Boeing 787-8, Trent 1000, Thrust Reverser operation.

[@leroyybrown]

That's so awesome to actually see the internals of the reverser. Previously I've only ever seen the sliding cowl

[@mrifixplanes1813]

leroyybrown : Glad you liked it.

[@Sukkulents_]

SO THATS HOW IT WORKS, JESUS IVE BEEN SO CONFUSED FOR SO LONG

[@mrifixplanes1813]

Glad to have helped :)

[@breadboi1248]

Bruh

[@Francois176]

Dude same here. Feels like I had a revelation.

[@NocturneImages]

wondered for so long - I can finally die

[@goblinkok]

Was a pleasure being on Boeing's strategic support team working with these aircraft every day.

[@Sm0keyX5]

As someone who 'makes' components for these engines I really enjoy videos such as this one.

[@bobsmith8368]

Thank you for sharing this video, I always wondered how it actually worked, especially internally.

[@mrifixplanes1813]

I’m very glad to have helped, thanks for taking the time to write a message :)

[@Milana-Arielle]

RR engines are beautiful!

[@MrJazml4]

Bring back more videos like this to your channel!

[@Btrgd]

Really joy of making engines

[@zbeast]

What is the max thrust setting you can have with the thrust reversers set.

[@mrifixplanes1813]

+Kobe Wild You can normally apply 60% thrust in reverse.

[@plummetplum]

@@mrifixplanes1813 What happens at max thrust? 😁

[@mrifixplanes1813]

@@plummetplum You physically can't set it to 100% in reverse, with the reverse levers at their stops, it only goes to around 60% N1 (I know you were only joking :-) )

[@monelfunkawitz3966]

@@plummetplum Bad shit happens.

[@43waler]

I used to make those kind of blocker doors, real interesting to know how they're built

[@yoyoyoyoshua]

Saw them doing this test on a 748 in the factory while walking to the 777X line yesterday.

[@xcofcd]

I'm a mechanical engineer, this is our kind of porn ;)

[@mrifixplanes1813]

:)

[@水巷-i4l]

exactly

[@Repented008]

It's beautiful. I still like the old clamshells though.

[@breadboi1248]

I am a aviation geek and seeing butters is my porn

[@kendallevans4079]

Nothing like a smooth hydraulic actuator arm, gives me goose bumps!

[@txav8tion]

Impressed that they let you film. GLAD they did. enjoy the video

[@rossmcd1573]

Sweet video! Thanks so much for the great description. I always thought the fan/cold section had a thru path front to back and the reverser blocked off that section-but I see when the door is opened it blocks off the REAR as well as the front(right side of engine in the video) I'd love to see the "target type" clamshells on the CFM airbus engines-but BAW don't have those do they... They're all IAE...

[@helloworldstein]

Wonder how different the thrust reverser on the GE version of these engines are?

[@mrifixplanes1813]

+Ron Ramen They will be almost identical, the engine cowling and thrust reversers are a Boeing manufactured part, which the GE/RR engine fits into.

[@donaldstanfield8862]

Frank Stein He means GE or RR engines.

[@thusharr]

GE and RR thrust reversers are identical..I was part of the design team :) and those chevrons are not just for appearance... they help to significantly reduce the engine noise levels ...one of the brilliant design features of the nacelle

[@plummetplum]

Does thrust reverse just neutralise the remaining thrust from landing. I thinking it can't actually produce more reverse than forward?

[@Helicopterpilot16]

Get some video of dry runs up close! That would be sweet!

[@mrifixplanes1813]

I don't really like being too close to that fan, even on dry runs. If something goes wrong and it starts, that might be a trip into the spinny bits, not good :)

[@HNT63]

Nice close up

[@sjmunoz]

I have a question, in this case here, there is not hot air in thrust reverse right ?, its just from the front propelers ?

[@garyvale8347]

is it possible for one or both thrust reversers to be accidentally deployed in flight?

[@mrifixplanes1813]

No, when there's no weight on wheels sensed by the WOW system the signal is prevented from being sent to the electronically controlled thrust reverser direction control valve.

[@garyvale8347]

very clever.....thank you for your response..................

[@iamkevinbrewer]

Are they hydraulically activated?

[@mrifixplanes1813]

+Kevin Brewer They are indeed, there are three hydraulic actuators on each side. A sync cable connects the actuators together so they work in unison.

[@zJericho101z]

That's one bigass blender.

[@TosinSalisu]

@MrIfixplanes your videos are amazing! I bet you love your job so much!

[@_Ampersand_]

Awesome needed to see this for a project.

[@djtan3313]

Now, this is wat I wanted to see!

[@Abinidab]

That's pretty slick

[@Austinflank]

I noticed the reverser only applies to the bypass air. That's interesting.

[@mrifixplanes1813]

Yes that's correct, but 80% or so of a turbofan's thrust is produced by the fan through the bypass duct. So with the thrust reverser deployed, there will always be more air, and thus more thrust, going forward than there is rearward.

[@vbscript2]

In addition to what MrIfixplanes said, even at idle, during the landing roll, there's an incredible amount of air flowing through the bypass ducts at touchdown speed. Even if you don't spin up the engine at all, unstowing the reversers is the aerodynamic equivalent of mounting two 13-foot-wide bowls underneath the wings with the concave side facing the airstream. They produce *a lot* of extra drag even if the core is left at idle (or even if it were shut down completely, for that matter.)

[@SSaugaCriss]

vbscript2 i wouldn't term it "a lot" in ground idle relative to the kinetic energy that needs to be overcome on landing rollout. that's why in almost every landing reverse "power" will be selected. what you are describing is more relevant to turboprops when discing is effective for drag.

[@derekwall200]

okay now I see how they work the reversers are inside the main fan outlet duct pushing it foward

[@CaptainStevenMarkovich]

Cool view! Subscribed

[@danirico2504]

Hehe that is how it sounds when ends slowing down during landing... Klopf! And the Dreamliner leaves the runway.

[@MTAviationPhotoFilm]

Awesome video. Is it Hydraulic or pneumatically actuated?

[@mrifixplanes1813]

Hydraulically actuated, the 787 doesn't have a pneumatic system. The engine has no pneumatic bleed ducts except for engine nose cowl anti-ice. It doesn't have the duct that would normally feed the air conditioning packs and wing anti-ice or air driven pumps. Those systems are all electric on the 787. It still does have compressor tap off points for muscle air and internal engine cooling, and it does also have engine bleed ports for surge control.

[@jerry150686]

MrIfixplanes Thx for the info, I was wondering the same. They seem so silent during extension, but when retracting, you can clearly identify hydraulic actuation. BTW, were you using some external HYD source during this test? I can't believe the ACMP's are so silent..!

[@MTAviationPhotoFilm]

MrIfixplanes Cool. Thanks for the info. I work on Crj200s and 900s. One has pneu Trs, the other has hyd. Same engines just different versions.

[@mrifixplanes1813]

jerry150686 You're right, they aren't that quiet, we had an external rig hooked up.

[@imdaman786]

Amazing video thnx ... Just wondering when the reverser doors are closing why does it make that hissing noise ?, is it because its pneumatic powered ? ...

[@mrifixplanes1813]

There isn't a pneumatic system at all on the 787. The thrust reversers are hydraulically operated. I'm not 100% sure, but the hissing noise may be the hydraulic fluid passing through the restriction orifice which controls the rate at which the translating sleeve moves. By means of a directional control valve, when deploying it is pressurized fluid moving through the orifice, and it is return fluid when the reverser is stowing. Thanks for watching.

[@DeRico1337]

+MrIfixplanes that's right, it slows the hydraulic fluid to prevent the door from slamming shut which would cause wear over time.

[@joelwirz4746]

Is it possible to operate the thrust reverser at the engine itself or is there an engineer in the cockpit?

[@mrifixplanes1813]

There's an engineer in the cockpit. If you want to operate the thrust reverser without the engine running you must: Power up the engine electronic controller using a switch (software switch on the 787) Power up the relevant hydraulic system Move the thrust reverser lever to desired position (deployed/stowed) Hold a test switch at the engine until the thrust reverser movement is complete. This is the same for both the 777 and 787

[@warmfreeze]

When you work on aircraft... dont you usually have to sign a privacy waiver to keep from giving out information such as this?

To aid BRAKING not BREAKING. Sheesh.

[@pietjepuk2071]

Thanks!! More please.

[@chiccoka]

that blocker door brackets cracking as F@ck had to replace already couple of them.

[@TheMacandpcguy]

When BA gets its A350's in 2018, will their maintenance be based at this faccility?

[@mrifixplanes1813]

TheMacandpcguy Nothing is set in stone yet, but I believe so yes.

[@Draylogic]

So are you a boeing engineer or do you work on BA's a320s aswell?

[@mrifixplanes1813]

At the moment BA engineering is split into long haul and short haul, I work in long haul so I don't work on the A320's. I do very occasionally work on the A380's but I haven't done my type training on them.

[@Draylogic]

+MrIfixplanes any reason why you went for long haul. Was it the diversity of the planes you'd work on or just the size of the planes :)

[@mrifixplanes1813]

Draylogic I didn't get a choice when I joined as a mechanic, just felt lucky to get a job in aviation as not many airline companies were hiring at the time. I am quite happy where I work. It is nice to say you work on the world's largest airline gas turbine engine though :)

[@donaldstanfield8862]

What form of power actuates this reverser?

[@mrifixplanes1813]

They run on hydraulic power, we were carrying out a full hydraulic system fluid flush (change to new fluid spec) using an external rig, hence why you can't hear the pumps running. The thrust reversers were actuated several times to flush out the old fluid from the actuators.

[@davelowe1977]

Chair goes up, chair goes down.

[@visionist7]

Are these cowls also carbon fibre?

[@mrifixplanes1813]

A large majority of it is yes.

[@visionist7]

@@mrifixplanes1813 was it a challenge to design carbon cowls which would contain the compressor & fanblades in the event of an engine explosion?

[@mrifixplanes1813]

@@visionist7 Oh I'm not a designer, I'm a maintenance engineer. However, the fan blades are enclosed in the magnesium alloy fan case. During engine certification a compulsory test is performed that ensures the fan blades will be maintained in the fan case, the engine must pass this test to be certified for flight. (you can watch the test for the Trent 900 here - kzbin.info/www/bejne/oGqaZGlqat5od6M ) I'm not sure about a similar test that ensures that the compressor and turbine blades do not leave the engine case though. That type of failure has happened several times in the past, blades have escaped the engine casing and have damaged the aircraft but they do not normally penetrate the fuselage. ( some are listed on en.wikipedia.org/wiki/Turbine_engine_failure )

[@cristianerr]

Thanks

[@mrkongsimr]

Can the plane back up on it´s own ??

[@chrisslater2222]

Some of the old US pilots used to use the reverses to back up the MD80 from the ramp when they were fed up waiting to be pushed back. So yes though that was a canopy that closed directly covered the exhaust. Forbidden now. I guess in theory this could back up given enough juice.

[@vbscript2]

Can it? Yes. Is it a good idea? Not on a low-wing aircraft with wing-mounted engines. Doing this is called "powerback" and it used to be very common in the U.S. on aircraft with tail-mounted engines (DC-9/MD-80/MD-90 and 727, for example.) With tail-mounted engines, the engines are much higher off the ground, so there's not much risk of damaging stuff on the ramp or blowing debris into the aircraft. Wing-mounted engines are much closer to the ground, so there's a lot more FOD (foreign object debris) risk. Powerback operations require that the airline has procedures submitted to and approved by the FAA for how the powerbacks will be conducted. Nowadays, airlines typically don't do this anymore, even on aircraft with tail-mounted engines. For one thing, it uses substantially more fuel than just using a tug and it's also not as safe. I have seen high-wing aircraft with wing-mounted engines do powerbacks, but there aren't many airliners with that configuration. I've seen a USAF C-17 do it, though.

[@mrkongsimr]

Thanks

[@SSaugaCriss]

it's more common with turboprops. i have seen pc12's; emb-120's; dash-8-100's all "powerback" using beta on the ramp. whether it was Co-SOP or hotdog junior crew.. that's up for debate. less risk of FOD in that scenario with the prop vs inlet fan obviously makes a difference.

[@calvinrovinescu6166]

Thai goodness they used an external hydraulic power source or we'd all be deaf with the planes own pumps if you know what I mean.

[@Brijtyphoon]

Is that Tech 6?

[@mrifixplanes1813]

Togomode _ yeah

[@ActivePilotHD]

Nice!

[@alimohammedhaider6611]

Looks like TBJ

[@thanosmanolis7783]

Very nice vid , just one question. The gases from the inner core do they also get redirected ?

[@mrifixplanes1813]

Thanks, and no, the hot stream exits as normal out the back, but it only makes up 10% of the thrust on this engine. So 90% of the commanded thrust is redirected forwards.

[@tuliomonteiro1]

Just wonderful! Thanks to Santos Dummont, the true inventor of the plane.

[@mrifixplanes1813]

I learned something, but I don't think he invented these :P

[@tuliomonteiro1]

Learned wrong, try to learn the truth.

[@mrifixplanes1813]

Ten. Ricochete Your telling me that Mr Santos Dummont invented thrust reversers did he?

[@tuliomonteiro1]

No. I'm saying that Santos Dumont invented the plane. Do you have questions?

[@mrifixplanes1813]

Ten. Ricochete That's what I meant by I learned something, that Santos Dumont was first to have powered flight and the Wright brother's attempt may not have actually happened until 1908 and not 1903 like they claimed they did.

[@kingtiger435]

I wonder what caused 16 people to dislike this

[@markfosseth8047]

I thought it was the combustion output to be diverted but it seems that the main fan air instead. Those engines are alien manufactured, this is the truth.

[@mrifixplanes1813]

Yeah, just the cold stream is diverted, but that's still a net thrust going forward due the bypass ratio, 10:1 or 90% by the fan.

[@cszabo8899]

0:02 ... “She’s a predator.”

[@youchris67]

OMG! Such explicit mechanical pornography! I'm complaining to KZbin and to the police! No one under 18 should be able to see this filth!

[@Smartzenegger]

I guess they can't find the button to start the engine. What a noobs.

[@GregariousArmadillo]

I came