Airplanes are not life limited, but i think a Cessna 172 need's an airframe overhaul every 100,000 flight hours.
This is rather confusing; every plane under goes stresses as part of it's take off and landing and it's flight.
Every plane has a flight envelope, which if you go beyond will likely overstress the airframe and possibly cause it to break apart.
The more a plane is used the more these stresses add up and the more likely bad things are to happen. For example: Forest fighters use planes that are no longer in the Air Force inventory because of their age. Some years ago one of those planes (a C-130) lost its entire port wing in level flight while dumping it's load over a fire.
Eventually the maintenance required for a plane to remain airborne will exceed the plane's worth to it's owner. Especially if you can't find the parts for it anymore.
Semi-Monocoque
No. The Cessna 172 is a single engine aircraft. It has a 4 seat cabin.
The Cessna 172 Skyhawk is a small light aircraft first flown in 1955. Images of the Cessna 172 Skyhawk can be found on line and in aircraft industry literature.
Cessna
The Cessna 172 has slotted flaps.
The ceiling height of a Cessna 172 is 13,500 ft. The optimum altitude for maximum range is 12,000 ft.
Cessna Aircraft model 172 or C-172 for short.
Not without a pilot
$269,500
The ceiling height of a Cessna 172 is 13,500 ft. The optimum altitude for maximum range is 12,000 ft.
Skyhawk is the name given to the Cessna 172. The 180 has a more powerful engine, variable speed prop, and is slightly larger than the 172. The biggest visual difference is the landing gear. The cessna 180 is a tail dragger while the 172 has tricycle gear.
If you mean, "What is the Vne (Never Exceed Speed) of a Cessna 172?" the answer is 163 KIAS. KIAS means Knots Indicated Air Speed.