International Standard Atmosphere – ISA

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Today we will talk about the importance in aviationón de la International Standard Atmosphere – ISA or Atmósfera Eastáinternational.

Post written by: William Casalins
Aeron Engineeráuseful
Foundationón SON

A boy of about 20 años, short hair, impeccably dressed in a chair in a roomónumber of classes at an aviation schoolón, asks a veteran professor who movedíOrondo in the middle of the class explaining his aerodynamics subjectámica

• Teacher, please, dígame the truth ¿Becauseé He tries so hard to explain to us about ISA, it's really so important? It would seem máIt's a filler topic, but you insist very much that it be resolved with such exactness.
• Mijo, It is obvious that you think that there are much moreás important for an aviator, like engines, flight controls, meteorologistíto or navigateón, maybe soí sea, but soon you will remember your teacherísica when I tell youía: “pears with pears and apples with apples”.
• I don't understand teacher.
• Suppose there is a fáaircraft factory in Quito and one in Guayaquil, are you going to buy an avión for the company and you fly the one from Quito first, take out 4 tons in a good rémoan of promotion. Then you are going to fly the one in Guayaquil with very similar price and dimensions. comes out plenty with 5 tons, ¿cuábuy itías?
• The one from Guayaquil, undoubtedly
• Ok, You move to your base in Quito and tell your boss very proud that you bought the best airplaneón and this one congratulates you
• You arrive in the middle ofíYou are going to make your first flight from your base and you realize to your horror that your magnificent planeón doesn't even take out the 4 tons of the other and that the rise is más very precarious, ¿you think i cheated on youñto?
• Or something bad happens to the avión

No, to the aviónothing happens to him, tú you yourself saw how the d behavedíbecause they gave it to you in the fábrica ¿what could have happened?

• Well we all know that the avión between más high yields less
• And then ¿because you failed in the comparisonón and you bought the avión with fewer features; you compared pears with pears and apples with apples?
• Sí, that depends on the elevationón and field temperature.
• And other thingsás, but ¿cóI can travelíso you know in advance that this was going to happen and that you are judging pears with pears? Ahí This is when you realize the importance of standardizing things and in particular the performance of the aircraft.ón, You can know it in advance just by looking at the file téconical and without even needing to fly it, you can interpret the performance curves anywhere in the world and be able to compare with the othersás aircraft.

There are many factors that influence the performance of an aircraft.ón, not just the height, spaghettién humidity and temperature and in the paíIn countries that have seasons, uncertainty can be worse than in countriesíits tropical, in a élittle at sea level you can be less 5 and in another to meás 35 degrees centítemperature degrees and performance is extremely different, The densities affect a lot and can also fool you.én a good takeoff from a cr airportítico.

Then the engineers give you the tables and youú, if you took advantage of the class, will not haveás hesitation in pulling the exact load on a given runway regardless of weather conditions or geography.íto the place.

• I mean, teacher ¿That can prevent me from having an accident.?
• Yes and a premature dismissal tooén for choosing the avión wrong.

Student and teacher finish the comment with smiles and convinced that it was the best question of the day.ía.

Professor Omar Gonzales, he realizes that he isán in a EUREKA moment of effervescence and heat, and the condemned man does not plan to waste it; rápidamente se acerca al tablero y dice: la ISA no es la clase de hoy, pero ahora mismo se van a dar cuenta de la importancia que tiene.

Muestra una tabla de la altura optima de un avión con diferentes desviaciones de ISA y hace un par de garabatos en la pizarra.

• ¿see the difference?
• Todos dicen que sí, es obvia.
• Bueno ya sabemos que es obvia, ahora veamos cómo encontramos la desviación para poder explicar la tabla.

East ámos en Bogotá what isá a más the least 8000 pies de elevación

Sayún I.S.A. dutyíamos estar a -1 grado centígrado, pero en el termómetro de la torre dice 9 degrees, then, ¿cuál es la desviación?

• 10 degrees centígrados dijeron todos al unísono.
• Correct, then ¿thaté tabla vamos a usar?
• ISA más 10, ¿ven que sí sirve?

Pero en otra hora del día el termómetro del bogotano dice -6 degrees centídegrees ¿cuál es la desviación en ese momento?

• Menos 5 Celsius degrees

Todos en coro dijeron.

• Exact, y en vuelo se hace de la misma manera. Así es como los aviadores de antes podían cruzar el charco sin que se les acabara la gasolina en el intento.

It is artículo es dedicado a los abnegados profesores aeronáuticos que día a día entregan sus conocimientos y sus experiencias a la nueva generación de aviadores que ya no tragan entero, la competencia es grande puesto que hay infinidades de videos y simuladores, el profesor se ve obligado a estudiar más y mostrar su experticia ante los nuevos retos que estos muchachos le imprimen a la clase.