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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What is the maximum wind speed a Boeing 737-800 can deal with during takeoff and landing?

I'd like to know how safe the Boeing 737-800 is during takeoff and landing when it's windy. What are the maximum wind speeds for cases of tail, head and cross winds? EDIT I've found this resource ...
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Are 737 pilots required to train in manual-reversion flight?

All jetliners prior to about 1970 had flight controls that could, if need be, be manually operated without the use of any hydraulics: Some, such as the DC-9, had manual flight controls with hydraulic ...
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What to do when pneumatic air cycle kit stops working mid-flight on Boeing 737-800?

If you are flying a B738 at FL390, and one PACK (pneumatic air cycle kit) becomes inoperable, do you have to descend to FL250? If so, do you need to divert for fuel?
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How large and heavy is the B737's built-in stair?

Some version of B737 have built in stair, which allows passengers boarding and exit without jet bridge or stair car. How much do the stair systems weigh? And how much volume do they occupy?
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Did A320 NEO need an equivalent to 737 MAX MCAS because of its bigger engines?

We read that MCAS on the Boeing 737 MAX was needed because of the new, bigger, heavier engines of the MAX compared to the previous 737 versions. The closest equivalent to MCAS on the Airbus A320 NEO ...
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What pitch attitudes are common during an emergency descent for an airliner?

What pitch attitudes are common during an emergency descent? I assume it would be a fairly nose-down attitude, but I can't imagine how steep would feel to the passengers. Suppose a gradual ...
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What is the fuel source for the APU on a B737?

Where does the fuel come from that powers the APU on a 737? My understanding is that it is from the left front main fuel tank, but I've also heard, hearsay, it can have it's own source. I know that ...
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Which models of the Boeing 737 are still in production?

The BBC is reporting that the production of 737 aircraft has been reduced from 52 to 42 per month due to a loss of 737-Max orders. It isn't clear in the report whether the Max is the only 737 being ...
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What is the procedure for an engine fire in the 737-800?

If there is a fire in one of the engines of the 737-800, what is the procedure to be followed in the following situations? Climb Cruising altitude Approach What should the pilot do in the cabin in ...
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What is an accessory gearbox?

Many 737 engines have an accessory gearbox on the 9'o clock position, which is part of why the engine has a flat-bottomed shape. What exactly is an accessory gearbox?
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Where can one buy old 737 parts? [closed]

I'm trying to build a home cockpit for the PMDG 737-800. I'm looking for some landing gear position indicator lights but I don't know where to get them from. I've tried ebay and amazon, but it ...
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Is the 737-800 a different plane from the 737 MAX 8?

I am flying on March 16 from Barbados to Toronto on a Westjet Boeing 737-800 also referred to as an aircraft type 73H on my ticket. Is this a different plane from the Boeing 737 MAX 8, grounded by ...
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Why are 737-200 engines more susceptible to separation?

It seems the 737-200 had an issue with separation of engines from the wings. Considering that the engines are mounted completely under the wings, there should be more attaching points than a modern ...
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Why does the length of the 737 vary so much?

The longest version is almost 50% longer than the shortest, and even within the "next generation" models, the difference is almost 40%. Why such a big difference in lengths?
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What is this display on the 737 Classic?

Source: YouTube I noticed that display (yellow circle) between the two CDUs. What is it for? It is not a default installation on the 737-3/4/500. It looks like a Navigation Display/MFD, but why have ...
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Has the Boeing 737 MAX MCAS system successfully prevented a stall or approach to stall condition outside testing?

The Boeing 737 MAX MCAS system has been in the press a lot as it has been implicated as a possible cause of 2 fatal crashes. The MCAS system was put in to prevent a wing stall caused by excessive ...
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Are the GPWS callouts recorded with real people or computer generated?

I absolutely love the tone of the GPWS callouts in the Boeing 737NG, and I was wondering whether the callouts where computer generated or a recording of a brilliant voice actor.
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Does the Boeing 737 MAX use electro-hydraulic actuators?

I know the B747-8 uses electro-hydraulic actuators as does the 787, but what about the 737 MAX?
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For the 737 Combi, How did changing the proportions of the passenger vs cargo areas work?

I am very interested in the 737 combi models and want to learn more about how they worked in practice. For the 737 Combi, How did changing the proportions of the passenger vs cargo areas work? I have ...
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Why does the FMC in B737 limit the climb speed to 230 knots on the VNAV mode until the leading edge devices are fully retracted?

In the VNAN climb on B737, the FMC changes the target speed from V2+20kt at liftoff, to 230kt for acceleration at the preset accleration height, then to 250kt (below 10,000ft) as the leading edge ...
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Why did Boeing not create a new 737 instead of just upgrading the old model?

This documentary claims that James McNerney - Boeing's first CEO without a background in aviation, made the decision to upgrade the 737 series to 737 MAX instead of developing a new model. Is this ...
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Why are the wings of some planes changing width?

I was travelling recently in a Boeing 737 and I noticed one thing that I didn't understand. After the takeoff the wing flaps started retracting into/under the wing, making it narrower. The opposite ...
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Would a 737 pilot use flaps in nose dive?

Since flaps help lift the plane, would they deploy flaps if the plane was nosediving? And what would they do if the back pressure was too much? I know speed increases lift, but can full throttle make ...
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Did this aircraft illegally exceed 250kts below 10,000ft?

As far as my knowledge goes: There is a 250 kt speed limit under the altitude of 10.000 feet. This screenshot seem to show an aircraft below 10.000 feet and traveling at 285 kts at the time i captured ...
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If the updated MCAS software needs two AOA sensors, doesn't that introduce a new single point of failure?

Regarding the 737 MAX story, the New York Times writes: "Boeing’s software update would require the system to rely on two sensors, rather than just one, and would not be triggered if the ...
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Did Boeing need MCAS because the 737 MAX didn’t meet FAA longitudinal stability requirements, or was it to make the MAX feel like the NG?

I’m confused on this. I’ve read in multiple different places that MCAS was required due to the easier stick forces at a high angle of attack and a high G force, and because of this, the Max didn’t ...
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Was the safe landing of Southwest flight 1380 extraordinary or expected?

I've been reading with great interest and concern about the recent Southwest flight that resulted in the first fatality in that airline's history. There's one question I haven't seen answered, though:...
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What's the purpose of this red marking on the fuselage of a Boeing 737?

I was watching some aircraft today and noticed a red marking on two of them. What is that? I've seen that marking on many other aircraft.
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How long is the training to get a Boeing 777 rating if one has a 737-200 rating?

I was wondering if anyone knows how long the training for a 777 takes if one already holds a 737-200 rating. I've looked it up online and didn't find an adequate answer. According to this site, the ...
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What does BUS mean in the startup procedure?

I noticed the term BUS in the startup procedure of a 737. What do BUS on, off and transfer mean and what is their significance?
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Why has Boeing used mini winglets on the 737-200?

I found mini winglets just in B 737-200. What's the differences between mini winglets and the blended ones which Boeing uses in more recent versions? (picture source)
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What is the lump on top of the Boeing 737? [duplicate]

What are the lumps (Circled) on top of these two Boeing 737s? I looked it up but I only found the answer for one specific Virgin Blue 737. Original image source
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What happened to the Boeing 737.X design?

What happened to the B737.X design that depicted a downward nose much like the B787? It is not apparent in the B737 Max 8.
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What will the 737 MAX 7, 8, and 9 ICAO IDs be?

Since the ICAO identifiers B737, B738, and B739 are already taken, what will the ICAO identifier for the 737 MAX 7, 8, and 9 be? Would it possibly be B73M7 etc?
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Why are there speed restrictions applied after deicing an aircraft?

The information about the 737 here mentions an interesting limitation: 737-6/900 without stiffened elevator tabs: After any ground deicing/anti-icing of the horizontal stabilizer using Type II ...
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What does VIB stand for in EICAS?

From what I know it’s measuring engine vibrations? What do the numbers actually mean? For example, 1.9 VIB:
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Are the Boeing MCAS and Airbus Alpha Protection systems the same?

I have a little question concerning MCAS from Boeing and Alpha Protection from Airbus. I think these two systems are the same, if I'm wrong please tell me. If the two 737 MAX crashed because of the ...
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What error is left uncorrected when “fast IRS align” is done?

As far as I understand, there are two ways to align the IRSs in B737s: "Full align" and "fast align." For a full alignment, you rotate the IRS selector from OFF to NAV, and for a fast alignment, you ...
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What is this intake at the back of a 737?

I've circled an intake in red on the images below. I am working on a 737 NG and I don't know what it's for. I am thinking it's a pressure probe for APU control but I am not sure. Source Front view: ...
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When do the Boeing 737 Next Generation aircraft reach End-of-life?

When can we expect the Boeing 737 Next Generation aircraft to reach End-of-life / stop flying? The Next Generation is the name given to the −600/-700/-800/-900 series of the Boeing 737 airliner.
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What kind of horizontal stabilizer does a Boeing 737 have?

Does this plane have fixed horizontal stabilizers and elevators or has it been fixed with stabilators instead?
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How is device control software checked for quality?

Many, many reports on the now infamous MCAS suggest a software patch is forthcoming in the next several weeks that will address the confounding single point of failure with the two AOA sensors that ...
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What are the advantages of the B747-8 airfoil over B737's airfoil?

The Boeing 747-8 has a new airfoil design much different than a Boeing 737's airfoil. Boeing 737 airfoil: (source: How Airplanes Fly?) Boeing 747-8 airfoil: (source: Boeing) I am a little ...
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Is it possible for the Boeing 737NG to do a powerback?

I'm curious, in a non-normal situation, where it's not possible to use a pushback tug, would it be POSSIBLE to perform a powerback on the 737NG, assuming the area was reasonably clear of FOD?
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What is this instrument above the EGT in the Boeing 737?

I would like to know what is this instrument that is above the EGT of the Boeing 737. What does it indicate?
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Is the 737's autopilot part of the FMS or is it a separate entity?

I was watching a tutorial about the FMS and the autopilot in the 737, and I am consfused. I come from a Cessna background, where there is no FMS, there is only the AP (autopilot). So, is the AP a ...
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What are the checklist items for a runaway stab trim on a B737 MAX 8 and MAX 9?

This is a follow up question to this question. This question is not directly related to the MCAS system in the new B737 MAX aircraft, instead, my question is about the checklist for a runaway stab ...
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What is the hole located below the 2nd or 3rd window of Boeing 737? [duplicate]

I see there is a hole located below the 2nd or 3rd window. What is its purpose? (Sources: flickr.com and planespotters.net)
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What is a (rough) rule of thumb for calculating fuel consumption in a modern jet airliner like Boeing 737 - 300?

I'm wondering what would be a rough rule of thumb for calculating the fuel consumption of a modern airliner like a Boeing 737 - 300. I am not asking for anything from the plane's manual or even a ...
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What is the ALT INTV on the 737's autopilot?

So, I was watching a quick tutorial on the FMC on YouTube. The FMC somehow had a 5000 ft restriction, and the guy got clearance to go higher up, and he set his altitude on the AP panel, and he pressed ...

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