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
416 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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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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Does the Boeing 737 NG have “5” radar altitude callout?

So, I was watching a video of a Boeing 737 NG land, and heard the "5" callout. Is that an airline option or something? EDIT : link to video
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3answers
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What are the consequences of throttling up past 100% of N1?

The B737 is probably my favorite aircraft and I'm always sure to never throttle past 100% of N1. I was told the aircraft is pretty much totaled if you take N1 past 100% but you can eke out that extra ...
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2answers
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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 (...
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3answers
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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, ...
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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.
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Is it normal to take off with limited flaps on a B737?

Is it safe/normal to take off (fully loaded from Cyprus to Kenya - 6 hours) with very small flaps extended? Model of aircraft: Boeing 737-800. He used whole length of the airfield to take off, the ...
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Can computer imposed inputs be overridden on the Boeing 737-MAX?

During Lion Air Flight 610, a Boeing 737-MAX, it seems that the angle of attack sensors caused the software to believe the aircraft was stalling, thus initiating a nose-down pitch to recover from the (...
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1answer
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What are the tube shaped structures on the back of the fuselage of this 737?

A previous question asked what the little metal plates between the horizontal and vertical stabilizer were (they are vortex generators), however I am much more interested in what the gray tube shaped ...
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Can the autopilot (or stall avoidance system?) of the B737 MAX 8 be overridden by sheer force?

A New York Times article from today about the Lion Air Flight 610 crash claims that in order to control the airplane the pilot could have braced his feet on the dashboard and yanked the yoke, or ...
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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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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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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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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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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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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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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?
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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 ...
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What is that ceiling compartment of a Boeing 737?

Does somebody know what that big box in the roof of the 737 cabin is?
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1answer
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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 ...
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Why does the Boeing 737 have a pitot tube on the tail?

From this link: Can anyone explain why the Boeing 737 has a pitot tube for the elevators? Wouldn't the airspeed be measured the same from the front of the airplane and the tail? Is the airspeed ...
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Why wasn't the 737 MAX's landing gear lengthened enough to mount the engines under the wings, rather than in front of them?

The reason Boeing originally added the MCAS to the 737 MAX was to compensate for a slight pitch-up moment generated by the engine nacelles at very high angles of attack. This pitch-up moment occurred ...
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Can stored/leased 737s be used to substitute for grounded MAXs?

The 737 MAX was introduced relatively recently. I would have assumed they were replacing at least some older 737 models in operation with the major airlines that took them (eg Southwest, American, ...
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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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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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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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1answer
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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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432 views

How much does the horizontal stabilizer on a 737 move for one unit of trim?

Inspired by this question, what exactly is the meaning of a stab trim unit? Is it exactly one degree of stabilizer movement? The 737 NG FCOMv2 (9.20.9 Flight Controls - System Description) only lists ...
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2answers
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What is the THS deflection speed?

Let's restrict this question to best sellers airliners (A320 and B737). On this aircrafts, the THS is used for pitch trim. The speed requirements may not be has intense as for elevator as it control ...
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Could the Boeing 757 replace the Boeing 737 Max 8/9/10? [closed]

The "Baby Boeing" 737 started life in the 1960s with roughly half the thrust and around 60% of the weight as the 757. In stages the 737 grew into a capacity squarely in the range of the 757. ...
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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?
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Why is a 737 Original speed-restricted below 10 kft with inoperative windscreen heating?

According to this page on the 737's operational limitations, the Original 737s (737-100/-200) are limited to 250 KIAS below 10 kilofeet if the windscreen-heating system is inoperative: Anti-Ice & ...
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Why did this 737 not take off on first attempt?

This video shows a 737 'near miss' takeoff. I'm curious as to why the aircraft did not take off as expected, i.e. is there anything obvious from the video? I'm ...
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Why is the 737 MAX 7 selling so poorly?

The 737 MAX 7 is the smallest of the four major variants in Boeing's 737 MAX product line; it is intended as the successor to the highly-successful 737-700, and features a higher fuel efficiency, ...
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3answers
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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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763 views

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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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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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 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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1answer
831 views

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 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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What is the impact of thermal Anti-Ice on descent performance?

I am just another one of the passionate flight simmers trying to understand more about Anti-ice system mechanics. I am talking about the Boeing 737-800 here if it makes a difference. What bothers me ...
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1answer
736 views

What is the function of this small hole on the B737's hydraulic reservoir line?

This is picture of a B737-800. When you open the bleed system a small amount of air is discharged from this hole (marked with an arrow, lower right). What is it for? And what happens if this hole gets ...
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1answer
428 views

How many turns of a 737 trim wheel equal 2.5 degrees stabilizer deflection?

After the well known crashes I looked at the question of stabilizer trimming. In case of trim runaway the pilot is supposed to "grasp and hold" the wheel manually steering the stabilizer. Hence my ...
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0answers
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How are these flywheel-like devices used in the Boeing 737 Max? [duplicate]

The recent news video CNN's exclusive look inside a Boeing 737 Max simulator shows a 737 Max simulator cockpit. There are a pair of what look like large black flywheels on the console, shown spinning ...
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1answer
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What does the preliminary report on the Ethiopian B737 MAX accident show? [closed]

In early April the Aircraft Accident Investigation Bureau of Ethiopia released a preliminary report on the crash of Ethiopian Airlines flight 302 that happened on March 10, 2019. There apparently is ...
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168 views

Is Assumed Temperature used in conjunction with a Derate in the B737 NG?

When using an Assumed Temperature for Takeoff, is it common operational practice to also use a Derate?
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1answer
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Which 737 generations doesn't have Alpha Vane (Angle of Attack sensor)?

I was wondering if all generations have this angle of attack sensor, especially after recent 737 MAX Lion Air accident.
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Why is the A320neo considerably ahead of B737Max?

The A320neo has a 16% higher market share, 1022 more orders, 316 more MoU's and $122.1 bn greater estimated value than the B737Max. Though both were released at almost the same time (231 days gap) ...