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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895 views

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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1answer
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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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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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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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4answers
860 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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1answer
55 views

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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2answers
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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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1answer
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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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1answer
89 views

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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1answer
284 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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1answer
186 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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111 views

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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2answers
160 views

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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131 views

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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1answer
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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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110 views

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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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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1answer
81 views

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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Is the B737NG AoA indicator a “normalized” indicator?

Is the B737NG AoA indicator, when/if it exists, an indicator of "normalized" AoA, or does it indicate the actual AoA measured?
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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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82 views

Does a VNAV PTH descent need the Forecast Descent winds?

If VNAV PTH, contrary to VNAV SPD, maintains a given path angle, depending on the CI chosen, and not a given Speed, then in my mind winds shouldn't affect it, since they would only cause the Vertical ...
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152 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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109 views

In a B737 NG, when a TO is flown with an Assumed Temperature N1, is the subsequent CLB N1 also adjusted (lowered) accordingly?

The Title is my question. Because I think that if one uses a very high Assumed Temperature, the subsequent Max CLB N1 maybe higher that the TO N1.
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On the B737 FCTM, what are the limit values for strong and gust definitions?

There are definitions called as "Gusty and Strong Crosswind Condition" related to takeoff thrust setting choice and "Strong Crosswind" in touchdown in crab part of B737NG FCTM. I ...
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1answer
266 views

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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Does the Flight Acquisition Unit on the Boeing 737 NG stream data?

I noticed on B737-800 entering the flight deck on the right side there is a port Data Loader and I think this is the Flight Acquisition Unit. Is this port used exclusively for loading data to FMCs etc ...
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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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How many flight control shutoff valves are there in Boeing 737?

I came to know from a source that there are total 6 flight control SOV 3 of which associated with each of system A and B hydraulic system .but in 737 FCOM under stand by hydraulic section in schematic ...
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When do the LNAV and VNAV NPS pointers appear in the PFD of a B737NG?

I am pretty sure the LNAV NPS pointer should appear from after takeoff, if LNAV is armed. But I am not sure about the VNAV NPS pointer. A VNAV climb is based on Speed, not Path, so I assume there is ...
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1answer
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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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1answer
102 views

How is the B737NG Autopilot controlling pitch?

In particular, does the Autopilot in a B737NG control the pitch only via trim adjustment, or first via the elevators and then trim?
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1answer
157 views

Should “Thrust Reduction” and “Acceleration” heights be the same for the Boeing 737 NG?

Should the Thrust Reduction height be the same, lower or higher than the Acceleration Height? In other words, what is their "correct" sequence. I am referring specifically to the B737NG, if ...
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136 views

What is MCAS' purpose? [duplicate]

In a recent question, one of the answers states: MCAS has nothing whatsoever to do with stall recovery or stall behaviour. It was implemented strictly to make the MAX's pitch stick force response in ...
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1k views

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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843 views

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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1answer
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In the B737, does an IAN NPA require that the G/P is 3° or can the G/P angle vary?

For an IAN Approach to be recognized and work in a Boeing 737, does the Approach G/P need to be exactly 3° or can it vary?
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What programming language(s) is Boeing's MCAS written in?

What language is Boeing's MCAS written in? Thanks
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Can a completely drained battery be recharged via ground power on an airliner like the B737?

When accidentally leaving the battery switch or something powered by the hot battery bus on over night, an aircraft's battery could completely discharge. Normal startup, where the battery is switched ...
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1answer
854 views

Why are some parts of the wings not protected by the wing anti-ice system in the B737?

This picture is an explanation on the wing anti-ice system of the B737. As you see from it, the system doesn't protect the outboard leading edge slats and the leading edge flaps from icing. Anybody ...
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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 are these “winglets” on the roof of the 737?

I circled the parts on the fuselage in red.
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431 views

How does one resume a VNAV climb in a B737 NG after being instructed to level off at an altitude below the Cruise altitude?

I am referring to a Boeing 737NG. Assuming I am on a VNAV climb but I am instructed by ATC to climb only to an altitude lower than my FMC Cruise altitude. After leveling off, how do I resume my VNAV ...
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296 views

Where can I get AMM for Boeing 737NG? [closed]

I am not connected to airlines .I am just an aviation enthusiasts .while studying the 737 FCOM I realized to study AMM also .but in Google I cant find it anywhere .so can anyone tell me how to get ...
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1answer
404 views

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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311 views

Why is the ISOLATION VAVLE switched to OPEN during ENGINE START on Boeing 737?

As the SOP says in Preflight Procedure – First Officer: "ISOLATION VALVE switch – OPEN" In this way, when engine starts, the ISOLATION VALVE is OPEN not AUTO. The PACK valve is switched to ...
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3k views

Can the Landing gear be lowered when system A hydraulic pressure is lost in Boeing 737?

In the FCOM OF BOEING 737 HYDRAULIC SECTION I went through the part Landing gear transfer unit that it is used to raise the landing gear at a normal rate when system A EDP volume is lost. My query is ...
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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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