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SunExpress Boeing 737-800 suffered a left main landing gear collapse while taxiing for departure at Antalya Airport, Türkiye yesterday. The good news? It happened during taxi. You don’t even want to imagine it occurring during takeoff or landing. A few things could be at play here: The main landing...

63,355 Aufrufe • vor 7 Monaten •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 So, once the gear has been retracted, the pilots will move the gear lever from UP to OFF as part of the after takeoff checklist.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

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The MD-11 has always had a critical design flaw. It was manageable until someone screwed up. To improve fuel efficiency and range, its horizontal stabilizer was made smaller than those of earlier DC-10 variants. While the design delivered performance benefits, it also reduced the aircraft's natural pitch stability, particularly at slower speeds during approach and landing. To help compensate, the MD-11 relied heavily on computerized stability augmentation systems. Many crews also preferred flying slightly faster approaches, which improved pitch stability but could make the aircraft more challenging to manage during touchdown due to its weight and sensitivity in roll and yaw. These characteristics became evident in several high-profile accidents. In 1997, a FedEx MD-11 arriving at Newark was reportedly operating under the belief that runway length was limited, prompting the crew to aim for an immediate touchdown. The aircraft landed hard, bounced, and became unstable. Instead of executing a go-around, attempts to salvage the landing resulted in another severe impact, collapsing the landing gear and destroying the aircraft in a post-crash fire. All five crew members survived. The accident highlighted a key lesson: when an MD-11 bounced significantly after touchdown, a go-around was often the safest option. That lesson resurfaced in tragic fashion in 2009 at Narita, Japan. During strong and gusty crosswinds, a FedEx MD-11 touched down hard and bounced. Believing the aircraft could still be recovered onto the runway, the crew attempted to continue the landing. The resulting control inputs led to an even harder impact, loss of control, and a crash that destroyed the aircraft and claimed the lives of both pilots. 📹: buybygb

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