How the Boeing 737 hydraulic system works. (And what happens when it doesn't)
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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.
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 😉.
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
The irony of listening in 15 minutes to a book called "the things you can only see when you slow down" .... :-)
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.
Starting to watch this video at 7:37 am
Good stuff! Way to commit!
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 :)
Are you required to practice hydraulic failure scenarios in the simulator
Yes
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!
Patxi & Molly are definitely overwhelmed.
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!
Peter, imagine what ww1 pilots would think if they saw a 737,747,777, fighter jet…….
Is it possible for the 737 to lose all hydraulics like the DC10 which had to make a emergency landing at Salt lake city
Anything is possible but highly unlikely
Possible yes. Has it happened...no. Except the 737 is still controllable without hydraulics
Not in the same way. But it is possible but very unlikely.
That's extremely improbable with any airplane if maintained properly. Is it possible? Yes, but only if it is poorly maintained or if someone screwed up badly.
The dog waited for the right moment.
Indeed! He is well trained
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!
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 😃
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 !
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!
You have no idea how reassuring this information is to reluctant fliers who imagine the start-up procedure on the 737 includes a voice that says, “Just what do you think you are doing, Peter?” Oddly, the idea that critical systems are still within human ability to control (provided sculpted biceps and flat abs are in place) so that ultimately our fate rests within the mental and physical abilities of the pilots and her/his training and instincts is very calming. I’ve said for years that the best that can be said of Donald Trump’s being hired as Pre$ident of the US is that it assures us he will not be at the controls of commercial aircraft.
I’m so happy that you feel that way! I’m doing these videos precisely for people like you!
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!
If you loose hydraulic pressure I assume no flight controls are useable,o just minimum control.this is my opinion I didn't fly big jets with their complicated systems only gliders and single engine airplanes while I was in the air cadets.pleas correct me if I'm wrong this applies to any more qualified than me.
Daniele Pelaia 18:55
Doesn't the 737 have hydraulic fuses so a puncture in one area of the system won't cripple the aircraft, I know the 747 has them thanks to JAL123
MWB Gaming Yes, it does👍🏻
even for a flight simmer this is gold.
Glad you liked it!
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.
FYI, there is a RAT on the 57. It's not just a Fifi(Airbus) deal...
0:17 Look at the left dog when Mentour say stay tune XDDD
Yeah, they are a funny bunch!
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.
Even if im a testcell operator for the CFM56-7B i learned a lot during this video.. thank you alot peter
Yesss You didn't say Joyk .. 😁 hahaha just kidding Awesome video ♥️♥️♥️
Hahaha, thanks!
Wonderful presentation of a technical system. Next technical video featuring mechanisms during rotation. Thanks Mentour.
I love these videos on aviation thanks mentour👌🏾👍🏼
Glad you liked them!
Gosh I swear I can just get a pilots license just by watching this man
Ahhhhhh The 🐶 Puppies. Can a Dog have a Cat 🐈 Nap? Who’s At The Door Patxi? Thnx! CJ
You should play x plane 11
Harry M when did you last try x-plane? Also there is a version of Xplane that is not available for home users but can be used for professional pilots flight sim
Pretty sure he has played it BEFORE he became a real pilot !!! So why would he play it NOW?!
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.
6:20 Really? Noisy for your ground handling crew😳, at my airline flight crew always turn the electical hyd pumps off during turn-around🙃
The Airbus A320 uses fly by wire correct? What do they do when both hydraulic systems are lost? Can't use cables.
Airbus A320 has 3 hydraulic systems. You’d have to loose fluid in all 3 systems to be paralysed but that would be the same in any other aircraft except those with cables. Even if the 2 engine driven pumps (yellow and green system) fail the yellow system has an electric pump and the PTU can the pressurise the green system and the blue system has the RAT but the entire aircraft can be flown with just one system working
The A330/A340 also have 3 systems but the A350/A380 have 2 but some control surfaces using Elecrro Hydrostatic Actuators which can still operate even if the main supply leaks all fluid out.
@@tomstravels520 Cool. Thanks for explaining.
Hello 👋 Commander! Hello 👋 🐶 Puppies. Afternoon Nap Time after a nice Lunch. We’re Gonna Take this .... Break time! Hey, Jared Watney Channel is buying a plane. Helicopter pilot went to Super Yachts & Now wants a plane to do videos about Super Yachts. Pretty Amazing Guy. I’ll be Back! CJ
Hi Mentour. Love the channel.
Would be great to see a video in the 737 simulator of a double hydraulic system failure.
Also i'm not entirely sure how the 'fly by wire ' A320 handles this problem given there are no cables to the actuators. I would assume that the APU would be the backup system here but then I recall with the Hudson river ditching captain Sullenberger switching on the APU which was later regarded as an example of brilliant airmanship even though this was apparently not part of the Airbus emergency procedures for this particular event.
So how is the Airbus fly able in the same situation? With no hydraulics and with the generators offline the fly by wire would presumably only have very limited battery capacity available to it. So in that case you would think that starting the APU would be one of the first priorities. My only guess is that Airbus maybe never really considered a double engine failure. Perhaps the consensus was that the only scenario where you could conceivably lose both engines would be the aircraft running out of fuel... In which case attempting to start the APU would be pointless. Or did they fly it purely on the hydraulic pressure provided by the RAT?
Can you shed any more light there?
You're asking too many different questions and switching between hydraulic and electrical failures so it is a bit confusing.
1. The A320 has 3 hydraulic systems. Green, Yellow and Blue.
2. Green system is powered by No1 EDP. Yellow is powered by No2 EDP but also has an Electric Motor Pump usually only for one engine taxi when No2 is shut down or emergency use.
3. A PTU can pressurise the opposite system if the pump has failed. So if Green pump fails, the PTU will pressurise green system as long as yellow pumps are working and vice versa.
4. Blue is powered by an electric pump or the RAT in an emergency.
5. The aircraft can fly with 2 systems failed. Which controls surfaces remain depends on which systems failed.
6. If all the EDP's and EMP's failed then the RAT will be deployed to pressurise blue system and emergency landing conducted.
7. The only time the plane would be completely unflyable is if all 3 systems leaked fluid.
If the hydraulics fail, ya gotta send the F/O down into the hull to hand crank the wheels down like a WW2 bomber bomb bay. No?
No you pull the 3 cords to release the uplocks as shown in the video
@@tomstravels520 You are incorrect Sir. Those cords need to be pulled every 4 minutes to manually spin the hydraulic pumps. (like a beyblade) One cord is for system a one for system b and the third one for the stand by system.
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.
Dear Mentor Pilot,
I have come several times to your channel because I like the way you explain things, systems etc.well done!
YET...
I will NOT suscribe to your channel because your "OK?" your "RIGHT" and your "ALRIGHT!?" are kind of out of place for such a nice and knowledgeable aviator.... definitely a personal (bad if I may) habit, therefore I will not be subscribing to your channel.
Hope you may (or not) consider this constructive comments in the name and for the benefit of us, Pilots.
Thanks!
I am assuming that the hydralic fluid is most likelt Skydrol 500. (interesting that my (adopted) father was the patent agent as he was head of the patent department of McDonnel-Douglas (before asorbed by Boeing in 1993). The inventor (so I have been told was A.. Paul Vance). He invented along with Monsanto, Skydrol.
Also, Petter, I know this is primary of hydraulic systems but I just thought of it. I know tat the AC Hz inthe cockpit is 400 Hz but the cabin with the passengers of cargo, is that 50 Hz or 60 Hz? 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!
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.
#AbsolutelyFantastic Video! Thanks for the shoutout 😃!
Glad you liked it!! Thanks for your help!
Great program! Very interesting!
Glad you looked it!!
If you lost EDP no.2 on takeoff, how would you retract flaps & slats? Using the electric pump?
And If you had a leak on takeoff & lost the hydraulic fluid from no.2 system, in this case how would retract flaps (both leading & trailing edge) & slats?
I mean the Alternate electric system could put the Trailing edge flaps up, but it doesn't work on the leading devices, does it?
When the loss of both thrusts happened, are those HYD system working by EDP of free turning Engine?? If not, when is gonna be Manual Reversion start...?? Please tell me if you know this:(
"and there is a checklist right here to simply lower the gear by gravity..."
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.
AFTER T/o with Flaps 5
Loss of Hyd sys B & Stanby Hyd sys .
Will u be able to retract Trailing edge flaps and Slats ?
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?
According to my limited research skills, the only other aircraft still flying with the ability to do manual reversion is the A-10 Warthog. It has proven to be a benefit in the event your aircraft has been shot full of holes. The whole FBW scares me. There's too many things that can go wrong.
You are the best Captain. Thank you very much for this explanation... Thank You :)
@mentour
I cannot grasp how the tiny force you are putting into the yoke can control the surfaces of a 737
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?? 🤭🤔
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???
Congratulations. It is a great explaination and also the animation is amazing
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!
How do small female pilots cope with full manual flying?
RicktheRecorder - Most planes large enough to require that kind of effort have Hydraulic Controls. For the rest, you might want to look for a surviving WASP or WAAF from WW2 (a lot of aircraft in WW2 didn’t have hydraulic assistance) or see if Hanna Reitsch or Melitta Von Stauffenberg mention it in their papers...
In our airline, we always switch off the electric hydraulic pumps after shutdown, even during short turnarounds. We only turn the pumps on if there is a strong tailwind to maintain the elevator in its neutral position.
You need to get some Aircraft wiring and some Aircraft control cables and hold them in your hands. Then you will understand and not use the same words for very different things.
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.
probably my best teacher
Thank you! I’m so happy that you like it!
Thanks for this amazing explanation of the hydraulics system!! Can you make a video about the electrical systems on the 737 as well?
As an 737 Captain i like your all of your videos...
So happy to hear that!
Totally love geeking out on these vids
Cessna citation are a line of jet aircraft flying since the 70's. They are definitively not cable driven planes.
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.
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!
How are the windshield wipers on aircraft designed so that they don't get ripped off from the aircraft, they must be on of the strongest components on the aircraft and a high speed flying knife if they failed?
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
i don't need to watch this video,
i already know when these warning lights come on the pilots make a explicative statement and go through a checklist.
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?
I have a wish wish to visit cockpit .How can I? Love you uncle. provide us more videos.
Your videos are very informative.. awesome! thanks
Thank YOU for watching them! Feel free to help the channel by sharing them around!
Anyone else realised that Mentour Pilot's PFD merch shows the aircraft going above 250 knots below 10,000 MSL?
If there is empty airspace it can be permitted at some places if you’re going direct and not following SID/STAR
@@tomstravels520 Oh wow, I didn't know that, I thought only military aircraft can have the permission to do so. Thanks for teaching me :)
Also happens for some aircraft climbing out ... a heavy at near-maximum load might have a stall speed too close for comfort to the usual speed limit. Not a problem at the other end, though, you've burned a lot of fuel on the way.
Great video Mentour I enjoyed it, have a good weekend my friend
Thank you Peter for the explanation of the connection between engine failure and autopilot system. That is exactly what I wanted to know!
737 Recurrent sim coming soon, watch Mentour Pilot.
Why doesn’t engine driven pump has an overheat illumination?
Super duper thanks for your efforts sir, highly appreciated as always!
I‘m really surprised that Boeing put in more than one hydraulic system. That just doesn’t fit with „the Boeing way“ of cutting corners. Perhaps it is mandated by the government?
Get real
Harry M slight correction. They have engine driven pumps and then engines 1/4 have air driven demand pumps and engine 2/3 have electrical demand pumps. Engine 4 also has an auxiliary electric pump and so does engine 1 on the -8i
Gerald H. - Cutting corners is the NEW “Boeing Way” with Boeing being run by Bean Counters & Accountants who are more interested in stock value than anything else - The old Boeing was run by engineers who often overengineered the aircraft...
737 has 5 hydraulic pumps
TraditionalAnglican the execution of the design principle was at fault, not the design concept. When MCAS activates correctly, the pilot likely won’t even realize it is...as they are doing something they shouldn’t be doing with passengers onboard anyway. HOW it exerted control and not having redundant input was a glaring failure, now resolved completely.
Do 737 simulators have a strong enough force-feedback system on the yokes to simulate manual flight? In your dual engine failure video, it didnt seem like there was a notable increase in effort to control the yoke, but I'm sure that wasn't your first with that in the sim, so it might have just not shown.
Yes they do
That was probably because the APU was running and powering the electric pumps
Hope to see you in the skies again. Cant wait for your first Vlog after you start flying again. Great Content and explanations. 🤛
Pillow lights accurate 😁
Great video
Good graphics Mentour, thank you for the explanation.
First thx for your channel, i need to ask you 1 ? is all you talk about lets say about 737 , a basic knowledge for all Pilots ? or have you just learned extra yourself ?
A bit of both!
I love these videos on aviation thanks mentour👌🏾👍🏼
Great video, a good refreshment from what I studied in my Atpls.
Excelent
Please overview electrical system
Thanks
Oh, and one more question... what would happend in the even of... say a wing getting pierced with loss of fluid in ALL hydraulic systems on a different jet? Are there shutoff for various parts of the plane? As in... would you just lose hydraulics on... say the right wing?
After United 232 there were supposedly shut off valves installed but not sure how they are implemented now. Didn’t help the DHL aircraft in Baghdad. The A350/A380 have electro hydraulic actuators with their own mini hydraulic circuit so if the fluid in the 2 main systems leak out then the aircraft can still be controlled as long as there is electrical power
If you lost all fluid, what is the point of closing a valve? No, it would not be isolated to one wing, it would affect everything that particular hydraulic system operates.
B37xM Flyer he means whilst the fluid is leaking if you isolate the part where the leak is occurring immediately it could prevent a further loss
@@tomstravels520 That's exactly what I meant. Thank you.
Like in the case of UAL232, if just the right part of the horizontal stabilizer/aileron had been lost, the left side could've still made a difference.
That's why I asked.
DrunkHog
There are flight control shutoff switches for each hydraulic system, which you would use in reaction to a low pressure light. You would have no means of determining where the leak was. The other operating hydraulic system would mask any loss of pressure on a flight control (meaning that you couldn’t feel any difference in the column, yoke or rudder).
Does this help?
can a boeing 737 simulator, simulate manual reversion ?
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!
This video helped me pass a test for ADX! Thank you!
Question about manual gear release, do the modern 737's still have the peep hole in the pasenger cabin floor, where the pilots can look down and check to make sure the gear is locked with the red stripes lining up?
No peep hole on the 737NG👀
Dont think the classic had one either..
No, unfortunately we don’t
@@speedbird9313 classic does have window/mirror system
I worked at a breakers yard a while ago, and a klm 737 came in, i think it was a 400, and that had little circles of carpet you could lift up above the gear bay in the passenger cabin, there was a glass sight, you literally put your eye against it, and looked at mirrors through the glass sights that were in the gear bay, those mirrors showed you the gear leg, where red stipes were painted onto a joint on the gear leg, so, should a gear indicator fail, you could double check, there was the same spy hole in the cockpit too, under where someones feet would be if they were sat in the fold down jump seat, just aft of the radio pedestal 👍
See, even as a pilot, you learn something new every day 😁
NG and max don't have a window. They have a redundant set of gear down sensors and a separate second set of indication annunciators on the overhead panel