How many landing gear wheels does a Boeing 747-400 have?
four wheels
The 747 has redundant structures along with four redundant hydraulic systems and four main landing gears each with four wheels; these provide a good spread of support on the ground and safety in case of tire blow-outs.
How many landing gears does a 747 have?
four
While most commercial aircraft today operate with two or three main landing gears, the Boeing 747 is one of a small number of aircraft to use four. We explore precisely why the 747 was designed with four main landing gears.
How tall is the landing gear on a 747?
1.75 meters
This info is from the 747-8 Airplane Characteristics for Airport Planning document by Boeing. Here, ‘E’ gives the height of the (main) landing gear attached to the fuselage. So the landing gears height is 1.75 meters.
What is the 747 on top gear?
The aircraft you see in the background of Top Gear episodes is in fact a Boeing 747, specifically a former British Airways -200 series variant registered G-BDXJ (c/n 21831). The 40-year-old airframe is currently owned by Aces High Limited, who use it for filming and specialist training exercises.
How many landings can tires withstand?
The typical airliner tire can handle a 38-ton load. It can meet the ground 500 times before needing a re-tread, a refresh it can take on seven times in its life. A Boeing 777 uses 14 tires, Airbus’ A380 carries 22, and the enormous Antonov An-225 demands 32.
What happens if a plane’s landing gear doesn’t come down?
When an aircraft is unable to touch down with its landing gear fully extended it must perform a gear-up or “belly” landing. Such a landing does carry a small risk – there is likely to be damage to the aircraft; it could conceivably catch fire or flip over if it lands too hard.
Why does a 737 have no landing gear?
Since the plane was deliberately designed to be low, there wasn’t enough space under the aircraft to accommodate wheel well doors for the main landing gear. If implemented, the doors will likely come in contact with the runway, taxiway or apron surface should they be deployed on the ground.
Can a plane fly with its landing gear down?
All airplanes do not have to retract their gear; many planes are fixed-gear, and cannot retract gear. Some planes retract their gear. Planes can leave their gear deployed all through flight, provided they remain slow enough that the extra airflow drag doesn’t damage the airplane and landing gear.
Do planes need new tires after every landing?
Tires are changed every 120 to 400 landings depending on a number of factors. Aircraft tires need to withstand an extremely wide range of temperatures that go from minus 60 degrees Celsius at an altitude of 10,000 meters to extremely high temperatures when landing in the world’s hottest regions.
How long do tires last on a Boeing 747?
about 200-250
I’ve heard that airliners’ tires will last about 200-250 depending on how many hard landings are made. Bizjet tires will last longer, and light aircraft tires will last indefinitely, depending on how gentle you are and what kind of surface you’re landing on.
Can pilots forget to lower landing?
Pilots who ritually perform such checklists before landing are less likely to land gear-up. However, some pilots neglect these checklists and perform the tasks by memory, increasing the chances of forgetting to lower the landing gear.
What do pilots do if landing gear fails?
However, if the gear does fail to deploy, pilots are well practised in how to handle the situation. By going through in-depth checklists and procedures, we can set the aircraft up for a non-normal landing which may not even require an emergency evacuation.
What happens if a landing gear fails?
How strong is a 747 engine?
Early jet engines Boeing’s first 747 jumbo had much bigger engines which produced about 45,000lbs of thrust. The most recent model, the 747-8, has engines that produce 66,000lbs of thrust.