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.
26
questions with no upvoted or accepted answers
16
votes
0
answers
890
views
What causes the "dead band" phenomenon during takeoff on the Boeing 737?
During takeoff, the Boeing 737 encounters a distinctive "dead band" phenomenon after the initial pitch reaches approximately 10 degrees. Essentially, a slight increase in back pressure is ...
7
votes
0
answers
567
views
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 ...
6
votes
0
answers
121
views
What older regulations and exemptions does Boeing's 737 line benefit from?
Boeing is occasionally accused in the press of keeping the 737 competitive by being able to avoid newer regulations and standards, either through being previously certified or by other means.
The ...
6
votes
0
answers
340
views
Why do the spoilers on the 737 only deploy to the flight detent after a flaps up landing?
Following an all flaps up (no flap) landing, the SPEED BRAKE
lever will not move beyond the FLIGHT DETENT and the spoilers
will not fully deploy (for reference this is stated in the Fcom 9.20.14 rev ...
5
votes
0
answers
306
views
Why is this placard on a Boeing 737 NG?
I was working on the cockpit of a Boeing 737 and was intrigued when I saw this placard. From what I know this has to do with Citibank being a lender or something along those lines.
Why would this be ...
4
votes
0
answers
815
views
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 ...
4
votes
0
answers
958
views
What are the locations on the Boeing 737 wing where the airfoil changes?
I would like to know where along the span of the 737 (let's say the NG) wing the two midsection airfoils are used. I am planning on running a CFD analysis of the 737 wing, and I need accurate data.
3
votes
0
answers
147
views
Why does stall warning system require 4 minutes of AC power on the 737NG?
Is it related to the Stall Management Yaw Damper (SMYD) computers starting? But the number 1 stall test is working with no need for waiting.
Please provide sources, if available.
3
votes
1
answer
972
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 ...
2
votes
0
answers
231
views
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 ...
2
votes
0
answers
321
views
Why can't you operate packs on HIGH during take-off, approach and landing on a 737-800?
It's in the FCOM Limitations Chapter and I think that these phases are critical phases of flight and I don't want to reduce my engine performance by purposely creating a high demand for bleed air from ...
2
votes
0
answers
193
views
Does the 737 MAX's engine nacelle camber affect the pitching moment?
A side view of the B737 MAX's engine nacelle shows a positive camber at the top. As nose camber of any lifting shape (wing or nacelle) generally allows more lift at higher AoA, do you think this ...
2
votes
0
answers
872
views
Is the Boeing 737 unusually susceptible to stress fatigue?
According to this Newsweek article - which seems like a reputable source - the FAA has issued a number of Airworthiness Directives to address stress fatigue concerns with the 737NG series:
Between ...
1
vote
1
answer
51
views
The role of accurate DES FORECASTS for descent planning in VNAV, during the latter stages of an approach
Giving an accurate set of criteria in the “DES FORECASTS” page of the FMC helps produce an accurate descent path.
Typical Descent Profile, Vertical Path
Adjusting the “TAI ON/OFF” (Thermal Anti Ice), ...
1
vote
0
answers
150
views
LPV, WAAS/EGNOS and GLS in 737 NG
As far as I understand, there are mainly 3 types of RNP approaches:
LNAV/VNAV - we have a set of fixes with altitudes and flying it
LPV WAAS/EGNOS - same as 1, but aircraft use special receiver ...
1
vote
0
answers
169
views
B737-800 wire routing path diagrams
I was wondering from where can I get screenshots of the aircraft internal fuselage without wall or ceiling panels showing the manufacturer wirebundle routes and ground terminal blocks like the pic ...
1
vote
0
answers
87
views
Mode S Transmission from Boeing 737 Integrated Standby Flight Display (ISFD) data?
During a recent flight, while in communication with London control*, we received a query about our RVSM (Reduced Vertical Separation Minima) compliance. Both the Captain's and First Officer's ...
1
vote
0
answers
91
views
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 ...
1
vote
0
answers
141
views
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 ...
1
vote
0
answers
117
views
For the recertification flight(s) of the 737Max, will the FAA want to see a live runaway stabilizer?
With Boeing ready to start the testing Monday, will the FAA want to see a simulated runaway trim failure in flight?
1
vote
0
answers
214
views
Was the speed trim system on the B737 Classic modified to counter increased thrust?
How much additional thrust did the 737 classic generate compared to the original 737? Was the speed trim system added to counter the additional thrust?
1
vote
1
answer
316
views
Why some airliners have autostart and others don't?
So some of the more modern FADEC equiped planes (specifically airliners like the 787) have autostart and will self monitor the engines during startup. The one thing that confused me was how a 747 ...
0
votes
0
answers
224
views
How heavy and expensive are batteries and generators on a 737?
I am currently struggling to find details on generators and batteries. For a B737 or similar, what would the cost and weight (in £ and Kg) of a battery and IDG be? And do lightweight options exist or ...
0
votes
0
answers
154
views
At what elevation is the airfield considered a high elevation field for takeoff and landing for 737-8?
At what elevation is the airfield considered a high elevation field for takeoff and landing for 737-8 ?
0
votes
0
answers
2k
views
Where do I get the latest 737NG FCOM?
So, I went online to search for the 737 FCOM, but I can only get the FCOM from 2005. Is there a 2019 version? An updated version?
0
votes
1
answer
1k
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 ...