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Questions tagged [boeing-737]

A short- to medium-range twinjet narrow-body airliner, originally introduced in 1968. With over 10,500 aircraft delivered and over 4500 on order, the Boeing 737 is the most popular commercial jetliner in history.

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Why does the landing gear control have 3 positions (up/down/off) on Boeing 737-800?

I've noticed that Boeing 737-800's cockpit has a 3-position landing gear lever. During takeoff, the pilot moves the lever from DOWN to UP and then to OFF position. What's the point of the OFF position?...
Claudi's user avatar
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51 votes
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What is the technique or procedure to disable/disengage the MCAS on Boeing 737 Max 8 & 9 Aircraft?

What is the technique or procedure to disable the MCAS and manually fly the Boeing 737 MAX 8/9 Aircraft? To clarify my question, what I'm asking is can the pilot disengage the MCAS and if so, how do ...
Devil07's user avatar
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49 votes
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Why are the Boeing 737 nacelles odd shaped?

Why is a Boeing 737 NG engine not completely round in shape? It seems to be flat at the bottom and round at the top and sides. Earlier Boeing 737 versions (100 and 200) seem to have a more rounded ...
Srikanth's user avatar
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48 votes
3 answers
34k views

What is this flange on the engine?

Flying home from the Denver ComiCon, on a 737, I saw an angled flange on the engine. Could you describe its purpose? Photos by CGCampbell licensed CC0
CGCampbell's user avatar
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41 votes
2 answers
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How did NASA Langley end up with the first 737?

This answer shows N515NA, CN/MSN: 19437 as an early 737, and mentions that it may be the first one. Was this a special design built for NASA, or perhaps a prototype that nobody wanted for commercial ...
uhoh's user avatar
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41 votes
2 answers
18k views

What are these five indicators at the front of the 737 passenger cabin?

As a passenger I noticed a set of five indicators on the ceiling at the front of the 737 passenger cabin. They are red, yellow (or white), blue, white, red. The red ones seem to be coupled together (...
miroxlav's user avatar
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37 votes
8 answers
37k views

How safe is the Boeing 737-800 in high winds?

I'm not good with flying. However, on Wednesday morning I'm flying from Gatwick to Bergen, Norway, traveling alone with two young children. I'm trying desperately to not show my kids how afraid I am ...
E. D. Huckerby's user avatar
37 votes
5 answers
6k views

Why evacuate wing at the front side after water landing?

When looking at the following Transavia B737 safety cards, I noticed that after a water landing, passengers who evacuate via the overwing exits should leave the wing at the front, while during ...
Jordy's user avatar
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35 votes
1 answer
8k views

What exactly happened in this bird strike incident?

This Boeing 737 was hit by a bird and continued all the way to its final destination, from Prague to Las Palmas. What actually happened here? Was the incident considered a bird strike or an engine ...
Uraflight's user avatar
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35 votes
1 answer
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What is the strange object on 737-800 exterior, on the aft right side?

I was unable to locate this on a "real life" picture of the aircraft, so have attached an image from my simulator. What is the function/purpose of this object on the exterior of the 738? It seems like ...
sdr981's user avatar
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34 votes
6 answers
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Why does the Boeing 737 have 5 x the passenger fatalities of the Airbus 320?

I thought I'd compare the accident rates of these two similar, competing, very successful aircraft. ...
RedGrittyBrick's user avatar
31 votes
2 answers
7k views

What exactly did this mechanic sabotage on the American Airlines 737, and how dangerous was it?

An American Airlines mechanic sabotaged a 737 in Miami An American Airlines mechanic accused of sabotaging a navigation system on a flight with 150 people aboard at Miami International Airport was ...
Machavity's user avatar
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30 votes
6 answers
5k views

Why isn't the wing span of a certain airliner longer with the longer fuselage versions?

The Boeing 737 next generation models (700,800,900ER) all have the same wingspan at 117ft 5 in. Why doesn't the wingspan increase with bigger and longer models? With the 737-900 wouldn't you need a ...
Ethan's user avatar
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30 votes
5 answers
28k views

Why aren't 737s or A320s commonly used for transatlantic flights?

Despite newer models of the 737 and A320 families having more than enough range to cross the North Atlantic (and also most of the older models, if they refuel at Gander and\or Shannon along the way; ...
Vikki's user avatar
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29 votes
1 answer
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Does a Boeing 737-800 Have a Ram Air Turbine (RAT)?

I am travelling with Thomson on a Boeing 737-800 and wondered if it had a RAT?
L.Halfpenny's user avatar
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28 votes
11 answers
17k views

Why force the nose of 737 Max down in the first place?

Can someone here explain a pretty basic question that I have had ever since this controversy came to light? I don't understand why any aircraft manufacturer, engineer, software developer, would make ...
Malik A. Rumi's user avatar
28 votes
3 answers
5k views

Is it true that different variants of the same model aircraft don't require pilot retraining?

I'm referring to this Wendover Productions video - The Economics That Made Boeing Build The 737 Max. The creator asserts that designing a new long range narrow body plane would be more expensive than ...
dwjohnston's user avatar
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26 votes
2 answers
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What is the purpose of the small fins on top of the wing surface of Boeing aircraft?

I've noticed on most Boeing aircraft that there are small fins on the upper surface of many of their wings. They are about one inch high and maybe two inches long (it's difficult to judge size from ...
BillDOe's user avatar
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25 votes
3 answers
4k views

What sort of debris has been found in 737 Max fuel tanks?

There have been numerous reports of Boeing finding "foreign object debris" in the fuel tanks of its 737 Max airliners. It's not clear what this debris is. It could range from a couple of missing ...
Party Ark's user avatar
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24 votes
3 answers
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Left hand seat, is it so important?

With reference to this article on aviation herald at Accident: Shanghai B738 at Shanghai on Jan 3rd 2020, tail strike on landing, captain and first officer swapped seats in flight where the report ...
user871199's user avatar
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24 votes
2 answers
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What is different between a B737 and B757?

Both are single aisle, 3 by 3 seating planes. Both are vaguely similar in length (with appropriate models). But they have fairly different ranges. For similar sized airplanes, why the big ...
geoffc's user avatar
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23 votes
4 answers
7k views

Is it permitted to fly a 737-800 with one pilot?

A 737-800 was scheduled to leave from a Canadian airport to Mexico, but was delayed: the airline said the reason was that one of the pilots called in sick. As a workaround, the airline flew the plane ...
Glenn Lane's user avatar
22 votes
2 answers
16k views

Why doesn't the 737 have a fuel dump nozzle?

I was watching a documentary on aircraft incidents which mentioned that the 737 does not have the facility to dump fuel. Instead they're required to fly in circles to burn off excess fuel in an ...
Danny Beckett's user avatar
22 votes
3 answers
4k views

How many parts does the latest-generation 737 share with the original 737?

There is an old paradox which states that if a boat sails round the world replacing worn out parts as it goes, once it has replaced all of itself is it still the same boat? I choose the 737 because ...
Party Ark's user avatar
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21 votes
2 answers
6k views

What are those arrow markings on the wing?

I recently flew on a Boeing 737-800 and found these arrow markings on the wing. What are they for?
256ABC's user avatar
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21 votes
3 answers
33k views

What is the purpose of a dorsal fin such as on the Boeing 737?

I've noticed that the 737 has a rather unusual vertical stabilizer, with an extension at the front. Is the 737 the only plane equipped with such a vertical stabilizer, and what is its purpose?
Madhav Sudarshan's user avatar
21 votes
2 answers
11k views

What are these lines on the nose of a Boeing 737?

What are these lines on the radome? You can also see them here: What are they and what is their function? Source: AviaFilms
user13197's user avatar
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20 votes
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What do you need to do to bring a 737 Max back in service after 6 months in storage?

What kind of maintenance has to be performed on an aircraft if it has been stored for 6 months? For example, do fluids need to be changed, have the tires become flat, etc.
Brilsmurfffje's user avatar
20 votes
1 answer
4k views

What is this string on the 737?

The other day I was spotting at Miami International (MIA/KMIA) and noticed something hanging out of the fuselage. A man with a green jacket is holding a device attached to a cable. Can somebody ...
user13197's user avatar
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19 votes
3 answers
11k views

Why does Boeing use a trim wheel in the 737 and not their other products?

Why does Boeing use a trim wheel in the 737 and not any other products? Is the trimmed state for the 737 just more important than in the 777? Or even 747? It gives the impression that a secondary ...
George Clooney In a Mooney's user avatar
19 votes
4 answers
7k views

Why did the FAA allow Boeing to self-regulate?

Amidst the Boeing 737 MAX crisis, and finding out after those two fatal crashes that Boeing's 737MAX had been issued self regulation power by the FAA, it has always bothered me, why did the FAA do ...
Gabe's user avatar
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19 votes
3 answers
6k views

Can a completely drained battery be recharged via ground power on an airliner like the B737?

When accidentally leaving the battery switch or something powered by the hot battery bus on over night, an aircraft's battery could completely discharge. Normal startup, where the battery is switched ...
Bianfable's user avatar
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19 votes
5 answers
7k views

What does the area around the fan blades in the engine nacelle contain?

I was intrigued to find this picture below. There was so much space around the engine. So what is inside of that extra space? Or is it just a hollow casing? Image Source Details about the picture as ...
Firee's user avatar
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19 votes
1 answer
10k views

What do the yellow lashes/wings on the B737 PFD indicate?

When I was looking at a YouTube clip of a B737 doing a landing, I couldn't help but notice something on the PFD: What do these yellow lashes/wings indicate on the artificial horizon? Image Source (...
Alexander Johansen's user avatar
18 votes
4 answers
7k views

Why does rudder cause roll?

In the few rudder incidents with the B737, rudder-freeze caused the airplane to roll. From what I know, the rudder causes yaw while the aileron causes roll. Why in the case of these accidents/...
SMS von der Tann's user avatar
18 votes
1 answer
10k views

What kind of liquid can be seen 'leaking' from the upper surface of the wing of a Boeing 737-800?

Can anyone advise what the liquid seen on the wing of a 737-800 on approach as highlighted on the attached images is? The liquid was seen "pulsating" from the bases marked by the arrows. As the plane ...
VH-NZZ's user avatar
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18 votes
2 answers
4k views

With the upgrade of the 737 to the Max model, what major changes are incorporated?

The Boeing 737 was originally designed in the 1960's and flew into the 1980's before a major redesign (the 737-700, -800, and -900 models) was implemented. Coming up in a few years will be the next ...
geoffc's user avatar
  • 939
18 votes
2 answers
21k views

What is this wire going from mid-fuselage to the tail on this 737?

In this question the following image is shown, with the question what the two bulges at the aft fuselage are. However, I'm wondering what this wire is that starts somewhere midway the fuselage, and ...
ROIMaison's user avatar
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18 votes
0 answers
1k views

What causes the "dead band" phenomenon during takeoff on the Boeing 737?

During takeoff, the Boeing 737 encounters a distinctive "dead band" phenomenon after the initial pitch reaches approximately 10 degrees. Essentially, a slight increase in back pressure is ...
tedioustortoise's user avatar
17 votes
4 answers
38k views

Are Boeing 737-800s grounded? [duplicate]

I’m flying on a WestJet Boeing 737-800 from Honolulu to Vancouver and then on to Toronto in July, returning on the same type of aircraft in August. Are these aircraft still grounded and are they ...
ManoW's user avatar
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17 votes
3 answers
6k views

Why didn’t Boeing ramp 737NG production back up in response to the 737 MAX groundings?

The predecessor of the currently-grounded 737 MAX is the 737 Next Generation (737NG), produced from 1997 through 2019. The NG family (comprising the 737-600, -700, -800, and -900) is extremely ...
Vikki's user avatar
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17 votes
3 answers
3k views

What is MCAS trying to fix on B737 MAX?

New sources such as Seattle Times and Aviation Week provide a pretty good overlay of the MCAS function on B737 MAX. However, I'm unclear as to the issue that MCAS is attempting to fix. From what I can ...
JZYL's user avatar
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17 votes
2 answers
14k views

What exactly are those openings in the bellies of many jetliners?

I have circled the areas (in yellow) under the belly of the 737. What exactly are those? (airliners.net)
CSinha's user avatar
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17 votes
1 answer
6k views

How did this flydubai 737NG get Max winglets?

I’ve seen this one on my way to the office in DXB. It’s clearly equipped with paired MAX winglets, however the engines are not curly. So judging by symptoms it’s not MAX. Was filming from a car, hence ...
Viktor Radchenko's user avatar
17 votes
1 answer
2k views

How controllable is the 737 in single-engine manual-reversion flight? Is it controllably landable (or go-around-able) in this condition?

The 737 is practically the only civilian jetliner still in production1 to have provisions for flight-control manual reversion; in the event of a total failure of the A and B hydraulic systems, the 737’...
Vikki's user avatar
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17 votes
1 answer
2k views

Why do the 737-100's JT8Ds, and no others, have suck-in doors?

Of the various use cases of the Pratt & Whitney JT8D (the most-produced low-bypass turbofan in history, and the second-most-produced turbofan of any description1), those installed on the 737-100 ...
Vikki's user avatar
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16 votes
5 answers
26k views

Is it possible to do a barrel roll in a large aircraft like a B737?

Can the bigger planes like B737 do barrel rolling kind of stunts like fighter jets do? I'm sure if it's full of passengers or cargo it would be very difficult and dangerous, but is it possible with an ...
NitinG's user avatar
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16 votes
1 answer
2k views

How can some stretched derivative airplanes have longer range while most have less?

On the one side A321 neo has almost the same range as the A320 neo (250 NM difference), and a LR version of A321 neo will have an even longer range. The same goes for the Dassault Falcon 7x and the ...
the world is not flat's user avatar
16 votes
3 answers
12k views

Is excess fuel leaking normal during take off of a B737?

When we look over this video it's noted that some fuel is coming off from the left wing during the rotate. This is the position of the fuel vent within the wing, ...
Germano Sarmento's user avatar
16 votes
2 answers
6k views

Why are the 737's rear doors unusable in a water landing?

The 737's rear exit doors cannot be used to evacuate the aircraft in the event of a water landing, as shown, for example, in this safety card: (Image from flight-report, via Jordy here at AvSE.) In ...
Vikki's user avatar
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