How the Boeing 737 hydraulic system works. (And what happens when it doesn't)
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- Опубликовано: 18 июн 2020
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The hydraulic system on the Boeing 737-800 is a fascinating system. In todays video I will give you an overview of what this system does, why it exists and what happens if something goes wrong with it. I will explain the details of both Hydraulic system A and System B as well as the Standby system and I will also tell you about the terrifying COMPLETE loss of hydraulics and what the pilots will do then.
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Mentour Pilot love your channel!! Your an awesome pilot I look up to you as an inspiration of a future pilot!
Mentour, I know you've been saying it like this for a long time, but it's "the first 100 who use", not "uses". 100 people can't be singular, so there is no "s" needed at the end of "use". And it seems to be the same in most other languages, the verb is used in the plural form when referring to a group of people.
Other than that, a great video, a lot of interesting information, thanks for that!
This sounds like the thing to use when you are late on a book report and don't have the time to read it all :-)
Happy Midsummer! Hope you got some sill och potatis.
Mentour Pilot It is quite fascinating that one is able to control a 737 with loss of hydraulics, by muscle power! 🙂
@@VladimirNicolici you should get help. Someone who let's little tiny grammar mistakes bother them usually have a mental disorder. You should go get checked. You are suffering needlessly.
As an AME who is working on 737 , I appreciate the way you explain it to people ! keep up the good work Peter !
Thank you! That’s always nice to hear from fellow aviators
@@MentourPilot thank you too
Still does not change a thing :D
I am never going to board 737 MAX, this rushed, low quality product. Same as majority who are interested in MAX sad story.
I am from Europe, MAX is not going to be certified here so at least I will not have to stress what I am boarding.
I assume you are aware that EASA and Canada gonna have their own independent recertification process. They already stated that MAX is undergoing substantial design changes (apart from software) if it wants a comeback.
That would be a strange feeling anyway, being in the cabin, high up, going fast while having this uncertainty there might be some ladders, dirty rugs, heavy tools hidden somewhere, abandoned and forgotten next to you :)
@@user-qw4jy1oy9r Still does not change a thing to me too ! It is my job and to be honest I don't care what normal people think of an aircraft they will never understand the beauty .... So ....
@@samanmahdiabadi, you rude and arrogant individual... Shame on you...
Imagine how people who lost the loved ones in MAX crashes must feel after reading your post...
No words.....
You selfish despicable creature....
Back in the late 50s Boeing's engineers were pretty ingenious. Most of them had a lot of experience dealing with WWII aircraft, so they made pretty rugged systems.
Indeed they did!
Yeah, i remember someone said, use thicker metal on the parts of the planes that arent damaged. and they asked him "why dont we strenghen the parts where the planes have all the bullet holes?" To which he replied, because these are the planes that made it back with all this damage. The ones that didnt were hit in spots that took them down.
@@majortom4543 *Does some googling* : Abraham Wald seems to be the guy you mean - a mathematician who died in 1950. I thought he was British, but he was Austrain-American actually. America was his sanctuary from the Nazis. He doesn't seem to have worked for Boeing, but apparently his son was a physicist.
Great explanation as usual, even though aileron power control units are located in main wheel well and nowhere near the ailerons. The 737-100 and early -200 series airplanes had near-disastrous hydraulic problems through the early 1970s. 'A' system was powered by engine pumps only, 'B' by electrics. Main problem was vibration of EDP pressure output lines between the engine disconnect and hydraulic power module in wheel well. Even though the lines were stainless steel, nylon cushions in the clamps securing the lines ate right through them and caused high pressure leaks that rapidly emptied 'A' reservoir. Resulted in loss of A system for flight controls but not B, total loss of landing gear and flap operating pressure. Gear could be deployed manually and flaps extended, slowly, by electric motor and standby hydraulics, but nose wheel steering was inoperative. Many emergency landings and runway retrievals resulted. Original, alternate thrust reverser system was based on accumulators rather than standby system and was likewise troublesome. By the time Boeing developed and we installed fixes for all those problems, we mechanics were thoroughly sick of being soaked in hydraulic fluid at work.
My finger when mentour pilot uploads a new video:
I am speed
Haha! Excellent! I wish more people did like you!
Mentour Pilot as soon as you upload a video based on aviation I react immediately. I go into 5th gear speed 😂😂
I try save it till I have no one to disturb me and set myself up with a coffee
OMG that poodle on the left really hamming it up around @20:45 it's like s/he knows they are on camera! So adorable!
I have such a high commitment to become a pilot, i will definitely be getting a note book and a pen on this vid. Thanks captain 😃
Got my first airline job here in the states with a legacy carrier, and going through 737 initial right now, your entire series about the systems of the 737 are great! thanks for making these, helped me understand the systems much better than just reading them out of the manuals. Thanks Pete!
Great explanation of the hydraulic system. Love hearing about the technical aspects of flying. Considering the thickness of the manual, and accompanying checklists, I would feel confident knowing that the pilots have it memorized, and can execute it automatically without going through the checklist. The buttons, switch, which should be on, which should be off, AND when, is mind blowing. I'm reminded, that even though people know how to drive, it doesn't mean they know how a car operates. Thanks for the great job that you're doing. Stay safe.
Good graphics Mentour, thank you for the explanation.
Why would anyone down vote your awesome and super informative videos here? Your videos make me remember why I am never afraid when I fly! Thank you Mentour Pilot for always providing great content!
Great video! I recently just rode second seat in Mustang and the hydraulics are amazing! I know people love FBW but there is something tactile and fun about planes using cabled hydraulics.
Great video, a good refreshment from what I studied in my Atpls.
Really awesome infographics. The topic is complex and interesting. I like the way you clarify difficult things.
Super duper thanks for your efforts sir, highly appreciated as always!
Totally love geeking out on these vids
Even if im a testcell operator for the CFM56-7B i learned a lot during this video.. thank you alot peter
Excellent video Petter! Loved it!
Wonderful presentation of a technical system. Next technical video featuring mechanisms during rotation. Thanks Mentour.
Thanks very much for the vid, Peter!
Just a suggestion, but I think Hilighting the elements of the system as you were mentioning each of them would've helped a lot.
Love your tech videos. Very good for those who are going through B737 type rating course 🤘.
@787 Wing Aviation Yes. And if you lose A or B the Autoland is also impossible...
Pilot Blog true, but what airline allows them to use auto land?
B37xM Flyer isn’t it meant to be a requirement every so often to keep pilots current. They seen videos they do it on a clear day to make sure it works and they are current incase they need it for real
@@737MaxPilot we use Autoland. At least once per month or for foggy weather...
@@tomstravels520 True and every 6 month we have low visibility operations training... Well at least in my airline 😉.
Amazing video, so much interesting details! Thanks ;)
Thank you Peter for the explanation of the connection between engine failure and autopilot system. That is exactly what I wanted to know!
Thank you Peter! Explanation was very clear regarding the hydraulic system!
Great detailed explanation video Peter!
Great video, keep it coming!
I would like to slightly correct you. Cables go through the whole aircraft, and in B737NG you actually move the cables, which than activate actuators(most of them in the wheel well , some are in the tail). I guess people think it is either hydraulics or cables on B737NG, when it is actually both in normal situation. I know that you know that as a pilot and instructor, but it might not be clear to other viewers(some of them who do not have technical background). Other than that, perfect explanation of quite complicated system. When talking to mechanics, they told me that spoiler mixer is the thing they hate on the NG due to complexity. Also, removing some actuators(for example aileron PCU) and installing them is a nightmare(due to cable rigging), unlike on A320 where it takes 20 minutes in base maintenance.
I love these videos on aviation thanks mentour👌🏾👍🏼
This video helped me pass a test for ADX! Thank you!
I love the new animations of the switches in the cockpit. Great video as always :)
yet I don't. It would be nice to have animations that highlight the thing being mentioned instead.
Awesome video. Perfect Type Rating preparation :)
Thanks for putting efforts in making these videos.
Great video Mentour I enjoyed it, have a good weekend my friend
That graphics are so cool! Great Job 😍😍
Congratulations. It is a great explaination and also the animation is amazing
FANTASTIC descriptions!
Great program! Very interesting!
Glad you looked it!!
Love all the details about the aircraft systems in this and your other videos.
Thank you! Feel free to share them around to help support the channel!
Hi! I am new on this channel. I just want to say thank you, you have a lot of great content here, all explained in an easy way. So a lot of watching ahead for me:) I hope you are doing well!
Your videos are very informative.. awesome! thanks
Thank YOU for watching them! Feel free to help the channel by sharing them around!
Great explanation, thanks !
Really good content and explanation!
Nice video Petter!, your channel has inspired me to become a aircraft maintenence technician
Not the best of times, but good luck🤭
That’s really nice to hear!
I've driven a heavy truck before with no power steering, once before I remember trying to park in a tight spot and I felt my arms were going to fall off from the pain of struggling with steering wheel. I can't even imagine how would feel to steer a plane using muscle Force.
alnett22 its nothing that drastic.
@@737MaxPilot yes it is see UA 232
@@theyaduvanshiindian391 that is not a 737. I fly the 737 on a fairly regular basis with the hydraulic assistance shut off. It is nothing like what he is talking about...then again, I am sure a 11 year old little girl would disagree with me also.
Thanks so much! Nice video
Hope to see you in the skies again. Cant wait for your first Vlog after you start flying again. Great Content and explanations. 🤛
A wealth of informations. Thank Q sir!
Great video Petter.👍
Thank u mentour for these amazing and helpful infos, since i am suffering with my ATPL studies. 😔
I feel much safer on an a 737 after I saw this video! Thank's Peter. I had a landing in Trondheim when they coulden't get the flaps down, and we stopped on the runway and used the emergensy glides off the plane. That was an old DC9 or a Carawellwelle plane from SAS. The engines almoust fell off when we landed very hard, but the pilotes saved us. No one was heart. We had to wait a long time to get a new plane from Oslo to take us to our destination Alta.
Skriver på norsk jeg, siden du er det😉
Det var vel ikke tilfeldigvis 23.feb 1987?? 🤭🤔
Been watching this channel for well over a year. Only today, I noticed the red and green throw pillows - positioned as port and starboard. Subtle, but neat!
Very good video for my knowledge
Love this video. Well done.
Thank you!
Thanks for this amazing explanation of the hydraulics system!! Can you make a video about the electrical systems on the 737 as well?
One thing Peter, 18:17 actually the leading edge devices will be in fully extended positions once you select switch in ‚down’ position (regardless of trailing edge flaps positions). Thank you so much for another, fantastic technicial movie! Greetings
Absolutely correct. My mistake
Must also place alternate flap switch in ARM position.
This was one of the best videos He has produced of all time!
I always wondered about this! I take the 737 a lot, but i never knew it still had cables in case hydraulic didn't work! Nice!
Cables can stretch break or fray. If rigged improperly the ailerons otrol.r rudder will have poor or no control.
Great Video Mentour 😁
Thank you! The channel needs some help right now so feel free to share it around.
Like the way it is simplified. Always wondered what happens if the hydraulic system fails? The standy backup is now clear to me.
Awesome video the 800 is my favorite airplane and I'm always trying to learn something new thank you. Are you back flying again mentour???
The animations are amazing!
You are the best Captain. Thank you very much for this explanation... Thank You :)
@mentour
Hi m’entoure really your videos are very helpful so 😊
Great videos always!! Have u ever had an engine failure on takeoff? Or landing? Thank u!!
No, not in the real thing. They are very reliable
This was great. Thanks, would love to see some scenarios demonstrated in X-Plane.
I will be doming full failure management videos in a real sim when this whole Pandemic is over.
Glad you liked it
Love these techy videos :P
Starting to watch this video at 7:37 am
Good stuff! Way to commit!
The irony of listening in 15 minutes to a book called "the things you can only see when you slow down" .... :-)
Hi, I always watch your videos with great interest, because this type of yt channel is very rare (high quality airplane talk). and as always this video is no exception from that. I just wanted to give a small feedback on those new animations that you were using. in my opinion it would be better to either speed them up dramatically, or not use them. it felt hard to focus on what you were saying and analyze the picture being builded in front of me, I mean it was hard to orient myself as it took time for all information to be displayed, and so my brain had to iterate multiple times over all lables to understand what I am seeing there.
the drawings themself are awesome though
Point taken
@@MentourPilot I am happy to hear that!
small advice : It would be nice to see a pointer on complex illustrations. It should point exactly on the subject, that you are describing at the moment. It's easier for novices to know, where to look at :)
Excellent. Thank you.
Glad you liked it!
Great video
Patxi & Molly are definitely overwhelmed.
Great video, Petter! My father, a retired Naval AMHC, he designed the hydraulics system for your 737s. Cool, huh? PS: Patxi looks like a zombie, lol!
Love it!
Very good video Mentour!. Could you explain how the yaw damoer works?
Check out my video on “Dutch roll”
0:17 Look at the left dog when Mentour say stay tune XDDD
Yeah, they are a funny bunch!
Thank you very much, Mentour for answering my comment reguarding the previous engine failure video! Great interesting video as always, and I thought you really NEED a RAT to steer a 737, but you have cables and enough electric backup pumps, a gravity extension, a PTU and an electric system for the flaps instead to steer, this makes sense!
Patrik Krispler
The 737NG does not have a RAT 🐀
Thats an Airbus thingy😆😉
@@claysonantoons3142 Hey, thats true😆
Forgot about that
The concept of a plane is amazing
The electric motor driven pumps are cooled by Hydraulic fluid? Yes, you're right as the hydraulic fluid passes through a HEAT EXCHANGER Located in each main fuel tank.That's why we need a certain quantity of fuel in the main tanks before turning ON the electric motor driven pumps (minimum of 1675 Lbs ). As always, your explanations are great.
Both A and B hydraulic systems have an engine-driven pump and an AC electric motor-driven pump. The system A engine-driven pump is powered by the No. 1 engine and the system B engine-driven pump is powered by the No. 2 engine. An engine-driven hydraulic pump supplies approximately 6 times the fluid volume of the related electric motor-driven hydraulic pump.
As an 737 Captain i like your all of your videos...
So happy to hear that!
I hope you're well sir !
Excelent
Please overview electrical system
Thanks
From the schematic shown, I presumed Boeing is using a closed center system and compensated pumps but your comment regarding volume/flow rate variance twixt the motor-driven and engine driven pumps makes me wonder . IAC, it wouold seem there's a great deal of control complexity introduced by having redundant control activation systems . Of course pilots don't need in-depth knowledge of the design features/philosophy in order to operate the systems and compensate for failures b ut I'm sure even the required level are considerable ! Great show series !
Petter, what about doing a video on the minimum systems needed in emergency to fly & land. Loss of hydraulics, glass cockpit displays, etc?
That first officer we see in several episodes looks like a solid pilot, looks like a really smart guy. Is there an episode that goes into detail about him?
Well done
Thank you!
even for a flight simmer this is gold.
Glad you liked it!
Those dogs look so relaxed,
It’s interesting, thank you for sharing
Great Video! Question- When there is a loss of either A or B, and the Standby System is activated by selecting Standby Rudder, is the rudder powered by only the Standby System or jointly with the Standby System and the remaining A or B system?
#AbsolutelyFantastic Video! Thanks for the shoutout 😃!
Glad you liked it!! Thanks for your help!
Wao, you're a good teacher, I got every detail you intended to get out and there was no overlapping, no misses, no out of sequence. Thank you, I did learn lots of new things.
I know on the A380 one of its backup hydraulic systems consists of a electric hydraulic pump, reservoir, and actuator all in one self contained unit at the flight control surface! Really a very good backup system as the main system can loose all it's fluid and as long as the electrical cabling is still intact you will have control!
Electro Hydrostatic Actuator. And then some of them are Electrical Backup Hydraulic Actuator which works like a conventional systems unless fluid is loss then becomes an EHA. A350 has the same type of system and the main hydraulics systems are powered by both engines so if one engine fails there is no loss in pressure in either green or yellow system
On a C141 aka 737 the tail rudder has electric as well as hydraulic operation. If testing it is safer to operate the electrical system because it moves slowly. A mechanic got killed by someone in the cockpit testing the hydraulic system. They operated a flight elevator control while performing repairs. They put a blue tag not to operate a system in case someone is in the t tail working. Preventing any injury to other personnel.
As much as I love Petter and this amazing channel (arguably one of the best on the Tube) I am finding it more difficult to watch his material of late due to my yearning for air travel, something I have not managed to engage in for nearly 6 years due to chronic health reasons even before the shutdown (as a 41 year old I have been using commercial aviation since 1982) - as awful as the airport experience has become post 9/11 it is still a means to an end and I still tend to love the actual flights themselves.
I’m so sorry to hear that. 😔
@@MentourPilot I am extremely grateful that you took the time to respond and rest assured, regardless of my current level of self misery the channel has brought me so much more joy than frustration and indeed has been the closest I have been able to get to the experience in recent years. I just hope the industry can recover from such uncertain times and that both you and all of your fantastic colleagues continue to have the opportunity to provide us all with the privilege of being able to access so much of this wonderful world. Even if I never fly again, I am lucky to have had the experience as a regular part of my life for so long as their are so many people much more worse off that they have not and may never get a chance to fly in the first place.
👍thanks for the informative video!!!
Wondering, when flying the A/C MANUALLY, can both pilots control the flying controls at the same time?
A Mohammed
On Boeing aircraft, the controls are coupled together. If one side gets jammed however, the other can be freed up with enough force. There is no reason (normally) for both pilots to be flying the airplane. Mechanically, one could control the elevators while the other controls the ailerons...but it wouldn’t work smoothly
Could you do a video on Japan Airlines 123, and what happens when a plane looses all hydraulics with no way of restoring it? I have read about JAL 123 but it intrigues me how the pilots kept the plane flying for 30+ minutes against all odds.
Most people might think that the parking brake is cable operated and completely mechanical but they would be wrong. They all use hydraulic pressure which will decrease over time and one break system is notoriously short. It's the B-737 Mark 5 brake system. To be safe you bring chocks with you to park any airplane. For long term parking you need 4 of them, but a large pair will do for nothing longer than an hour and you chock the mains, never the nose gear. First the pilot sets the parking brake. If the plane isn't moving for awhile the pilot is supposed to pull brake system breaker on the P3 panel. This totally de-energizes the circuit on the parking break preventing a slight power draw on the parking brake control valve that can cause the parking brake to lose pressure and release the breaks. That's why you always chock an airplane before you walk away. All later aircraft got rid of this problem.
Do you mean P6-3? Isnt that where it is?🤔 On long term parking (like these days🙄) we pull it (the parking brake c/b) iaw AMM.
Yesss You didn't say Joyk .. 😁 hahaha just kidding Awesome video ♥️♥️♥️
Hahaha, thanks!
Great video, but for some of us [ME, myself & I], not having a pointer to show exactly what part of the system you are refering to is difficult. Again, I love your videos, however, this was the only one I had trouble following. Yours Truly, Closet Aeronautical. Hehe!