When flying an aircraft like helicopters or airplanes ,to avoid heat seeking missiles
you just have to turn off the engine and problem solved!
A correct answer not mislead by Hollywood:There are three ways that are commonly used to avoid heat seeker's.1330m
Dodge it...
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Aircraft climb when they start flying and decend when they land. This is usually at a very small rate ( to avoid upsetting the passengers). If you are talking about an aircraft landing then 500 feet per minute is about right
The Soviets (Russians) removed their missiles from Cuba.
When aircraft are flying it is important that they do not fly into one another. To help avoid this flight paths for aircraft going in opposite directions are separated one form another and each aircraft is separated from those above, below, behind and in front by a 'box' of air this is the separation of air craft.
above and upwind from the heavy aircraft.
You can, if you know where and when to look. Generally aviation rules enforce a minimum separation between aircraft on the same flight level. Generally the separation (controlled airspace) for aircraft flying the same direction at the same level is 5 nautical miles (9.3 km). That distance means that the other aircraft will be hard to see (appears like a small dot). Often when flying you do see other aircraft crossing at + or - 1000 feet.... If you can see another aircraft at the same level, this is not generally a good thing... Under visual flight rules, planes must only remain well clear of each other, so you may see another aeroplane if you are in a small plane flying outside of Controlled areas.. your pilot's prime job is to see these planes and avoid them.
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To avoid accidents when the airplane is landing.
There will be no apparent relative motion between your aircraft and the other aircraft. The radar readings should enable the pilots to avoid a collision between aircrafts.
by flying away fast as possible.