Owner or operator.
All certified airworthy aircraft engines have data plates attached that gives all the identifying info. If the plate is missing, the engine is not legally airworthy no matter what the actual condition.
owner or operator.
Any aircraft can fly as long as it can produce enough lift from the wings to overcome the weight. Additional to that the aircraft needs to be of airworthy status
Yes, but it is not airworthy until it has been checked and certified by a licensed A&P mechanic (Airframe & Powerplant).
Short answer, no. If it's for static display, you can do whatever you want. If it's going to remain airworthy, the parts need to be both correct and certified as airworthy. At least in Canada... Uncertified(non-aviation) parts have brought down many aircraft, especially automotive hose clamps.
As many times as it can, as long as it remains airworthy. Small Cessna aircraft are often used as primary trainer aircraft and as such, they can land and take off again several times per hour.
Airworthy
Airworthy.
A MEL is used to defer inoperative equipment not missing equipment. To deal with missing equipment there is a Configuration Deviation List. A Configuration Deviation List (CDL) is a list of non-structural elements that may be missing from an aircraft and the aircraft is still considered airworthy
two
In the past, some movie makers have bought models (say, 1/27th size replicas) of classified aircraft, then enlarged the parts to construct a full-sized (not airworthy) imitation.