What Causes Emergency landing?

It is caused by the failure of or damage to vital systems such as engines, hydraulics, or landing gear, and so a landing must be attempted where a runway is needed but none is available. Ditching is the same as a forced landing, only on water.

How common are gear-up landing?

Gear-up landings happen nearly every week. Sometimes it’s due to mechanical failure, but other times it’s due to pilot error.

Can a plane take off without landing gear?

A belly landing or gear-up landing occurs when an aircraft lands without its landing gear fully extended and uses its underside, or belly, as its primary landing device. Belly landings are one of the most common types of aircraft accidents nevertheless, and are normally not fatal if executed carefully.

Can the crew go down to the landing gear area?

In these kind of situations, can the crew, or one of the pilots, go down to the landing gear area and solve the issue? On older (WWII-era) large planes, the crew had access to a manual crank to lower the gear if the automatic extension/retraction system (usually a linear actuator powered electrically) failed.

How do you unjam a retractable landing gear?

Any aircraft with retractable landing gear is required to have an alternate extension mechanism that can be used to extend it if the primary system operating the gear fails, which was already well explained by KeithS. But when that also fails, there is no way to access the gear to attempt to unjam it.

What is the best aircraft configuration for a forced landing?

The best aircraft configuration for a forced landing is a hotly debated topic, especially when it comes to landing gear position. In rough, hard terrain, putting the gear down to absorb impact energy may be advantageous.

Is it dangerous to land with partial gear on a plane?

Aircraft are designed with all sorts of emergencies in mind and even landing with partial gear is not a big deal. Sure, it will do some damage to the plane, possibly even to the point that it’s not economical to try to fix it, but that’s what insurance is for, and risk of injury is minimal.

https://www.youtube.com/watch?v=iGUs-Dmt_k0