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B737 FREE-FALL (GRAVITY) GEAR EXTENSION 😮‍🔥 No hydraulics? No problem 😎 On the Boeing 737, pilots can drop the landing gear using gravity. Pull the handle → doors unlock → gear falls into place by weight and airflow. No motors. No power. Just physics doing the job. When everything... show more

aircraftmaintenancengineer

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21,009 views • 6 months ago •via X (Twitter)

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Why the 737 landing gear lever has an “OFF” position ✈️ It’s a question I get asked quite often and understandably so! “OFF” isn’t a logical position for the landing gear! The landing gear is retracted into the belly of the aircraft using hydraulic pressure. Once the gear is fully up, mechanical uplocks hold the gear safely in position. However, with the lever in the UP position, hydraulic pressure is still being applied to the system. This is unnecessary now that the gear is being held up with mechanical latches and places extra demand in the hydraulic pumps. So, once the gear has been retracted, the pilots will move the gear lever from UP to OFF as part of the after takeoff checklist. This simply removes hydraulic pressure from the retract lines. When the pilots configure the aircraft for landing, we move the landing gear lever from OFF to DOWN. This action releases the mechanical up locks and the gear is lowered using a combination of hydraulic pressure, gravity and air loads. Once the gear is fully down and locked, a green light - one for each set of wheels, will illuminate. Should the primary gear down sensors fail, we have a second set of green, gear down indicators on the overhead panel. As long as the gear is indicating down and locked on either the primary or standby indicator, the gear is down and locked and safe to land on 👍 In the very unlikely event that the gear won’t lower normally using the landing gear lever, we have a standby gear lowering system which allows the crew to manually release the gear uplocks and allow gravity to lower the gear - see my reel showing that system in operation . With airlinepilotperformance

Why the 737 landing gear lever has an “OFF” position ✈️ It’s a question I get asked quite often and understandably so! “OFF” isn’t a logical position for the landing gear! The landing gear is retracted into the belly of the aircraft using hydraulic pressure. Once the gear is fully up, mechanical uplocks hold the gear safely in position. However, with the lever in the UP position, hydraulic pressure is still being applied to the system. This is unnecessary now that the gear is being held up with mechanical latches and places extra demand in the hydraulic pumps. So, once the gear has been retracted, the pilots will move the gear lever from UP to OFF as part of the after takeoff checklist. This simply removes hydraulic pressure from the retract lines. When the pilots configure the aircraft for landing, we move the landing gear lever from OFF to DOWN. This action releases the mechanical up locks and the gear is lowered using a combination of hydraulic pressure, gravity and air loads. Once the gear is fully down and locked, a green light - one for each set of wheels, will illuminate. Should the primary gear down sensors fail, we have a second set of green, gear down indicators on the overhead panel. As long as the gear is indicating down and locked on either the primary or standby indicator, the gear is down and locked and safe to land on 👍 In the very unlikely event that the gear won’t lower normally using the landing gear lever, we have a standby gear lowering system which allows the crew to manually release the gear uplocks and allow gravity to lower the gear - see my reel showing that system in operation . With airlinepilotperformance

aircraftmaintenancengineer

19,786 views • 1 month ago

Video shows the LOT Polish Airlines Boeing 767’s successful belly landing at Warsaw on November 1, 2011. The aircraft suffered hydraulic and electrical failures that prevented the landing gear from deploying. All 231 onboard survived with no injuries or deaths. 📸 by ig/jetclubhq

Video shows the LOT Polish Airlines Boeing 767’s successful belly landing at Warsaw on November 1, 2011. The aircraft suffered hydraulic and electrical failures that prevented the landing gear from deploying. All 231 onboard survived with no injuries or deaths. 📸 by ig/jetclubhq

aircraftmaintenancengineer

35,316 views • 9 months ago

In case you were wondering, this is how it works. A towbarless aircraft tug is used to push an aircraft back from the gate. Instead of using a towbar, it drives up to the nose wheels, clamps them in place and lifts the nose landing gear slightly off the ground. The main landing gear stays on the ground at all times. Once secured, the tug controls the steering and carefully pushes the aircraft into position for taxi. Only a small part of the aircraft's weight rests on the nose gear which is why even large aircraft like the Boeing 777 can be moved safely and smoothly. After pushback, the tug lowers the nose wheels and disconnects, and the pilots continue taxiing.

In case you were wondering, this is how it works. A towbarless aircraft tug is used to push an aircraft back from the gate. Instead of using a towbar, it drives up to the nose wheels, clamps them in place and lifts the nose landing gear slightly off the ground. The main landing gear stays on the ground at all times. Once secured, the tug controls the steering and carefully pushes the aircraft into position for taxi. Only a small part of the aircraft's weight rests on the nose gear which is why even large aircraft like the Boeing 777 can be moved safely and smoothly. After pushback, the tug lowers the nose wheels and disconnects, and the pilots continue taxiing.

Mechanical Knowledge

467,411 views • 5 months ago

Today’s reel dives into the Boeing 737 horizontal stabilizer trim system. It’s a big one, hope you enjoy it! You guys liked the A321 version I posted, so here’s the 737 take: This system is cable-driven with electric motors, and you can manually trim using the trim wheels in case of failure. There’s a drum under the cockpit and another one on the actuator itself. Don't forget to close the handle on the control wheel if you're trimming electrically, it will hurt 🤣. Quite different from the Airbus family: while they also use cables, it's only for position feedback, movement is fully hydraulic via three systems. No hydraulics? No trim. But a complete failure of the hydraulic on the Airbus family is highly improbable. 📸 by ig/only_fancowl . Go follow him for more aviation content ✈️

Today’s reel dives into the Boeing 737 horizontal stabilizer trim system. It’s a big one, hope you enjoy it! You guys liked the A321 version I posted, so here’s the 737 take: This system is cable-driven with electric motors, and you can manually trim using the trim wheels in case of failure. There’s a drum under the cockpit and another one on the actuator itself. Don't forget to close the handle on the control wheel if you're trimming electrically, it will hurt 🤣. Quite different from the Airbus family: while they also use cables, it's only for position feedback, movement is fully hydraulic via three systems. No hydraulics? No trim. But a complete failure of the hydraulic on the Airbus family is highly improbable. 📸 by ig/only_fancowl . Go follow him for more aviation content ✈️

aircraftmaintenancengineer

50,988 views • 1 year ago

179 casualties' after plane with 181 people on board crashes in South Korea. 2 survivors. The plane’s landing gear failed to drop, so there were no brakes to slow the plane to a stop, so it just collided into the wall at close to full speed. #Boeing

179 casualties' after plane with 181 people on board crashes in South Korea. 2 survivors. The plane’s landing gear failed to drop, so there were no brakes to slow the plane to a stop, so it just collided into the wall at close to full speed. #Boeing

Stephen 🇰🇪

41,989 views • 1 year ago

No gear stalk? No problem. Brilliant implementation of the new Tesla Auto Shift, added for free in the Holiday Update and FSD v13.2.2. The system recognizes your intentions based on the positioning/angle of the car and its surroundings. If you then tap the brake and turn the steering wheel the way the car thinks you should, the system will automatically shift between reverse and drive appropriately. Multi point turns can now be performed quicker than with a gear stalk! Incredible work by the Tesla_AI team!

No gear stalk? No problem. Brilliant implementation of the new Tesla Auto Shift, added for free in the Holiday Update and FSD v13.2.2. The system recognizes your intentions based on the positioning/angle of the car and its surroundings. If you then tap the brake and turn the steering wheel the way the car thinks you should, the system will automatically shift between reverse and drive appropriately. Multi point turns can now be performed quicker than with a gear stalk! Incredible work by the Tesla_AI team!

Drive Tesla 🇨🇦

39,376 views • 1 year ago

#WATCH | Air India Plane Crash | Noida, UP: Former Pilot Ehsan Khalid says, "... The Flight Data Recorder, Cockpit Voice Recorder and the ACARS data will tell exactly what may have happened. The visuals show that the aircraft went down while flying. Which means there was no mid-air explosion... The visuals show that the aircraft faced a loss of power... The loss of power can be due to engine malfunction, but it is very unlikely that both engines would lose power simultaneously... It is a very big engine, and it is rare that both engines lose power due to a bird hit in a one-minute duration... The pilot gave a mayday call. This means that the failure was seen in the cockpit... They went airborne while combating that failure... I don't understand why the landing gear was still down... The landing gear is raised as soon as the flight takes off... Since the landing gear was down, it is possible that a loss of engine was detected beforehand... There are many variables, and any speculation would be unjust... The biggest question is why the landing gear was not up. The flight was at a height of 600 feet... Whether it was one problem or multiple problems, no one can say anything yet..."

#WATCH | Air India Plane Crash | Noida, UP: Former Pilot Ehsan Khalid says, "... The Flight Data Recorder, Cockpit Voice Recorder and the ACARS data will tell exactly what may have happened. The visuals show that the aircraft went down while flying. Which means there was no mid-air explosion... The visuals show that the aircraft faced a loss of power... The loss of power can be due to engine malfunction, but it is very unlikely that both engines would lose power simultaneously... It is a very big engine, and it is rare that both engines lose power due to a bird hit in a one-minute duration... The pilot gave a mayday call. This means that the failure was seen in the cockpit... They went airborne while combating that failure... I don't understand why the landing gear was still down... The landing gear is raised as soon as the flight takes off... Since the landing gear was down, it is possible that a loss of engine was detected beforehand... There are many variables, and any speculation would be unjust... The biggest question is why the landing gear was not up. The flight was at a height of 600 feet... Whether it was one problem or multiple problems, no one can say anything yet..."

ANI

529,232 views • 1 year ago

Alright, the BFU report on that Lufthansa 787 nose gear collapse at Frankfurt is out. And it’s exactly what I figured the second I saw the video. They were troubleshooting an MLG door control fault. Book says move the gear lever to UP to do the test. Problem? The nose downlock pin never went in. It was sitting in the avionics compartment . Main gear pins were fine.. nose one wasn’t. I’ve done this exact kind of job. On a B787-10. I had an SLG actuator fault after a hard landing. Had to pressure up the hydraulics and put the lever UP to deactivate it. Same thing on a B787-8 with an MLG control solenoid issue. Every single time the AMM and the DDG hammer the same warning: install the downlock pins first or you risk the gear retracting on you. You can’t just flip that lever up casually either.. there’s an override you push while you lift it. But once you do, if the pin’s missing… hydraulics do what hydraulics do. B787s have tons of redundancy in the air. On the ground during maintenance? That physical pin is the last line of defence. That’s why the main gear stayed put and the nose didn’t.

Alright, the BFU report on that Lufthansa 787 nose gear collapse at Frankfurt is out. And it’s exactly what I figured the second I saw the video. They were troubleshooting an MLG door control fault. Book says move the gear lever to UP to do the test. Problem? The nose downlock pin never went in. It was sitting in the avionics compartment . Main gear pins were fine.. nose one wasn’t. I’ve done this exact kind of job. On a B787-10. I had an SLG actuator fault after a hard landing. Had to pressure up the hydraulics and put the lever UP to deactivate it. Same thing on a B787-8 with an MLG control solenoid issue. Every single time the AMM and the DDG hammer the same warning: install the downlock pins first or you risk the gear retracting on you. You can’t just flip that lever up casually either.. there’s an override you push while you lift it. But once you do, if the pin’s missing… hydraulics do what hydraulics do. B787s have tons of redundancy in the air. On the ground during maintenance? That physical pin is the last line of defence. That’s why the main gear stayed put and the nose didn’t.

Fahad Naim

19,424 views • 1 month ago

Working the nose gear bay on the 787 and thought this was worth sharing. Those nose wheels are still spinning fast after takeoff... no hydraulic/Electric brakes like the mains. So when the gear retracts, they roll right into this nose wheel spin brake. See the belt and cleats? The tires hit them, friction slows everything down quick. Stops gyro forces, cuts vibration/noise in the bay. When the wheel or cleats wear out, the wheels can keep rolling inside longer... you hear it sometimes. Simple but smart engineering.

Working the nose gear bay on the 787 and thought this was worth sharing. Those nose wheels are still spinning fast after takeoff... no hydraulic/Electric brakes like the mains. So when the gear retracts, they roll right into this nose wheel spin brake. See the belt and cleats? The tires hit them, friction slows everything down quick. Stops gyro forces, cuts vibration/noise in the bay. When the wheel or cleats wear out, the wheels can keep rolling inside longer... you hear it sometimes. Simple but smart engineering.

Fahad Naim

39,403 views • 2 months ago

I was watching a Mayday ACI Episode on Loganair Flight 670A, and there was a small detail I didn´t understand. On the takeoff, they mention "Cycle Landing Gear" and the expert says that, quote "it is prudent to cycle the undercarriage after take off in these conditions. The slush can collect in the covers that the undercarriage tracks into. As you climb, this can refreeze as the temperature drops." So, my understanding is that they "cycle" the landing gear to prevent accumulation of Slush. How does this cycle thing work? They let it "down" for a longer period than usual? (No quizz, just asking as I honestly don´t know)

I was watching a Mayday ACI Episode on Loganair Flight 670A, and there was a small detail I didn´t understand. On the takeoff, they mention "Cycle Landing Gear" and the expert says that, quote "it is prudent to cycle the undercarriage after take off in these conditions. The slush can collect in the covers that the undercarriage tracks into. As you climb, this can refreeze as the temperature drops." So, my understanding is that they "cycle" the landing gear to prevent accumulation of Slush. How does this cycle thing work? They let it "down" for a longer period than usual? (No quizz, just asking as I honestly don´t know)

Francisco Cunha

66,078 views • 4 months ago

WATCH: IL-96 FAILS FIRST TAKEOFF — THEN FLIES WITH GEAR DOWN AFTER 10 YEARS IN STORAGE Built in 1992, this Il-96-300 was once a workhorse of Russian aviation until it retired in 2008 and was left parked at Domodedovo Airport. For over a decade, it sat untouched — until it was revived. After a light wash and startup, the jet attempted a return to the skies. The first takeoff? A no-go. But on the second attempt, it roared into the air — with its landing gear not retracting to Zhukovsky. No politics, just enjoy the avgeek moment folks. 🎥: okandrew(Youtube)

WATCH: IL-96 FAILS FIRST TAKEOFF — THEN FLIES WITH GEAR DOWN AFTER 10 YEARS IN STORAGE Built in 1992, this Il-96-300 was once a workhorse of Russian aviation until it retired in 2008 and was left parked at Domodedovo Airport. For over a decade, it sat untouched — until it was revived. After a light wash and startup, the jet attempted a return to the skies. The first takeoff? A no-go. But on the second attempt, it roared into the air — with its landing gear not retracting to Zhukovsky. No politics, just enjoy the avgeek moment folks. 🎥: okandrew(Youtube)

Turbine Traveller

317,653 views • 1 year ago

A significant airframe maintenance achievement by Team AIESL, CCU. Our engineers and technicians have successfully completed a Landing Gear Replacement followed by a Retraction Check on a Boeing 737-800 aircraft, demonstrating AIESL’s capability in executing critical maintenance activities with precision and technical excellence. The successful completion of this complex task reflects the expertise, dedication, and collaborative effort of our maintenance professionals, ensuring the aircraft’s readiness for continued safe and reliable operations. At AIESL, every challenge is an opportunity to showcase the strength of Indian aviation engineering. ✈️ Delivering confidence through capability. #AIESL #MRO #AircraftMaintenance #B737 #LandingGearReplacement #RetractionCheck #Airworthiness #AviationEngineering #MaintenanceExcellence

A significant airframe maintenance achievement by Team AIESL, CCU. Our engineers and technicians have successfully completed a Landing Gear Replacement followed by a Retraction Check on a Boeing 737-800 aircraft, demonstrating AIESL’s capability in executing critical maintenance activities with precision and technical excellence. The successful completion of this complex task reflects the expertise, dedication, and collaborative effort of our maintenance professionals, ensuring the aircraft’s readiness for continued safe and reliable operations. At AIESL, every challenge is an opportunity to showcase the strength of Indian aviation engineering. ✈️ Delivering confidence through capability. #AIESL #MRO #AircraftMaintenance #B737 #LandingGearReplacement #RetractionCheck #Airworthiness #AviationEngineering #MaintenanceExcellence

AI Engineering Services Ltd

11,857 views • 2 months ago

The secret to a smooth transition? Don’t force it. At the top of my swing, I simply let my arms and the club fall into the slot. Gravity does the work, and that natural drop sets the perfect timing for my release. Too many golfers rush from the top and lose their sequence. Trusting gravity keeps me patient, smooth, and in rhythm—just like the classic swingers of the past. Sometimes the best move you can make is no move at all. Let it fall.

The secret to a smooth transition? Don’t force it. At the top of my swing, I simply let my arms and the club fall into the slot. Gravity does the work, and that natural drop sets the perfect timing for my release. Too many golfers rush from the top and lose their sequence. Trusting gravity keeps me patient, smooth, and in rhythm—just like the classic swingers of the past. Sometimes the best move you can make is no move at all. Let it fall.

Classic Golf Swing

128,840 views • 11 months ago

😎🤌 According to Bob Lazar, UAP operate using a gravity wave-based propulsion system that distorts space-time rather than using conventional thrust 👽🛸 The craft generate power and gravity waves through a reactor fueled by a stable isotope of Element 115. In the reactor, Element 115 is bombarded with protons, briefly becomes Element 116, decays, and releases small amounts of antimatter. This antimatter annihilates with matter to produce enormous energy (near 100% efficient), which powers the craft and also creates a unique Gravity A wave (a micro-scale gravity field Lazar says is an extension of the strong nuclear force). This Gravity A wave forms around the reactor at the top of the craft. A waveguide channels it downward into three gravity amplifiers arranged in a triangle at the base. These amplifiers run at full power at all times and can phase-shift the wave (0° to 180°) to control direction and strength. By focusing and amplifying the gravity wave, the craft creates a powerful, localized gravitational distortion: - It bends/warps space-time in front of the vehicle. - This effectively pulls the destination toward the craft (instead of pushing the craft forward through space). Operation modes: - Omicron mode (hovering/low speed): Amplifiers point downward → craft balances/sits on its own gravity field (explains the characteristic wobble/bobbing seen in many videos). - Delta mode (high speed/travel): Amplifiers point forward → extreme space-time warping for rapid movement. Key effects: - No inertia (occupants feel no acceleration). - Time dilation near the craft. - Optical distortion (gravity lensing can make the craft appear blurry, shimmering, or invisible). In essence, the craft "falls" toward its target by warping space ahead of it, allowing extreme speeds, sharp turns, and interstellar travel without conventional motion or time dilation issues for the occupants. (#UAP #UFO #UFOSighting)

😎🤌 According to Bob Lazar, UAP operate using a gravity wave-based propulsion system that distorts space-time rather than using conventional thrust 👽🛸 The craft generate power and gravity waves through a reactor fueled by a stable isotope of Element 115. In the reactor, Element 115 is bombarded with protons, briefly becomes Element 116, decays, and releases small amounts of antimatter. This antimatter annihilates with matter to produce enormous energy (near 100% efficient), which powers the craft and also creates a unique Gravity A wave (a micro-scale gravity field Lazar says is an extension of the strong nuclear force). This Gravity A wave forms around the reactor at the top of the craft. A waveguide channels it downward into three gravity amplifiers arranged in a triangle at the base. These amplifiers run at full power at all times and can phase-shift the wave (0° to 180°) to control direction and strength. By focusing and amplifying the gravity wave, the craft creates a powerful, localized gravitational distortion: - It bends/warps space-time in front of the vehicle. - This effectively pulls the destination toward the craft (instead of pushing the craft forward through space). Operation modes: - Omicron mode (hovering/low speed): Amplifiers point downward → craft balances/sits on its own gravity field (explains the characteristic wobble/bobbing seen in many videos). - Delta mode (high speed/travel): Amplifiers point forward → extreme space-time warping for rapid movement. Key effects: - No inertia (occupants feel no acceleration). - Time dilation near the craft. - Optical distortion (gravity lensing can make the craft appear blurry, shimmering, or invisible). In essence, the craft "falls" toward its target by warping space ahead of it, allowing extreme speeds, sharp turns, and interstellar travel without conventional motion or time dilation issues for the occupants. (#UAP #UFO #UFOSighting)

★ UAP Luigi ★ 👁️⃤ 🇺🇸 👽MJ12 SOM1-01

43,212 views • 7 months ago

THE TOWN THAT VANISHED GRAVITY FALLS OREGON 1967 Long before the animated series made it famous, Gravity Falls was a real place—and its disappearance remains one of America’s most baffling occult mysteries. In the summer of 1967, siblings Mark and Dina Pines were sent to stay with their great-uncle Harold Pines in a quiet Oregon forest town officially named Gravity Fall. The town had everything: a sheriff’s office, a school, a lumber mill, and nearly 900 residents. But everything changed the day Mark discovered a leather-bound book, wrapped in chains and animal hide, hidden beneath a loose floorboard in his uncle’s cabin. Inside were unrecognizable symbols, ritual instructions, and horrifying sketches of creatures that defied biology. When Harold saw the book, he trembled and whispered, “They were never supposed to be let out.” Within days, Gravity Fall descended into chaos. Residents reported shadows with no source, footprints ending mid-air, and voices calling their names from the trees. Then, during a violent summer storm, all communication ceased. Roads buckled. Power failed. When authorities arrived two days later, the entire town was gone—not destroyed, not flooded, but erased. No buildings. No cars. No bodies. Just untouched forest, as if the town had never existed. Mark and Dina were found 40 miles away, dehydrated and confused, with no memory of the town, the book, or their uncle. Within a year, Gravity Fall was removed from every official U.S. map. To this day, the book has never been recovered—and no one knows what was unleashed that summer. Was it a government cover-up? A dimensional rift? Or something far older, awakened by forbidden knowledge?

THE TOWN THAT VANISHED GRAVITY FALLS OREGON 1967 Long before the animated series made it famous, Gravity Falls was a real place—and its disappearance remains one of America’s most baffling occult mysteries. In the summer of 1967, siblings Mark and Dina Pines were sent to stay with their great-uncle Harold Pines in a quiet Oregon forest town officially named Gravity Fall. The town had everything: a sheriff’s office, a school, a lumber mill, and nearly 900 residents. But everything changed the day Mark discovered a leather-bound book, wrapped in chains and animal hide, hidden beneath a loose floorboard in his uncle’s cabin. Inside were unrecognizable symbols, ritual instructions, and horrifying sketches of creatures that defied biology. When Harold saw the book, he trembled and whispered, “They were never supposed to be let out.” Within days, Gravity Fall descended into chaos. Residents reported shadows with no source, footprints ending mid-air, and voices calling their names from the trees. Then, during a violent summer storm, all communication ceased. Roads buckled. Power failed. When authorities arrived two days later, the entire town was gone—not destroyed, not flooded, but erased. No buildings. No cars. No bodies. Just untouched forest, as if the town had never existed. Mark and Dina were found 40 miles away, dehydrated and confused, with no memory of the town, the book, or their uncle. Within a year, Gravity Fall was removed from every official U.S. map. To this day, the book has never been recovered—and no one knows what was unleashed that summer. Was it a government cover-up? A dimensional rift? Or something far older, awakened by forbidden knowledge?

SANTINO

613,549 views • 7 months ago

❗️✈️🇰🇷 - Death toll from plane crash in South Korea rises to 47, more than 130 people still missing. The incident occurred when a Jeju Air flight, carrying 181 passengers and crew from Bangkok, veered off the runway upon landing, colliding with a barrier and bursting into flames. As rescue operations continue, more than 130 people remain missing, with emergency services working tirelessly to sift through the wreckage. The plane, identified as a Boeing 737, had a landing gear malfunction, which led to the catastrophic event. Initial reports suggest that a possible bird strike may have contributed to the equipment failure, although this has not yet been confirmed by official investigations.

❗️✈️🇰🇷 - Death toll from plane crash in South Korea rises to 47, more than 130 people still missing. The incident occurred when a Jeju Air flight, carrying 181 passengers and crew from Bangkok, veered off the runway upon landing, colliding with a barrier and bursting into flames. As rescue operations continue, more than 130 people remain missing, with emergency services working tirelessly to sift through the wreckage. The plane, identified as a Boeing 737, had a landing gear malfunction, which led to the catastrophic event. Initial reports suggest that a possible bird strike may have contributed to the equipment failure, although this has not yet been confirmed by official investigations.

🔥🗞The Informant

1,400,711 views • 1 year ago