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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1answer
750 views

Are there standard visual cues or other methods for flaring in a B737-800?

Just a newbie in the 737. I've flown 100 hours - in real life - in this lovely beast and found the landing to be very confusing: my main problem is every time just from 50 feet, the sink feels too ...
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1answer
5k views

Why does the cabin pressurisation switch have a manual mode?

Reading about Helios Flight 552 it is clear that the pressurization switch on a B737 has two modes: AUTOMATIC and MANUAL Since it appears that one of the causes of the accident was an incorrect ...
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692 views

Is the 737 Max's AOA disagreement warning light an actual light?

The New York Times article Boeing Believed a 737 Max Warning Light Was Standard. It Wasn’t. includes the following: When Boeing began delivering its 737 Max to customers in 2017, the company believed ...
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1answer
673 views

What turn to intercept a radial and how to tune in B737ng sim?

Forgive my very amateur questions, I have been out of flying for years now and I am getting fit to fly again after slight setback. I have an opportunity of doing some refresher flying in 737NG ...
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Where can I find accurate information about fuel efficiency of Airbus vs. Boeing planes?

I am trying to understand the competitive positions of Airbus and Boeing's large civil aircrafts. I would imagine fuel efficiency would be very important to airline given its large component in the ...
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495 views

Is a FAA certified plane allowed to fly everywhere in the world?

Following the debate about FAA and Boeing certification practices, I was wondering whether Europe could potentially require the Boeing 737 Max to be certified by a European agency. Is a FAA ...
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1answer
925 views

Why does the 737 auto-land trim up at around 400 feet RA?

From the 737NG FCOM: 400 Feet Radio Altitude The stabilizer is automatically trimmed an additional amount nose up. If the A/Ps subsequently disengage, forward control column force may be required to ...
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489 views

(B737s) Why is the automatic activation range of the AUTO mode in flight limited to “between idle and 5%”?

This is the explanation on the Engine Start Switch in the 737 series FCOM. What might be the reason why the automatic activation range of the AUTO (or OFF) mode in flight limited to "between idle and ...
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467 views

Why does the B737NG need electrical power for aircraft towing?

I have read the AMM for towing and one of the mentioned steps is to supply electrical power. Is it because you need power to turn on the hydraulics in order to pressurize your brakes? For B737NG
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1answer
352 views

Is there a wake turbulence difference between B737s?

I've heard pilots talking about how the new 737s produce much more wake turbulence then the model historically. They described it as similar to the 757, based on anecdotal experience. Have there been ...
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1answer
651 views

Why is the 737’s aileron/spoiler authority reduced at low flap settings?

According to the NTSB report on the crash of United Airlines Flight 585, the ability of the 737’s lateral controls (ailerons and flight spoilers) to counteract the rolling forces produced by (say) a ...
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Why the need for the MCAS on the Boeing 737 Max 8? [duplicate]

Was there a problem with stalling on 737 jets before the 737 Max, if not then why is MCAS needed on the 737 Max 8.If it was a problem why did Boeing wait so long.
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876 views

Why not more Max 8 accidents?

Why did "only" two Max 8 accidents occur? Before the grounding, there must have been at least dozens but surely 100s if not 1000s of flights with this model. How come the vast majority of ...
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Why are there two IRS switches on the 737NG?

I've noticed in some videos,that there are two IRS switches on the 737NG. Why is that so and what is the primary purpose of IRS? Also, what is the alignment of the IRS mean?
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799 views

How much thrust is applied in a 737 to achieve taxi speeds?

I'd imagine not much, but maybe none? I wouldn't be surprised if the plane moves forward without brakes alone.
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Can the parking brake be set on an 737-800 if the aircraft has no power?

If a 737-800 has no power ('dead' airplane), is it still possible to set the parking brake on? If so, how?
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what type of sensors does the Boeing 737 MAX use for MCAS?

I can imagine there are several different ways to measure angle of attack (accelerometers, relative pressure measurements between pitot tubes, etc), but I'm curious which sensors the 737 MAX uses for ...
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2k views

Why does Boeing 737 use 2 Inertial Reference Systems (IRS) and GPS?

According to this website the Boeing 737 aircraft use 2 IRS and 2 GPS: IRS L & IRS R. Why? Apparently they are totally independent of each other. Could somebody explain a little bit why they need ...
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4k views

Can you legally obtain Boeing maintenance documents?

With the correct keywords on Google, it is possible to find Boeing MPDs (Maintenance Planning Documents), as well as Task Cards, and other technical documents. I'm wondering, could a software vendor ...
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1answer
193 views

Why does the 737 Original have an explicit hydraulic-quantity indicator for only the A hydraulic system?

The 737 (Original, Classic, NG, and MAX) has two primary hydraulic systems (A and B),1 which provide power to the aircraft’s flight controls and other aircraft components (like the wheelbrakes, ...
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1answer
522 views

What material is the B737 wing skin made out of?

What material is the B737 wing skin made out of? I actually couldn't find much information on the wing skin upper and lower panel materials for the B737, the general guess is of course aluminium, but ...
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1answer
3k views

When was the Speed Trim System implemented on the Boeing 737?

The Speed Trim System (STS) is a speed stability augmentation system designed to improve flight characteristics during operations with a low gross weight, aft center of gravity and high thrust when ...
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341 views

Can the 737 Max autopilot be engaged when some sensors have failed?

If some instruments on the 737 MAX 8 fail on the Captain's side and autopilot stops, can the First Officer engage autopilot (as the instruments on his side are fine)? In the ET 302 crash the Captain ...
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How can I find out how much a passenger window of a Boeing 737 costs?

Where do I have to look to find out how much a passenger window of a Boeing 737 costs?
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Is the ground clearance of the B737 engine low compared to similar aircraft?

I'm referring to this other Question. I want to know more about the B737 and the distance between the engine and the tarmac. There are several Incidents reported, on 737 damaging the tarmac. Is the ...
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311 views

How are the 737’s elevator and aileron cables attached to their control tabs without impeding the control surfaces’ motion under hydraulic power?

The 737 (all versions thereof) is one of the few jetliners still in production to have any manual-reversion capability for its flight controls in the event of the loss of all hydraulic systems. If ...
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948 views

Why do the stabiliser trim wheels not move exactly in sync?

I've watched a few videos about the Boeing 737, and in particular because it's a bit of a current topic, about the stabiliser wheels in the cockpit. On some of these videos, which are often in ...
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899 views

Why, after decades of redesign and enhancement, does it still rain inside B737?

For as long as I can remember, seats 1A/1B suffer from rain during acceleration/takeoff as the condensation pours down from the heavens, (well, the overhead panel where the reading lights, gaspers, ...
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1answer
500 views

What exactly are the “sealed” leading-edge slats in B737 short field performance aircraft?

"The 737 design enhancements allow operators to fly increased payload in and out of airports with runways less than 5,000 feet long. The design enhancements include a two-position tail skid that ...
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1answer
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How the stabilizer cutout switch functionality has changed from Boeing 737 NG to 737 MAX?

The Boeing 737 NG has stabilizer trim cutout switches marked as MAIN ELECT (left) and AUTOPILOT (right). Turning off the right switch disables automatic stabilizer trim in autopilot mode and automatic ...
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Why are the 737 trim wheels located so close to the seats?

I recently had the opportunity to try a 737 simulator and one thing that struck me was the placement of the trim wheels. They are located dangerously close to the seats and, man, do they spin fast. I ...
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1answer
7k views

What are some differences that make the new 737 MAX winglets more efficient than a conventional winglet? [duplicate]

I was reading this article about the Boeing 737 MAX final assembly and it was saying something about the new winglet generating lift and increasing efficiency. Can you explain to me how this works, ...
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746 views

What are these light like panels on the overhead bins of Boeing 737?

These light like panels are seen in older Boeing 737s. I've never seen them turn on. Could someone enlighten (no pun intended).
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How much fuel do the new A320-Winglets burn vs. the B737-800?

Now that the new A320-Winglets have established themselves, I'm wondering if they have better fuel consumption than the B737-800? I was told that Boeing used to be marginally better. Is that still ...
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921 views

What are the locations on the Boeing 737 wing where the airfoil changes?

I would like to know where along the span of the 737 (let's say the NG) wing the two midsection airfoils are used. I am planning on running a CFD analysis of the 737 wing, and I need accurate data.
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What are these “winglets” on the roof of the 737?

I circled the parts on the fuselage in red.
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2answers
413 views

If Boeing used two sensors instead of one simultaneously, wouldn’t they be in the same position today?

this article states that the original version of MCAS was suppose to rely on two sensors, One sensor will detect a high angle of attack, therefore activating MCAS The other sensor will detect a high ...
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3answers
853 views

Will the 737 Max 10 have MCAS?

With the fuselage plugs forward of the wing, would this mean the engines are closer to CG, therefore no need for MCAS?
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551 views

What changes do narrow-body airliners undergo to serve (relatively) long routes?

I will try to pose a well-structured question here on the longest routes ever or currently served by small, narrow-body airliners - specifically, the Boeing 737 and the Airbus A319 and A320. Set ...
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1answer
346 views

What does “POS ITERV WAS CHGD” mean on the ACARS page of a Boeing 737?

During the whole flight, the message "POS ITERV WAS CHGD" appeared frequently on the ACARS page of the MCDU (Multipurpose Control and Display Unit). The aircraft is a Boeing 737. I cannot find any ...
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473 views

Why does the KC-46 use two sensors for MCAS when the 737 Max doesn’t?

this article states The KC-46 has a two-sensor MCAS system, which “compares the two readings,” the Air Force said. I’m aware that the 737 uses two sensors and always has, but the computer reads ...
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992 views

How to program an FMC if the database is missing the arrival airport?

Let's say you are in a 737 flying to Geita, Tanzania, as you can see this little airport/airstrip has an IATA code, but not an assigned ICAO code. What should you enter into the FMC if I want to fly ...
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1answer
417 views

Can 737NG GPWS and other warning voice lines/sounds be played in headphones instead of cockpit speaker?

I watched a couple of cockpit videos on the 737NG landing, and I noticed GPWS in some of the videos does not announce 500ft, 400ft, 300ft, etc. Does this mean the pilots have routed these sounds into ...
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4k views

Is there less vertical space for an engine under the wing of a 737 Max than for an A320neo?

The source of this question is the understanding that the LEAP-1B couldn't fit under the wing of a 737 without changing its longitudinal position. But this wasn't the case with the design of the LEAP-...
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Will the Boeing 737 be built with a geared turbofan engine?

I've been excited about the potential impact the new Pratt & Whitney PW1000G geared turbofan is going to have on aviation in the form of improved fuel efficiency. There are apparently already ...
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4k views

Which type of airfoil does the 737 use?

NACA airfoils are not used anymore except on some aircraft. So which type of airfoil does the 737 use? Which company designs it and builds it?
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Can the Master Caution illuminate without the System Annunciator Panel on the 737NG?

Does the master caution light illuminate only with the System Annunciator Panel? Or is the master caution illumination also connected to the related system panels? I mean if there is an indication on ...
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What would be the impact of replacing the engines on the 737 MAX, not just reworking MCAS?

There has obviously been a lot of focus on the MCAS failure following from the 737 MAX crashes. However, the MCAS appears to be a compensating control for design decisions, specifically the ...
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Is the Boeing 737 MAX 8 MCAS exceptional in operating when autopilot is off?

To the uneducated reader it seems strange the Boeing 737 MAX 8 MCAS system only operates when autopilot is off. I understand the reasoning behind why it was implemented to operate when autopilot is ...
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Why doesn’t the A320 family suffer from the same design constraints regarding engine placement/landing gear length as the Boeing 737 family?

This answer gives a pretty good description about the design issues which lead to the problems of the Boeing 737 Max (basically the same as in a video I watched a while ago): The landing gear of the ...

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