Questions tagged [boeing-747]

A medium- to long-range four-engine wide-body jetliner (the original "Jumbo Jet") introduced into commercial service in 1970, easily recognizable by its distinctive hump forward of the wings. Different versions typically seat between 266 and 660 passengers.

Filter by
Sorted by
Tagged with
3
votes
2answers
240 views

What would be the minimum number of engines required to climb in a 747?

There was a really good Air Crash Investigation by Nat Geo which showed the British Airways Speedbird 9 issue where volcanic ash swept over all four engines and through the air vents inside the cabin. ...
2
votes
2answers
219 views

What effect does the Space Shuttle have on the Shuttle Carrier 747

I saw a picture of this the other day and it got me thinking... How does having the shuttle on the back of the 747 affect the factors of flight? My guess is that is provides an incredible amount of ...
6
votes
1answer
268 views

Why does taxiing produce large lateral loads on the 747's engine pylons?

While reading through a bunch of old AARs recently, I found (in the context of a 1993 747 in-flight engine separation) this interesting tidbit: [...] Boeing engineers report that the modifications ...
6
votes
2answers
278 views

How are the 747-400 rudder pedals and tillers connected to the nose wheel?

The Boeing 747-400 Before Taxi Procedure says (emphasis mine): [...] Flight controls .............................................. Check C [...] Hold the nose wheel tiller during ...
15
votes
3answers
9k views

Was a six-engine 747 ever seriously considered by Boeing?

The Boeing 747 can carry a fifth engine on the side. As the airframe looks quite symmetric, I think that it would not be big work to hang a sixth engine on the side as well. From here, we seem to be ...
18
votes
1answer
2k views

What are these silver stripes on Cosmic Girl for?

Cosmic Girl (a 747-400 used for launching things into space)1 has a network of silver-coloured stripes on its empennage, starting at the (closed-off) last cabin window, and going aftward and upward ...
3
votes
1answer
210 views

What is that letter in the top of the tail of that Jumbo?

Aristotle Socrates Onasis, after marrying Ja. Kennedy, bought, from Boeing, a 742, the Olympic Eagle - now left in Hellikon Airport to rot, after the Olympic Airlines went public .. At the top of its ...
5
votes
1answer
311 views

How was the 747 in the China Airlines Flight 006 affected by the wing damage it sustained?

The passengers on China Airlines Flight 006 had a very memorable flight when the crew lost control and the aeroplane went into a high-speed dive. Various pieces of the aircraft were torn off. The ...
31
votes
8answers
8k views

Why don't B747s start takeoffs with full throttle?

Why does the 747 start takeoff with partial power and increase to full throttle later down the runway, when the A380 for example starts on full? Source This is not the same question as: Is it ...
12
votes
3answers
3k views

Does Nitrogen inside commercial airliner wheels prevent blowouts on touchdown?

I just watched the first episode of Inside Mighty Machine where civil engineer-turned-host, Chad Zdenek, discussed innovations of the 747. One innovation he discussed was the increased number of ...
1
vote
1answer
224 views

How is the center ILS used on the 747-400?

The aircraft has 3 ILS receivers, but only ILS L and R in the CDUs. How does the ILS C is put into action?
4
votes
2answers
1k views

Is it possible to buy a retired Boeing 747 aircraft?

American airline companies landed their last passenger 747 jet into retirement last year citing higher costs of flying this aircraft in comparison to modern widebody twin-engine aircraft designed for ...
1
vote
2answers
412 views

Why do the B747 of NASA Shuttle Carrier Aircrafts (SCAs) need additional vertical stabilizer?

Here is picture of B747 SCA of NASA and the AN-225 SCA. There are additional vertical stabilizer in the tip of the elevator to the Boeing's, while the AN-225 is designed with the vertical stabilizer ...
-4
votes
1answer
259 views

How many B747s SCA does NASA have?

How many B747s that used as Shuttle Carrier Aircraft (SCA) does NASA have? Please include: The number of B747 SCAs that are still in service. The number of B747 SCAs that have already been retired (...
8
votes
3answers
942 views

What is the weight of the fuselage (only) of the Boeing 747?

I'm wondering about the weight of the Boeing 747's fuselage.
43
votes
3answers
7k views

Was the Space Shuttle aerodynamically neutral while piggybacking, or did the combination act like a giant biplane?

Trying to investigate this question, I see that 'Ask the Captain' says: The weight of the shuttle is calculated like any payload. The 747 produces enough lift to fly and to carry the weight of ...
8
votes
2answers
1k views

Can an Airbus A380 or Boeing B747 fly with only 2 engines?

What would happen if, during cruise at a high gross weight, one of these airplanes suffered a double engine failure: With one failed engine on each side (leaving one working engine on each wing)? ...
7
votes
0answers
416 views

Why are the cabin chimes one semitone lower on the Boeing 747-400 than on other aircraft? [closed]

I noticed that the cabin chimes on the Boeing 747-400 overall sound one semitone lower than on other aircraft, including the 737, 777, Airbus A320, and even the 747-8. The same semitone-lower chimes ...
3
votes
1answer
2k views

Is this “wing-wave” early after takeoff really a pilot tradition?

I saw this video of a "wing-wave" immediately after takeoff of a 747-8 pop up on my Instagram feed. In the description, someone says that their friend is the pilot and that he did it to wave goodbye ...
6
votes
1answer
670 views

What are the consequences of attaching an unused extra engine under Boeing 747 wing?

It turns out Boeing 747 can carry an extra engine under its left wing in case there's need to transport an engine somewhere far away. The engine is attached between the body and the left inner engine ...
3
votes
1answer
649 views

What is the structural significance of 'dimples' on the fuselage of a Boeing 747?

I recently watched the following video: In the video there is a mention that there are 'dimples' visible on the fuselage of a Boeing 747, when it is on the ground. It ...
6
votes
2answers
1k views

What material is used for the floor panels in the main cabin for Boeing 747-400?

Just conducting some research into materials used in construction for Boeing 747-400 and Douglas DC-3. I just found out that in a DC-3 the floor panels in the main cabin and companionway are of ...
4
votes
1answer
294 views

What's the name for the structure that helps stop the nose wheel in Boeing 747-400?

From my understanding the nose wheel of a Boeing 747 does not have brakes, and as such when it is retracted it is still spinning. However, there are two "plates" that make contact with the wheels and ...
6
votes
2answers
476 views

What is the wingtip station number on a Boeing 747?

In the figure we can see the station line even though it is not clear. I'am using that picture just for an example to make the question clearer. Main question What is the station number for wingtip ...
38
votes
1answer
7k views

Why don't El Al 747's stay at the gates at JFK?

I was recently travelling through JFK in New York City and saw the El Al 747, presumably arrived as ELY1 and departing as ELY4, sitting on the apron near terminal 4. What I saw was similar to as shown ...
4
votes
2answers
1k views

Which aluminium alloy is used in the Boeing 747's fuselage?

Which aluminium alloy is used in the Boeing 747's fuselage?
3
votes
2answers
415 views

Why the 747 testing GE-9X doesnt have a winglet?

News says it is a 747-400, but it doesn't have a winglet.
-2
votes
1answer
531 views

What is the weight of the bulletproof cockpit doors of a Boeing 747?

What is the weight of the bulletproof cockpit doors of a Boeing 747 built prior to 9/11? Do the doors weigh the same for later models, like the Boeing 747-8 specifically? How many fewer passengers do ...
3
votes
3answers
2k views

Why are the largest civilian aircraft not adapted for military use?

Frequently, civilian aircraft models are militarized, e.g. into the role of tankers, AWACS and others. In this militarization, we see a lot of "medium-large" aircraft, such as B707, A330. The super-...
5
votes
1answer
688 views

What is the air temperature inside of a tire right after landing?

What is the maximum design air temperature inside of a tyre of an Airbus A380's and a Boeing 747-800's main gear fitted with brakes, before landing after a 10 hour flight and right after landing? Are ...
4
votes
2answers
2k views

Why do pilots cut the reverse thrust below 40 km/h?

In a Microsoft Flight Simulator 2004 Boeing 747 landing tutorial, it was said to cut the reverse thrust after decelerating to 40 km/h. What happens if that was ignored all the way to a complete stop? ...
31
votes
6answers
19k views

Are there any Boeing 747 still flying for commercial use?

No American airline flies it anymore, but the Jumbo has been mythic for decades: ANA B747-400. Wikimedia, photo by Kentaro Iemoto Is it still possible for a passenger to board a Jumbo Jet? Which ...
7
votes
2answers
3k views

What is the maximum G load a 747 can withstand during an emergency course reversal?

In an emergency course reversal, passenger safety first priority, to avoid say, a column of ash from a new volcano, what it the most G a 747 can withstand with an average passenger complement?
14
votes
2answers
2k views

Why were the 747SP's trailing-edge flaps so much different than those of the -100/-200?

I read several decades ago about how the 747SP's trailing edge flaps were substantially redesigned from those of the "original" 747-100/-200s. The images on the 747SP Wikipedia page clearly show what ...
14
votes
3answers
1k views

Why are the outboard Krueger Flaps retracted before the others on the B747?

In this video, I noticed that the outboard Krueger Flaps on this Boeing 747 were retracted while the middle and inner sets remained extended (refer to 3:22 - 3:30 in the video). My questions are: ...
1
vote
0answers
120 views

Is there any reason spoilers would deploy just after liftoff? [duplicate]

I was watching this video of a 747-8F taking off. http://www.dailymotion.com/video/x273atd Just after liftoff the air brakes and ground spoilers deploy on the left wing causing a sharp roll to the ...
0
votes
0answers
81 views

Do airliners perform a dive maneuver to reduce altitude [duplicate]

DO airliners, jumbos included, like the Airbus A380 and Boeing 747 routinely perform dive (nose down) maneuvers to descend or do they rather reduce speed and descend with the nose up? If not, why not?
8
votes
2answers
2k views

What's an estimate for the cost of the cockpit technology on a 747 or 777?

Can anyone share what the percentage cost or dollar costs of cockpit instruments and related software is within a 747 or 777? PS- I'm a physician working in medical safety. Physicians can no longer ...
9
votes
2answers
7k views

How can a Boeing 747 take off from Princess Juliana 7,546 ft runway?

I recently read this article that talks about 747s taking off from Princess Juliana International Airport in Sint Maarten. The Princess Juliana runway is only 7,546 ft, but according to Wikipedia, ...
3
votes
1answer
2k views

What is the speed record for the Boeing 747 and Airbus A380?

What are the speed records (true air speed) of these Jumbos: The Boeing 747-8 and the Airbus A380 if any?
22
votes
3answers
5k views

What happens when disengaging the electricity generators on a B747?

This answer says: If let's say, you [...] disengage the electricity generator of every engine (which cannot be re-engaged without mechanical maintenance), [...]. What exactly happens in the ...
6
votes
1answer
1k views

What would happen if the flight engineer is unavailable on a 747?

Consider a 747-100/200 with a 3 person crew: two pilots and one flight engineer. During the flight, the flight engineer suffers a medical problem and is unable to serve duty for the rest of the flight....
6
votes
2answers
905 views

Could the Boeing 747's 'hump' be improved aerodynamically?

Couldn't the Boeing 747's aerodynamics be improved by extending the hump further back, or sloping it back more gently? Wouldn't this make it more aerodynamic and therefore fuel efficient and faster?
1
vote
1answer
593 views

Why hasn't Boeing updated the 747 with technology from the 787?

Why hasn't Boeing updated the 747 with technology/designs from the 787 Dreamliner? Surely this would be a very successful aircraft as it could have the best of both designs. Has Boeing explained why? ...
5
votes
2answers
2k views

How did the 747SR fly from Qatar to London?

The following photo on the Boeing 747 Wikipedia article reads: Qatar Airways 747SR-81 landing at London Gatwick Airport in 1996. How did the 747SR manage this flight [on a regular basis]? The only ...
23
votes
4answers
12k views

What is the reasoning behind using depleted uranium as counterweights in the 747?

I recently found out that some of the earlier models of 747 had between 600 and 1100lbs of depleted uranium as counterweights. These counterweights were found in 747s manufactured between 1968 and ...
9
votes
2answers
2k views

What are these two holes on the forward fuselage of a Boeing 747?

Does anyone know what are the two holes are on the Boeing 747, on the left forward part of the fuselage? Source: airliners.net I guess the right hole is the E/E compartment smoke override valve, is ...
9
votes
1answer
536 views

Could the filming of the 747 in “Awakenings” have taken place during the 747 flight testing?

In the 1990 film "Awakenings", the main character Leonard awakens after suffering from a catatonic illness for 30 years. There's a scene where Leonard watches a 747 landing in New York at JFK. This ...
7
votes
1answer
1k views

How does the Boeing 747 smoke evacuation work?

(source, inset source) I recently watched Mayday's dramatization of UPS Airlines Flight 6. Then I recalled the Boeing 747 having a SMOKE EVAC handle. How does ...
29
votes
2answers
11k views

Where does Air Force One refuel?

Obama came to Greece and then to Germany. That's a long trip, even for the majestic Jumbo. There was a lot of discussion about where the aircraft was refuelled during that trip. Do we know, in general,...