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 will Boeing release after MAX? [closed]

I am well aware that it is very, very early to talk about this, but is there any information about what Boeing is going to replace the MAX in the narrow-body medium-range segment? The 737 design is ...
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What happened to the engines on takeoff here (loud popping sound then silence) [closed]

What is the cause of the sound shortly after rotation in this short video? And does anyone know what flight this was and what happened? (i.e. incident report) as I can't find any news about a fatal ...
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What would be the lowest possible cabin altitude (respectively, highest possible pressure on board) of an airliner in 1155 Pa exterior pressure? [closed]

How well does an airliner's pressurization work at extremely high altitudes (extremely low atmospheric pressure)? Does the system provide an absolute pressure differential, or is the differential a ...
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2 votes
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Why would the 737 autopilot A disengage without engine-driven hydraulic pump during heavy demand?

Note: Loss of the system A engine-driven hydraulic pump, and a heavy demand on system A, may cause A/P A to disengage. Just finding it difficult to understand why the A/P would disengage in this case....
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What is the OUTBD PFD setting on the 737 NG MAIN PANEL DUs switch?

Each pilot on a Boeing 737 NG has a five-position switch labeled MAIN PANEL DUs that selects what appears on the two main display unit panels in front of her. Here's a picture of the left pilot's ...
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Did Helios Flight 522 take off with its pressurisation mode selector in manual? [closed]

I'm currently doing a write up on the Helios Flight 522 disaster. Full disclosure, this is a journalistic piece, and I'm not an aviation expert. I'm many hours in at this point and most of it so far ...
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Could the pilots really not trim manually to overcome MCAS, as shown in the Netflix Downfall documentary?

In the recent Netflix documentary, a claim is made that once MCAS activated, after several activations, the pilots physically could not trim the aircraft due to the speed and pitch. Is this true? I ...
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How do one "force" VNAV climb mode through a set altitude constraint?

Let's say I'm flying out of EGPH, there is a first altitude constraint at 6000ft automatically set by the FMS. After departure, I will engage my VNAV to climb on profile. VNAV will hold at 6000ft no ...
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Does the 737 have a higher aspect ratio than most later 7X7's?

In this video: The Insane Engineering of the 787 there's a chart (at around 10:40 in) which shows that the 737 (which series?) has an aspect ratio of over 9, while the 747, 757, 767 and 777 rise from ...
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What is this sound on a B737-800 Takeoff?

Does anyone know what this sound is at 12:56 on a B737-800 takeoff? The aircraft is N822SY, the airport is Denver Intl. Airport, and the runway is 34L. Thanks and have a great day!
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What are these white drops on the exhaust plug of a CFM56-7B engine?

Does anybody know what those white dried-up drops are? I checked out another Boeing 737-800 on the ramp and it also had the same defect so I'm guessing this is a common issue, or is it? This shows up ...
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How to monitor MSA sector from an RNAV waypoint in the 737?

For instance, at Manchester (EGCC) the approach procedure for RNP 23L has the MSA based off of RNAV waypoints; DOMIG bearing 142 to 322, OSNAP bearing 322 to 052, TINVA bearing 052 to 142. From NATS ...
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What's the type of screen for the PFD/ND on the 737?

What's the type of screen used on the Boeing PFD and ND displays? It doesn't seem to be LCD - because for one they didn't have them when these planes were certified and the resolution seems to be so ...
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Can a Boeing 737-800 make a smooth landing on a 7000-foot runway?

I recently flew on an Avelo (brand new airline) Boeing 737-800 to KBUR, 6886’ x 150’ runway. It was a VERY rough touchdown, the braking system made a lot of racket, and our foreheads hit the seats in ...
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Why doesn't the 737 MAX have an APU EGT gauge like all other 737s do?

On Original, Classic, and Next Generation 737s, the APU panel has an EGT (exhaust-gas temperature) gauge below the four APU caution/warning lights (all images in this question are from the 737 ...
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What is the minimum altitude needed to return to the takeoff airport in a 737 after dual engine failure?

Last week, I had my first lesson in a 737 sim. The instructor, when talking about risks with flying the 737, said the only time it would be "game over", would be if you had a double engine ...
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Continuing Airworthiness Requirements During Major Modification

I am involved in a program where the aircraft (B737) will undergo a major modification taking approximately 2 years which will ultimately result in a new type certificate being issued under a new ...
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How does the Boeing 737's implementation of RNAV and VOR approaches compare to Airbus? [closed]

How does the Boeing 737's implementation of RNAV and VOR approaches compare to Airbus?
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Will N1 shaft turn at the same time as N2 shaft?

For Turbo Fan Engine CFM56-7, was wondering how come the Fan blades (N1 shaft) turns when I turn the N2 Shaft manually. I thought N1 shaft is connected to the fan and booster rotor and LPT rotor and ...
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Why is VNAV and LNAV being prohibited with QFE?

737NG AFM says : The use of VNAV or LNAV with QFE selected is prohibited. But what's the reason of this limitation?
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How many Krueger flaps does the 737-700 have?

How many Krueger flaps does the 737-700 have? It has inboard krueger flaps, but I'm trying to make out if it has one or two.
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2 votes
2 answers
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What is the absolute ceiling of the A319-100, B737-700 and A220?

What is the absolute ceiling of the A319-100, B737-700 and A220? I have found the service ceiling in Jane's and their type certificate data sheets, but nothing on the absolute ceiling.
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Wing and horizontal/vertical tailplane airfoil type and relative thickness?

I've been searching for data on the airfoil type (namely if they are supercritical, aft-loading etc.) and relative thickness (average or in different positions) of the empennage (both horizontal and ...
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Boeing 737-800 Source Off Light and Flight Director Bias Out Of View Function

I have seen the following occur during simulator events. With a left Source Off light illuminated and the captain's autopilot and autothrottles engaged (or re-engaged): Captain's flight director ...
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What could cause both engines on a 737-200 to fail at nearly the same time?

On July 2nd a 737-200 departing from Honolulu experienced engine trouble shortly after take-off. The flight ended with the flight crew having to ditch the aircraft and being rescued by the Coast Guard....
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In the B737, does Trim Air require that air supply (by the APU, engines or external) is provided in order to operate?

Will switching ON the Trim Air switch in the B737 provide instrument cooling even without bleed air or external air supply?
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What is that little black thing tied to the vertical stabilizer? [duplicate]

I have seen this on all Boeing test planes, does this provide information on the planes performance?
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How does the B737's 'throttle offline' setting work?

I'm concerned about this article: Throttle online means that the crew can override the autothrottle logic, while Throttle offline means that the logic cannot be overridden. So for example - rejected ...
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How can I know the manufacturer of the PFD (Primary Flight Display) of the current mainstream passenger aircraft?

I'm developing a computer vision software based on the photos of these PFD (Primary Flight Display). How can I know the manufacturer of these PFD of the current mainstream passenger aircraft: B737. ...
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Would fitting a T-tail on the 737 Max make MCAS unnecessary?

This is pretty far out, so I just pose it as a question for notion or ideas, rather than conclusive answers. Considering the differences in flight characteristics between the Boeing 737 Max-8 and ...
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Who manufactured the 737 MAX flap track fairings?

I can't seem to find the information online, would anyone of you know where / by who the flap track fairing for the B737 MAX is produced?
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What would be the expected approximate ROD when descending at 250 kt IAS using LVL CHG at 10,000 ft, assuming a GW of 60t?

The question refers to a B737NG but I suppose most similarly sized airliners would show a similar ROD under the circumstances.
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5 votes
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What happens if the crew do not set a FLT ALT in the cabin pressurization panel and leave it at zero but AUTO is still selected?

On the 737NG, will the cabin maintain a lower altitude than the plane or will cabin altitude equal aircraft altitude? Will there be ANY cabin pressurization or none at all? When will the HORN sound? I ...
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15 votes
6 answers
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What kind of problems can a flight have if passenger weight is miscalculated?

There was a widely reported news story about a TUI Boeing 737 flight, where a bug in reservations system caused 38 passenger on the flight to be allocated a 38kg standard weight as opposed to the ...
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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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Does the Autopilot switch to ALT ACQ mode at a fixed altitude difference from target altitude?

For example, if climbing (or descending for that matter) at 3500 fpm, will the AP switch to ALT ACQ mode at the same point it will as when climbing or descending with 1000 fpm? Or does the point of ...
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2 votes
2 answers
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Is there a cockpit indication if the B737 flap load relief is not working properly?

On a 737, does the pilot get any cockpit indication that his Flap Load Relief is not working properly? Say for instance due to a Flap Lever Position Switch failure?
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10 votes
1 answer
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What are the random, differently-coloured rectangular patches on the top of this Boeing 737's fuselage?

The top section of this green-painted Boeing 737's fuselage was slightly faded and I noticed a few dark-green, rectangular patches on its top. They look like patch kits on a bicycle tyre's inner tube. ...
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When does the FMS in the 737NG switch to approach mode?

I fly a B737-800, and we talk about when the FMS enters "Approach mode". At this point, the FMS will command the Vref (plus additive) at the appropriate flap setting. This is helpful to know ...
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Is using a DERATE for Takeoff actually reducing the power of the engine?

When one chooses a DERATE for takeoff (TO-1 or TO-2 in the case of a B737), does the system actually reduce the available thrust of the engines, or is it computing a N1 that corresponds to the reduced ...
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6 votes
1 answer
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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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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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Referring to the B737NG, at what point (height) does a TOGA revert to LVL CHG after the takeoff?

If one takes off with HDG SEL armed and no vertical mode (like VNAV) armed, at what height (AGL) will the vertical mode switch from TOGA to LVL CHG, and what will be the IAS applied? Also, why isn't ...
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Which FARs does the Boeing 737 MAX conform to with respect to turbulence?

Based on this question/answer it seems that the FARs in relation to turbulence handling have been updated several times over the years. Does the Boeing 737 MAX conform to the latest FARs or to the ...
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How to deal with both a speed and an altitude crossing restriction while in VNAV PTH descent (Boeing 737NG)?

Suppose you are in VNAV PTH descent and are approaching the IAF for your Approach, The IAF has both an altitude crossing restriction and a speed restriction. Assume that your VNAV PTH descent is at ...
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Is it possible to define a "good landing" in terms of pitch angle and vertical speed?

Is there a specific combination of pitch angle and vertical speed at touchdown that would be usually be considered a "good landing" in a B737NG?
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2 votes
1 answer
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Is AA actually flying the 737 MAX?

In flightradar24 I only see 737 MAX flying from Gol Airlines and Aeromexico, but none from AA. Is American actually flying the 737 MAX or is FlightRadar24 reporting aircraft types wrong ? I also see a ...
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2 votes
2 answers
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What does "transition of glideslope intercept waypoint" mean in the 737 FCOM?

In the Boeing 737NG FCOM, I've read this statement: VNAV mode is terminated by any one of the following: selecting another pitch mode glideslope capture reaching end of LNAV route transition of ...
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1 vote
2 answers
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What are the conditions under which one would normally switch on the Engine and the Wing Anti Ice?

As per the title. But I would also like to know if both (Engine and Wing) are turned on at the same time or if different conditions dictate the use of each one. I am specifically interested in the ...
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1 vote
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In the B737NG, is the CTR tank fuel the first to be pumped when there is fuel in all tanks?

In a B737NG, assuming you have fuel in all tanks, Wings and Center, and that all pump switches are ON, will the fuel from the CTR tank be the first to be pumped, despite all Fuel pump switches being ...
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