Defects and return systems to an airworthy conditions in aircraft fluid function?

From a pilot's point of view, every aircraft comes from the factory with a checklist of things to look at specifically before every flight to ensure airworthiness. It's generally called a walk-around inspection, checking flight controls for security and condition, tire condition, engine for obvious problems. propeller, fuel and oil quantities. and many other things. The walk around also includes checking to ensure all required paperwork is there including weight and balance, airworthiness certificate, aircraft registration, operator's manual. etc. I would also check the log book to verify the transponder check was done within the past 24 months and the annual or 100 hour inspection is current. From an A&P mechanic point of view much the same applies, however I would look much closer at the maintenance logs for engine and airframe.

The cost in designing, developing, and testing an aircraft is staggering!!! Defense contractors as those you mention have extremely strict regulations to follow regarding export control and no equipment is sold to a foreign government without the express approval of the US gov't.

here ya go...
http://www.explainthatstuff.com/jetengine.html
tis physics.

That would be the ground prox system on the aircraft it lets the flight crew know how far they are above the ground during an approach to the landing runway.

James,

There are navigation and softwares inside the cockpit so pilot can find easily as well as air traffic controllers will guide them so they can easily land there....
with regards,
jaijith