*** Posted by run ***
[Questions:
1) what are the definitions of:
Service Ceiling, Combat Ceiling, Absolute Celing of a fighter a/c ?
2)The same for:
Internal fuel, standard fuel.

thanks for your answers
Zvika]
Hi Zvika

When it comes to defining how high an aircraft can fly you use the term ceiling. The division into three different ceilings I've never seen before and I am likely to think it's just different words for the same thing, but I really don't know. If they are different I have a guess on how the difference may be:
Most new fighters are capable of climbing above 50.000', but that altitude is set as the combat ceiling because the pilot doesn't wear a pressure suit, and if he lost his cabinpressure he would be in trouble. So maybe absolute ceiling is the max the aircraft could fly disregarding pilot safety.

Internal fuel is the amount of fuel you can have within your aircraft. A lot of times aircraft will carry external tanks aswell.

I haven't heard the term Standard fuel.

Regards RUN