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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662 views

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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680 views

Why is Germany not able to read data from the Boeing 737 MAX black boxes?

It is my understanding that Germany stated it does not have the capacity to read the new software, declining Ethiopia's request: "The French announcement resolved uncertainty over the fate of the ...
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What is this unusual leading edge flap on a B737-200?

On this video of Air North's gravel runway-equipped B737-200, there's what appears to be a small leading-edge flap (Krueger flap?) inboard of the engine. Refer to the screen shot below. What is this?...
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What is the maximum fuel amount that fits into the rare Boeing 737-700ER version?

Title is self explanatory: what is the exact maximum fuel amount that fits into the still rare-to-see Boeing 737-700ER version?
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Why does the 737NG EGT drop during take-off?

I noticed that the EGT drops a bit when I hit TO/GA for take-off on a 737-800.
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699 views

Who controls the cabin air temperature?

I understand the B737-800 has two air conditioning packs that handle the temperature of three zones: the cockpit, the fwd cabin and the aft cabin. I understand that which pack is turned on is ...
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594 views

Is the callout “minimums” on the 737 used to describe DH on precision approaches

So, I have heard that decision height (DH) is used to signify the height on a precision approach which the pilot has to decide whether to continue or not. But, in the 737, I only hear "approaching ...
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Why can't the 737 MAX's horizontal stabilizer autotrim be cut out by control yoke inputs?

According to this article, a horizontal stabilizer runaway on the 737 MAX, unlike with all other 737s, cannot be countered with yoke inputs: Older 737s had another way of addressing certain problems ...
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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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663 views

How much was the engine moved in the B737 Max w.r.t. older versions?

In the wake of the sad crash of ET-302, I am reading on multiple sources that the 737 Max's "engine is a bit further forward and a bit higher in relation to the wing, compared to the previous ...
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Difference between multi slats and three slats on B737 ? (leading edge devices)

What is the difference between multi slats and three slats on a B737 ?
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905 views

How does the attitude and heading reference (AHRS) work on Boeing 737 aircraft?

I would like to know how the AHRS work on Boeing 737 aircraft. If this aircraft (like every the other ones I guess) has an Inertial Reference System (IRS), composed of 3 accelerometers and 3 ...
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When extreme yoke movement cuts out stab trim on a 737-NG, does it stay off after yoke returns from limits?

I've read that the 737-NG has logic built into the stab trim system that will cause stab trim to cut out if the control column (yoke) is pulled/pushed far/hard enough (it's not clear to me if it's ...
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Why do the 737-100/200’s thrust reversers blow fully open if hydraulic pressure is removed while the reversers are partly open?

If the thrust reversers on an Original-series 737 (the 737-100 and -200) are 2 inches or more from the stowed position, and hydraulic pressure is removed from the reverser actuators, the reversers ...
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How much does a Boeing 737 wing bend/deflect in cruise conditions?

As a part of my ongoing research of a structural joint analysis of a Boeing 737, I have been looking for sources where I may be able to find the bending/deflection data during cruise conditions. I ...
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Is this ferry flight route possible for a B737-800 WL?

Recently a new aircraft, B737-86X (tail AP-BNA) was delivered to a new airline in Pakistan. The ferry flight as reported by planespotters is BFI - BGO - KHI but this seems like a large stretch given ...
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What are these parts on the wing of a Boeing 737?

In the picture above: What are the parts numbered "1" and and "3"? Is "2" maybe the reinforcement of the pylon?
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Can airlines choose whether or not to enable MCAS on their fleets, and if so, have US airlines chosen to do so?

I've been told that, although all 737 Max aircraft are equipped with MCAS, the system can be deactivated by the individual airline. I've also heard that US airlines never activated MCAS in their 737 ...
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476 views

Why are the 737's variable-speed generator drives so unreliable?

The 737 Classic has two different possible styles of engine-driven generators, distinguished by the generator's drive mechanism: the constant-speed drive (CSD) and the variable-speed constant-...
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How do the VNAV and LNAV work on the 737NG?

So, I'm very confused. Im from a Cessna background, no FMC. So, based on my understanding, you could run the autopilot independent of the FMC right? With Speed mode, HDG SEL mode, and V/S mode, am I ...
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239 views

On the 737 MAX, can the pilots switch to the backup MCAS, or switch active MCAS input to another AoA probe during flight?

According to this article, my assumptions about the Boeing 737 MAX flight control system are (please correct me if I am wrong): The aircraft has two flight control computers (FCC) The aircraft has ...
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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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Why is the B737 altitude display unneccessarily ambiguous?

I was playing FSX again lately and was flying the B737-400. So I hope it is simulated correctly and this question isn't dead on arrival :-) It always bugged me, that the altitude display on the MFD ...
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Will the Boeing 737 MAX 8's software update require recertification of the aircraft?

Will the upcoming software update for the 737 MAX require the plane to go through a new certification like a new plane?
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Does the Airbus A320 or Boeing 737 have better resolution screens in the cockpit?

I know this is kind of a specific question so if nobody knows it's fine. Does anybody know if the Airbus A320 or Boeing 737 has better resolution cockpit screens like PFD and ND? ( For the Airbus A320 ...
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When are the engine bleed air, APU and packs turned on in the B737?

When do I have to turn on the engine bleed air and APU? In videos I have seen that they are always on, and sometimes they turn them off after take-off. I also have the same question about the packs.
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What is the difference between IAN and LNAV/VNAV?

Is there a real difference or benefit in using Integrated Approach Navigation (IAN) instead of LNAV/VNAV for a non-precision approach (NPA)? Both give you lateral and vertical guidance during an NPA. ...
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What is the difference between Level Change and ALT INTV during VNAV descent?

I'm confused between the two. During descent for 737 PMDG, I usually start a descent via ALT INTV, but sometimes the plane doesn't response to ALT INTV but responds to LVL Change instead. I need help ...
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Do real aircraft have something close to the GPS/NAV modes in FSX?

I am a long-time flight simulator player and also very interested in aviation. In FSX, all aircraft have a GPS/NAV knob which allows the pilot to switch between direct GPS autopilot and VOR navigation ...
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243 views

Which was the last Boeing crash that didn't send its black boxes back to the US?

I couldn't find an answer online, so I am asking the community. The real question is how frequent it is for a Boeing crash not to send the black boxes back to the USA, and a reply to title's question ...
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Why was the 737 main rudder servo valve’s vulnerability to causing uncommanded reversals never discovered in testing?

As was discovered during the NTSB investigation into the crash of USAir Flight 427, the design of the servo valve inside the main rudder power control unit (PCU) formerly used on 737 Original- and ...
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What is the purpose of the little eyebrow windows on the Boeing 737? [duplicate]

Anybody know what these windows were used for?
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What are the CONT and FLT modes of the 737 start switches?

I pilot the PMDG 737 in my simulator and I know that before takeoff and before landing, the start switches must be set to CONT mode and at high altitudes in FLT mode. But what exactly are CONT and FLT ...
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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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462 views

Why do the flap maneuvering speed margins to stick shaker depend on altitude?

Why do the flap maneuvering margins to stick shaker reduce with increasing altitude? Ref: It is written in FCTM of the Boeing 737-800:
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What short-term alternatives do airlines have to replace their grounded Boeing MAX 8s?

The MAX 8 fleet is grounded: what are the other practical aircraft platform options available to AA, SWA or Continental that ensures that ticketed summer 2019 passengers arrive at their destinations ...
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533 views

Where can I find drawings or diagrams of the Boeing 737-800's internal layout? [closed]

I am working on an alternative fuel system for my final school research. I am applying it to the 737-800. Now I could not find info on how the internals are situated. Of course pictures of the cabin ...
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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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Could you help me identify a sound that began before pushback?

A couple of weeks ago I flew with SAS on one of its B737 (I believe -600 or -700). A few minutes before pushback and engine start, a rather annoying, high-pitch sound began - imagine a whining ...
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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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724 views

How to fly an RNAV (RNP) approach with VNAV in a Boeing 737?

Let us assume you are flying a B737NG and you are cleared for an RNAV (RNP) approach which has several legs with different altitude crossing restrictions. What do you enter in the MCP altitude window?...
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Which radio altimeter is the Boeing 737NG call outs based on?

I'm wondering which of the two Radio Altimeters: Captain (left) or F/O (right), that the 737 does the RA callouts based on. For instance, if the F/O's RA is slightly off, and passes 500ft before the ...
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Why are 737 fuselages built in Kansas?

737 fuselages are built in Wichita Kansas and are transported by train to Renton, Washington, where the plane is assembled. Why outsource the fuselage all the way to Kansas? The cost of moving the ...
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What winglet airfoils are used on the Boeing B737?

I would like to know what airfoils are used for the Boeing 737 winglets.
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282 views

Why is this exit indicator placed here?

Some Boeing 737s have this exit indicator in the cabin, attached in a seemingly odd position, next to the overhead bins, instead of in the middle. Why is it placed here?
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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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Is it possible to selectively deactivate alarms? [duplicate]

My question is restricted to Airbus an Boeing's best sellers, namely the A320 and the B737. If relevant, answer can be extended to other types. In those aircraft, there are multiple possible alarms (...
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How much does it cost to build a Boeing 737 NG? [closed]

I don't mean how much is the list price. I am asking how much does it cost for Boeing to buy the engine, wing, etc. and put it together and ship it. What is the total cost of ordering everything and ...
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817 views

What is the absolute ceiling of a 737-200?

We're trying to find the official absolute ceiling for the 737-200 for a school project. So far have only been able to maximum and service ceilings for this craft. Can anyone point us to the correct ...
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Why can’t more older 737s be retrofitted with more newer winglets?

Some background: there are four different types of winglet that have been used on various 737s over the years. The mini winglet is used to retrofit 737-200s (one of the two 737 Original variants, the ...

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