Talk:Service ceiling
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Jepp defines it as the pressure altitude instead of the density altitude where you can only do 100fpm. Density altitude would make sense, but not sure.... Any thoughts?
Jepp notes that if a service ceiling is presented in terms of pressure altitude, it must be corrected for nonstandard temperature and humidity - which is equivalent to a density altitude conversion. From an aerodynamic standpoint, density altitude is all that matters unless you have some sort of intake charge cooling system such as a relatively complex intercooler system.