsman window) you will obviously be at an incorrect altitude. What many pilots don't realize is the same thing holds true for temperature. I fly in Wisconsin and, as everyone knows, it gets damn cold up north in the winter. On a cold winter day you can have your altimeter set correctly and still be flying several hundred feet lower than the altitude displayed on your altimeter. This is why indicated altitude and true altitude are not always the same.

Pressure altitude is simply how high you are above the 29.92 "standard day" reference. In the US we use pressure altitude above 18,000 feet because at this altitude terrain avoidance is not an issue - only aircraft separation. If everyone's altimeter is set the same it makes this much easier. This, by the way, is the reason we refer to altitudes at/above 18,000 feet as "flight levels" (i.e. FL200 instead of 20,000 feet).

Density altitude is strictly a performance measure and is defined as pressure altitude corrected for temperature. Think of it as how high the AIRPLANE thinks it is. On a very hot day when the air is extremely thin you may actually be at a pressure altitude of 1,000 feet but to the airplane it may feel like 2,000 feet. The reason for this is that there are fewer oxygen molecules to burn in a given volume of air so engines produce less power. Aerodynamically, the wings don't like the thin air either.

Answer 6

Good marks for charles again. Nothing to add so I'll just say that the most useless things to pilots are the altitude above them, the runway behind them and the fuel they left in the truck.

Answer 7

For the best answers, search on this site https://shorturl.im/7Pvtn

If you tried to fly a plane based on true airspeed, all your aviation decisions would be incorrect. You wouldn't know when it was safe to extend your landing gear. You wouldn't know if your approach speed provided an adequate stall margin. You wouldn't know if you were above or below the speed at which you can safely use full control deflections. For purposes of aviation, it is the indicated airspeed that matters. What matters is how many air molecules are bashing into the plane per second, not its speed relative to the ground or the air mass.

Answer 8

The question has been answered perfectly and in full detail. Any further attempts at answering would be mere repitition.