Your Best explanations please
 

I'd like the best explanations/definitions on the following from some of the boffins here pls

Redefined Thrust,

TAT,

SAT,

Slippery,wet,contaminated runway,

What factors you take into account for descent planning (specifics for the 747-300) and how accurate it turns out or is it a waste of time since you will more than likely get told when to go down anyway?

Turbine Case Cooling,

Why 7R4G2 engines develop the rumble above FL250/320kts if you reduce thrust to idle?

How a cost factor of around 120-130 (scale 0-400) would fit into the speed ranges of MRC, LRC, ViMD?

Thanks

He actuator i can give you some answers but check out this website:www.monmouth.com/~jsd/how/.

Let me know if you find the answers.