777-200 hangar landing gear test

[@upperboard]

UA Mechanics are the best! You guys rock, as someone whose flown on UAL 777's hundreds of times across the ocean, thank you for keeping me & my fellow pax safe & reliably on-time. Respect for you guys x100!

[@ashwath2207]

Legend say they are still testing it

[@WearySteerer]

Those doors must take a lot of wind pressure?

[@Napoleon_Blownapart]

They are aerodynamic.

[@bobac1083]

yes and the aerodynamic speed limit is somewhere around 250 mph / 220 knots.... anymore, and they could be ripped off....

[@badiskebsisi6541]

This operation is only during final approach and take off where the speed in still low How ever the design is made such the aircraft can fly with gears down in some case ( ferry flights ) 🇩🇿🇩🇿🇩🇿🇩🇿

[@mccloysong]

Wow. It takes 45 seconds to retract and 23 to extend. That is a long time.

[@javacup912]

+mccloysong That's just in the hangar during initial tests following rigging, or re-installation of the gear. The pressure would be the normal 2500-3000 psi, but the flow would be more like 5 to 10 gpm so the technicians have more control of the gear swing and can abort if something goes wrong (boggie tilt issue, etc). Once it's all good there, then the gear is swung at full flow, so it would take 10-15 seconds to retract. Takes installing extra supporting jack (no much weight on them) because the main doors slam hard and shake up the airplane.

[@badiskebsisi6541]

mccloysong In normal configuration with the engine driven pumps the time is less 👍🇩🇿🇩🇿🇩🇿

[@firemedic5100]

Well I'm sure that each gear assembly weighs a pound or 1000.

[@MickB235]

There must be a mother of an accumulator in that aircraft considering its powering all the gear at once apart from the sequencing of the bay doors etc

[@singleproppilot]

There are accumulators for emergency braking, but the gear is powered by four hydraulic pumps, two driven by AC motors (ACMP) and two driven by air turbines (ADP). In this video, at about 0:55 you can see the exhaust louvers for one of the ADPs at the very top of the screen. For this maintenance check, they're powering the system using an external hydraulic cart, or "mule". Those are the green hoses you see at the center of the screen entering the belly of the aircraft through the open access door.

[@michelbeauloye4269]

I am surprised to see that the area is not safe guarded at least with a ribon around the aircraft during landing gear retraction tests, as recommended by the regulation, in Europe, the EASA.

[@thardie]

Michel Beauloye there was. I was standing right at that line, so the barrier is just below the camera.

[@badiskebsisi6541]

The EASA is only there for business Before you start any simple task it takes you 3 hours preparation for 5 minutes work 🤮🤮🤮🇩🇿🇩🇿🇩🇿🇩🇿

[@leahmigwi3463]

You're right

[@VWGTI2013]

I wanna go back to school for aircraft maintenance but I wonder how it would be to land a job. Some people say the pay isn't worth and to look for something else.

[@mathewbetts4756]

Anyone know why the trunnion doors are missing during this test?

[@harrihiltunen1244]

man working on the aeroplane hangar.

[@leahmigwi3463]

But that is cool

[@MrSamFerguson]

For the individual who posted this, its NOT "Hanger" , its "Hangar". After forty years in the aviation business, I still cant believe so many so called enthusiasts get that wrong. Hangar is an old Norse word for a large cavernous building. Hanger is something you put your shirt on. If you want to be taken seriously, at least get the spelling right.

[@valegoat468]

MrSamFerguson that all you could fuckin think of during this technologikal masterpiece

[@lewissmiles3584]

What an idiot.

[@tl1146]

And there´s also a "US Hanger steak" LOL

[@CyberSystemOverload]

Oh ffs who CARES?!

[@badiskebsisi6541]

No pitch trimmer ???? -200 of course not Only -300

[@valegoat468]

At what heigh in feet is the gear deployed and how rigourous is the testing. I have a friend who won’t fly due to a bad experience with landing gear flying into Valencia.. I believe eventually it engaged and came down but they spent a further two hours in the air waiting for it to work and he hasn’t flown since

[@Jeff-sp7bg]

About 2500-3000 feet in altitude. On final approach

[@Maloy7800]

"Hey, TJ, wanna bet I'll retract this thing at 10 PSI?"

[@drfiberglass]

They seemed to be a little bit slow...

[@jerichosy]

T H No engines running, hydraulics are only powered by electrical pumps, which is slower. In-flight the running engines runs the hydraulic pumps, so gear retraction and flight controls are much snappier.

[@atav]

@@jerichosy The 777 never uses engine hydraulic power for the gear! Just like the 767, the landing gear is on the center system; only electrical and air driven pumps.

[@A9966-s3i]

Coffee break ‼️

[@luchatrokaalvaradoguajardo5185]

the landing gear identical to that of TUPOLEV 154 RUSSYAN jet

[@МаксС-к9ч]

Почему в крыле не до конца ниша закрывается ??

[@mohamedsalih3487]

on b787 The location of ground center hydraulic Pressurization self sealing coupling??? where

[@Coasterman2222]

"Gear down and locked"

[@sebastiandavis9729]

yes

[@elweewutroone]

“Three greens”

[@elweewutroone]

“Cleared to land runway 1 3 left, United 1”

[@ashwath2207]

Go around ......gear stuck.........

[@elweewutroone]

“V1” “Rotate” “Positive rate” “Gear up” “LNAV” “VNAV”

[@dogsidog0074]

Who else is hear from that one Reddit post?

[@denos.2688]

I take it those are not Harbor Freight Jack’s holding up the plane. L.o.L

[@gollycondas]

I'm somewhat fascinated by aircraft jack stands. Massive things, what do you call the attachment points on the plane? Are the stands universal or do they require adapters for different aircraft? Must be a bunch of procedures as with most everything on a plane. Thanks, KDM

[@javacup912]

+Kenneth Masters The jack attaching points are called jack pads, and they don't ride with the airplane. They are attached with bolts to the jack wing pad area and tail. A nose jack is provided for aircraft stability but its weight bearing is much less than that of the main jacks and tail. The actual jack pad ball is standard (much like a hitch on a truck, rv, etc) but they attach differently depending on the aircraft. Most procedures involve the obvious safety, disabling systems that would come on in flight (pitot/static heaters, antenna heaters, etc), brakes off, and a certain amount of clearance (typically 6 inches) which varies from aircraft to aircraft. The maintenance manual would have everything laid out.

[@gollycondas]

+javacup912 Thanks, coffee lover! I keep learning bits and pieces about aircraft and flying, always fascinating. KDM

[@JAMILNU]

Can't help thinking of Concorde where runway debris caused fatal crash...perhaps mudguards.......

[@calvinrovinescu6166]

They are using a a hydraulic power cart of sorts which is less exciting than the electric pumps.

[@javacup912]

+Julio Romeresto In flight the engine driven pumps are used to cycle the gear with augmenting from the electric pumps, which work part-time or on demand. But the main flow comes from the EDP.

[@calvinrovinescu6166]

+javacup912 on planes like the 757, 767, 777, or A320 there is always an electric pump running to power the centre hydraulic system and on the 757/767 often, but not always, the electric pumps that operate on the same systems as the EDPs will remain on for the entire flight. On the 767 and 777 there is extra help from the air driven pumps as well. I just like the noise of the electric pumps make.

[@singleproppilot]

It's easy to confuse systems with different aircraft types. On the 757, the gear is powered from the left system engine driven pump and ac motor pump, with a power transfer unit from the right system in case of a left engine failure. On the 767 and 777, the gear is powered from the center system, completely independent of the engines. The center system air driven pumps supply most of the flow for gear retraction. The 767 has one, while the 777 has two.

[@christincherian4315]

👏👏👏

[@SS08947]

Why the armed security guard??

[@மருதநாயகம்-ங6ச]

Good super 👏👏👏👏👏👏

[@tunkunrunk]

I hope that now they put a fire detector inside the landing gear bay , along with extinguisher . a plane experienced a tire overheat and a fire broke out inside landing gear bay , they didn't detected the fire on time , when thy did , it was too late , the plane turned into a fireball and crashed , all passengers on board perished

[@Draylogic]

Why would there have been a fire during the ascent. They don't use the breaks and there is very little load on the tires during takeoff. Pretty sure it was something else that caused the fire...

[@tunkunrunk]

Draylogic check this out on google: Nigeria Airways Flight 2120

[@Draylogic]

+tecknos africa the tyres weren't inflated properly. Shame though. A lot of accidents happened just to keep to schedule

[@tunkunrunk]

Draylogic scheduled to death , and always on time to the disaster . human beings lack of rationality

[@jugoojaman7940]

That's a long time to retract landing gear...a380 usually takes 13 seconds...

[@md929]

Looks like SFO

[@อภิรัตน์อินทุประภา]

ไทร์มื่ม..เมล์..ไซเลน..แฟรค์..สันยาน..อานัตสันยาน..เทค.ออฟแลนดิ่ง..รันเวย์..ชม..โปรเเกม..รุ่น.กล่อง.ปริศนา..สยาม.โปรแกรม.ขั้นตอน.การทำงาน..ล้อ.หลัง.และ.คู่.หน้า.

[@sqr2024]

People attempt to stow away in there.

[@safia1059]

سبحان الله و ما أوتيتم من العلم إلا قليلا

[@อภิรัตน์-อ2บ]

โแรเเกร.ชม.กล่อง.ปริษนา.บันทีด.

[@อภิรัตน์อินทุประภา]

อ่าน..ระบบ.เสียนทาน.สัมผ้ส.ระบบ.เอยีเอส..คาร์ลิปเปอร์..เบรค.ล้อหลัง.สัมผ้ส.เสียดทาน.ก่อน.ล้อคู่.หน้า. สัมผ้ส..แลนด์ดิ่ง..ภาค พื้น.รัรเวย์..

[@อภิรัตน์อินทุประภา]

สวิตช์..คิก..ออฟ..ไม่ต้องดาว์.

[@bluenorm]

really really smooth, not.

[@อภิรัตน์อินทุประภา]

ทัชนี่เชียร..โค.ไพรอท..เอ.ซี.ที..เอ.โฮ.ที..

[@อภิรัตน์-อ2บ]

CASTER..TAMER..TRO...CAVEND...90.

[@อภิรัตน์อินทุประภา]

ลีม.ประเภท.เครื่องยนตผิใติ.ปีก..รี.รั่น..การ.ประเภท..เดรื้องบิน.สำหรับ.ประธานธินดี.

[@Tyler-ol2zt]

@infiniteflight

[@sekhrasidmohammad8519]

ماشاء الله تعالى

[@อภิรัตน์อินทุประภา]

กล่อง ปริษนา.ชม.งาน.ค่า.นริภ้ย..รุ่น.คศ..ระบบ.การทำงาน.

[@อภิรัตน์อินทุประภา]

อาชัพ.อิสระ..แท็กซี่.แต่.ฝ่ายทรัะยากร.สินทรัพย์.ตัวเลข.

[@อภิรัตน์อินทุประภา]

สถานะการ.หน่วย.รักษาความปล ดถัย.

[@ObviousSchism]

¡ɥɔnɯ os soǝpᴉʌ ɹɐǝƃ ƃuᴉpuɐʅ ǝʌoʅ I

[@steveallen5496]

Too slow worn out

[@talismenf2253]

I was thinking the same like why are they soooo slow

[@madisonelectronic]

+Glen Batts They are slow cause a small ground pump is supplying the hydraulic pressure. In flight the speed is much higher.

[@bryanjudefernandez2195]

+Glen Batts as long as its 15 to 20 secs its ok

[@javacup912]

+Steve Allen High pressure low flow is used in the hangar for initial testing. The flow is increased in steps until a full flow swing is made and yes, it is timed around 20 seconds or less.