Voepass #8203 ATR-72 Loss of Control Sao Paulo Brazil 9 Aug 2024

breaking news out of South Pao Brazil where an atr72 has gone down today Friday the 9th of August here's what we know so far starting with the aviation safety Network Friday 9th of August 1322 local time and ATR 72- 212 V pass Airlines 62 fatalities 62 occupants on board aircraft destroyed near Vigo a vot pass Airlines ATR 72- 2112a better known as an atr72 -500 performing flight as um the local flight Airlines flight number 2283 became uncontrollable and crashed near Vigo Sal Paulo all 58 passengers and four crew members perished and the aircraft was destroyed online videos showed the aircraft in a fully developed spin with little to no forward speed before it impacted a residential area and burst into flames and there's multiple videos of this flat spin we'll take a look at in a moment the flight had Departed cascavella airport at 1458 universal time Bound for sou Pao International Airport the aircraft climbed to a cruising altitude of 177,000 Ft flight level 170 until adsb data showed the aircraft entering a sudden sharp descent at 1621 universal time or Zulu time the weather at cenis just 14 km away from the accident site showed at 1600 Z the winds 020 at 8 knots cavok clear weather temperature d point spread of just 17° C temperature 15° on the dupoint and then at 1632 Z shows the winds 360 at 7 wind still out of the North 4,000 in light rain and Mist again the temperature 17° 215° if we look at Google Earth we can see a line of weather a large line of weather moving through the area at the time of the accident Sal Pao being located right here and of course it's below the Equator so it's winter time down there here on the Weather Channel they're showing a bit of weather moving through the area 65° fah and cloudy if we look at the data on flight aware we can see the aircraft is cruising at a 177,000 ft altitude and then the air speed drops off and the aircraft begins a spin from about 16,000 ft total aircraft control is Lost based on the solid line on the altitude we can assume that the autopilot was on there were um variations in the speed of the aircraft in this data and if we look at the more granulated data we can see the ground speed in knots in this column here and ground speed in miles per hour in this column here cruising along at 177,000 FT IFR flight plan and ground speed maintaining about 300 mph ground speed and then the ground speed slowing to 241 m an hour or 209 knots at 16,000 ft a slight descent from 17,000 ft to 16,000 ft and then the air speed just drops right off and the rate of descent just exceeds 11,000 ft per minute the aircraft is in a spin from 16,000 ft there are numerous videos of the final moments of this flight showing the aircraft clearly in a spin a fairly flat spin and if you listen to the audio it sounds to me like both engines were running and at some point here the crew did elect to pull the power back on the engines it sounds like to [Music] [Music] me the final flat spin as seen from another angle and another angle [Music] here so apparently because the aircraft was spinning down from such a high altitude plenty of people were able to capture the final moments on their cell phone here's yet another [Music] angle here's an an angle that captured the spin from pretty early on sounds like two [Music] engines and it sounds to me like there was a reduction in power towards the end of the spin a photo of the actual accident an airplane the ATR and as mentioned many times on this channel if you get one of these multi-engine aircraft into a spin it's very very difficult if not impossible to recover the aircraft from the spin there's simply too much mass with the two engines outside of the center of rotation of the aircraft to stop the rotation of the spin plus the configuration of this tail and the angle of attack that that that tail is experiencing specifically the rudder during the spin gives him very little Rudder authority to recover the aircraft from the spin and the first step to any sort of a flat spin of course is you've got to reduce the power the power is what's keeping the nose up on the horizon and making the spin flat this photo comes to us via jet photos and is the photo on the Flight Radar 24 site investigators will be looking at the configuration of the aircraft at the time of the accident since it was still in Cruise flight at 17 or or 16,000 ft it's more than likely that the flaps were up retracted and the gear was also retracted accident investigators are going to be looking very closely at the weather in this situation and specifically icing conditions initial reports do seem to indicate that there's the possibility that severe icing conditions did exist at the time of this accident and these turboprop aircraft are particularly susceptible to airframe icing primarily because of their mission they are cruising at 7 17,000 ft right in the icing conditions especially in southern latitudes in the winter time and warmer climates um airliner regular airliners the larger airliners we will Cruise well above the freezing level up 30 to nearly 40,000 ft above the clouds above the freezing conditions but the turbo props are stuck smack dab right in the middle of it and here in the ATR icing manual it tells you that right away that flying in icing conditions is a serious threat operating in hot countries does not prevent one from encountering icing conditions 30° at sea level means that 0 deg Celsius is at flight or at 15,000 ft your standard adiabatic lapse rate due to prevailing atmospheric conditions that they operating flight levels turbo prop aircraft fly where icing conditions are most likely to occur and one of the worst kind of icing conditions that Pilots need to be concerned with in these areas and flying these kind of aircraft are super large super cooled water droplets the impact of flying in icing conditions in the ATR is similar to that of other aircraft you lose lift you increase your drag you lose performance on the aircraft and you alter the handling behavior of the aircraft now the ATR like all airliners has anti-icing and deicing systems on board the aircraft to handle normal icing conditions but if you get into severe icing conditions you are in a emergency situation because this is such a critical situation in the ATR you are giving a given a severe icing emergency checklist it's a box checklist which means this checklist needs to be memorized and you need to quickly perform these tasks from memory minimalizing speed increase by 10 knots power management go to MCT or Max continuous thrust condition lever prop lever 100% Max continuous thrust trust autopilot if engaged firmly control firmly hold the control wheel and disengage remember the comment about handling icing conditions can get the aircraft severely out of trim severe icing conditions Escape you've got to get you've got to vacate that altitude before it's too late ATC notify let them know that you're in severe icing conditions don't wait for a clearance to leave the icing conditions just escape and get out of the icing conditions and if we take the KML data into Google Earth we can see that the aircraft lost control very quickly after a short descent from 177,000 Ft to 16,000 ft and the spin began so these are some of the things that investigators will be looking at and what we know so far about the loss of the ATR aircraft in South Pao Brazil today thank you so much for your support of this channel especially the folks over on patreon that make this content possible see you here here [Music]