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An airplane radial engine is a powerful internal combustion engine where cylinders are arranged in a circle around a central crankshaft, resembling the spokes of a wheel. Renowned for their exceptional power-to-weight ratio and reliable air cooling, they were the dominant powerhouses of early aviation and World War II....

26,030 Aufrufe • vor 28 Tagen •via X (Twitter)

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😓 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 * The landing gear is still extended, which should have been retracted at this altitude and causes additional drag.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

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A Change of Plan…🌍 A little insight into the realities of airline flying: sometimes the route you see on your flight tracker isn’t the one we originally planned. That’s because flight planning is a mix of science, safety, and flexibility. 🌐 One reason for changes is ATC flow management. Think of it like traffic lights in the sky, with thousands of aircraft moving through shared corridors, air traffic control sometimes adjusts our routes to keep the system flowing smoothly and safely. But today’s change wasn’t about traffic. It was about performance planning. Departing Delhi, our A350 was heavy with fuel and passengers, and the original routing led straight into an area of very high terrain. With a twin-engine aircraft, we always consider the “what if”: if one engine were to fail, how would the aircraft perform? Safety means ensuring we can still fly clear of terrain even under those conditions. That’s where ETOPS (Extended-range Twin-engine Operations) and drift down procedures come in. ETOPS rules let two-engine aircraft fly long oceanic and remote routes, but only with strict planning to guarantee diversion options. Drift down is the scenario where, after losing one engine, we calculate how the aircraft can descend to a level where it can safely continue flight and clear terrain. These are baked into every flight plan, and sometimes, the numbers don’t add up and they mean taking the longer way around. So today, instead of climbing northwest out of India, we turned south. The routing took us over Oman and the UAE, up the length of the Gulf, across Iraq, and back into our original track over western Turkey. That’s also where we passed one of my favourite places: the airfield named Batman 🦇. 👨‍✈️ It’s a great reminder that flying isn’t just point-to-point. Every route is carefully designed with safety, performance, and the flow of global air traffic in mind. It also means that we had a great opportunity to get some air-to-air pics of other aircraft. Will share these during the week 🙌🏻 #AvGeek #PilotLife #AirbusA350 #FlightDeckLife #ETOPS #FlightOps #AirlinePilot #AviationSafety #ProfessionalPilot #FromTheFlightDeck #FlyingTheWorld #SingleEngineDriftDown #AviationDaily #AvgeekCommunity #SkyHighViews

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What is the RAT? The RAT is a small wind turbine stowed within the aircraft fuselage and deployed automatically when certain failure conditions are met. Once extended into the airstream, it uses the forward motion of the aircraft to spin and generate power—mechanical, hydraulic, or electrical. Primary Functions of the RAT on the 787-8 1. Hydraulic Backup Power On deployment, the RAT drives a variable displacement inline hydraulic pump. It pressurizes the center hydraulic system, enabling continued operation of critical flight control surfaces such as the ailerons, elevators, and rudder. This is vital in maintaining aircraft controllability if normal hydraulic sources are lost. 2. Supplementary Electrical Power While the RAT is primarily a hydraulic power source on the 787-8, it can also, in some configurations, drive an emergency generator. This generator provides sufficient AC and DC power to support essential avionics, flight displays, and communications systems. Deployment Scenarios: When Does the RAT Automatically Deploy? The RAT on the Boeing 787-8 deploys automatically—without crew input—under the following emergency conditions: 1. Dual Engine Failure If both engines fail, resulting in the loss of engine-driven electrical and hydraulic generation, the RAT deploys to maintain critical flight control power. 2. Complete Electrical Loss to Flight Instruments If there’s a total loss of electrical power to both the captain’s and first officer’s primary flight instruments, the RAT ensures these systems remain powered. 3. Low Pressure in All Three Hydraulic Systems If all three systems—Left, Center, and Right—lose hydraulic pressure, the RAT provides emergency hydraulic power through the center system. 4. EMP Failure + Engine Loss During Takeoff or Landing If all four Electric Motor Pumps (EMPs) fail and an engine fails during takeoff or landing, the RAT deploys to sustain flight control power during these critical phases. Automatic and Autonomous Operation One of the RAT’s key advantages is its fully autonomous activation. Pilots do not need to manually deploy it; the system is designed to react immediately to predefined failure logic, reducing workload and ensuring flight-critical systems remain powered. In Summary The Ram Air Turbine (RAT) on the Boeing 787-8 is not just a backup—it's a lifesaving last resort. It deploys automatically to supply hydraulic and limited electrical power when all other power sources fail. Designed with layered redundancy in mind, it is one of the unsung heroes of modern aircraft systems, ensuring that even in worst-case scenarios, pilots retain control to guide the aircraft—and its passengers—safely to the ground.

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