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C919 Minimum Unstick Speed (VMU) Testing This footage captures the C919 undergoing VMU testing, where the crew intentionally rotates to a high pitch angle to drag the tail bumper along the runway. This maneuver determines the aircraft’s absolute minimum lift-off speed, providing the baseline data used to calculate safe...

64,299 просмотров • 26 дней назад •via X (Twitter)

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100-TONNE TAKEOFF WEIGHT ERROR CAUSED B777 TAIL STRIKE AT MILAN On 9 July 2024, LATAM Boeing 777-300ER PT-MUG struck its tail during takeoff from Milan Malpensa after departing with performance data based on a 100-tonne weight error. Investigators found the crew used 228.8 tonnes instead of the correct 328.4 tonnes when calculating takeoff performance for São Paulo. The incorrect weight was verbally confirmed and entered into both pilots’ electronic flight bags. Since both devices used the same wrong figure, cross-checks matched and masked the error. No comparison was made with the loadsheet or FMC data. The consequences were immediate: • Reduced thrust setting • Invalid performance solution (“V SPEEDS UNAVAILABLE”) • Rotation and V-speeds far below safe values Correct speeds should have been approximately: V1 ≈ 172 knots VR ≈ 181 knots Instead, rotation began around the mid-140 knot range. The aircraft pitched to 8.3° nose-up within seconds. Tail-strike protection activated, but the tail contacted the runway at about 160 knots. By then the aircraft had passed the (incorrectly calculated) V1, making a rejected takeoff impossible. A third pilot in the cockpit called for full TOGA thrust roughly 12 seconds after rotation began. The aircraft finally lifted off at 178 knots with only ~800 metres of runway remaining, crossing the opposite threshold at just 155 feet. The crew declared an urgency, dumped 72 tonnes of fuel and returned safely. All 398 occupants were unharmed. The event was later reclassified from serious incident to accident due to structural damage found during inspection.

Turbine Traveller

101,771 просмотров • 6 месяцев назад

The first maglev train in China with a speed of 600 km/h, with the code name CF600-0001, has shown its majesty under the lens of railway photographers. This maglev train is a major breakthrough for China's railway, marking a new advancement in high-speed rail technology. A maglev train is a high-speed train that utilizes electromagnetic force for levitation and is propelled by magnetic power, capable of traveling at astonishing speeds on maglev tracks. The CF600-0001 is China's first maglev train with a speed reaching 600 kilometers per hour, drawing global attention due to its high speed and advanced technology. The design of this maglev train incorporates the latest materials and techniques, including lightweight alloys, carbon fiber, and other high-strength materials, ensuring stability and safety during high-speed operation. Additionally, advanced control and power systems guarantee the train's high-speed operation and comfort. The successful research and operation of maglev trains by China's railway will bring revolutionary changes to high-speed railway transportation both domestically and internationally. This will not only significantly reduce travel time, but also promote the internationalization and globalization of China's high-speed rail technology. Railway photographers have captured the magnificent sight of this maglev train through their lenses, allowing people to witness the new achievements of China's high-speed rail technology and showcasing China's leading position in the field of transportation and logistics.

Johannes Maria

57,724 просмотров • 1 год назад

😓 Air India 🇮🇳 Flight AI171 with fully loaded Boeing 787-7 Dreamliner fatal accident: I‘m an airline pilot with >15‘000h of experience and a physics institute: My brief PRELIMINARY analysis of the visible facts from the video of the takeoff: * The flaps are only slightly extended, presumably to position 1 instead of 5. * The landing gear is still extended, which should have been retracted at this altitude and causes additional drag. * The aircraft is at a high angle of attack, which confirms the insufficient flap setting. * From the video and witness accounts, only low engine noise is audible. * Neither smoke nor fire is visible. * An engine failure is less likely. The most probable cause is presumably a human factor, an incorrectly chosen, insufficient flap setting for takeoff, and consequently an inadequately selected thrust. In this context, the correlated speeds were too low because they were calculated for a larger flap setting or a lighter aircraft. As a result, the aircraft took off with insufficient speed and intentionally but falsely derated thrust, was therefore on the unstable side, and rapidly lost more speed and altitude due to the additional failure to retract the landing gear in a timely manner, leading to a subsequent stall at low altitude and crash. For the experts: the aircraft got onto the wrong side of the speed vs drag curve and maneuvered itself into a corner from where there is no escape. Another possible cause could also have been an incorrect input of a wrong takeoff weight into the Flight Management System, resulting in too low thrust and too low speeds. The pilots got startled after takeoff, couldn’t wrap their head around what went wrong and incorrectly prioritized making an emergency call instead of flying the aircraft first, manually increasing thrust immediately to maximum, and retracting the landing gear. In summary of this very early and preliminary assessment (your confidence level should be as low as mine): The most probable cause is human error 😓 - as most of the time these days. Not because the pilots got worse (although that effect can be observed as well with prioritization of diversity over competence) - but because technology got so much better.

Iven‘s Dad

2,786,743 просмотров • 1 год назад

UPDATE: Charlie Kirk 🚨 Muzzle Flash: Second Shooter Location, Reflection, or Both? This video captures a flash on a window right as Charlie Kirk was shot. Let’s break this down… follow the numbers on the videos. #1. This video shows what appears to be a muzzle flash, just as Charlie is shot, leading people to believe the shooter was to Charlie’s right.. Notate the people to the left of the flash #2. This photo shows the location of the flash. Notate people to the left, on a middle-landing on a staircase. #3. This photo shows a clearer image showing both the middle-landing and the same location of the flash. It is a window. #4 . This video shows the building behind Charlie, which is a long hallway. This debunks any claims the shot came from here. — I zoom in where Charlie was — I zoom in on staircase — I zoom in on the window/flash — I zoom in on where suspected shooter was #5. I notate the flash reflection angles. — Video angle #1 notated — two reflection paths notated in relation to Video angle #1. 1. Reflection angle shows where we were told the shooter was. 2. Reflection angle shows mirrored angle, obviously where there is no reports of a shooter being in. 🔻 Final conclusion: This to me is very likely a muzzle flash reflection from a far off location. I am unsure of the reflection angle however, but this can be 100% proven if someone were to recreate the angles… maybe with a flash camera. If anyone is willing to, or has the means to do this (safely), this will either prove the shot came where the FBI said it came from, or it will prove there was a second shooter, in the direction of the mirrored angle.

MJTruthUltra

10,665,164 просмотров • 10 месяцев назад