JeJu Air Preliminary Report 27 Jan 2025

0:00 it is Monday the 27th of January my name is Juan Brown you're watching The Blanco Lio Channel we now have the official preliminary report on the jayu 737 disaster from South Korea that occurred back on December 29th killing a total of 179 people there's not a lot of new details in this report that we didn't already know but there are a few points of clarification let's check it out the aircraft involved is a Boeing 737800 model for first delivered to Ryan a in 2009 and then jayu a has been leasing it since February of 2017 the hours of the flight crew have been released the captain has a total of 6,823 hours with

0:46 6,096 hours in the 737 2559 hours as pic or his captain in the 737 and 186 hours in the last 90 days the first off has a total of 1,650 hours of which 1,339 are in the 737 within with 164 hours within the last 90 days so these sort of hours indicate just how quickly these Pilots are trained up and then put right into the aircraft that they're going to be operating for the rest of their careers so in the case of the first officer what is that just a little over 300 hours of basic flying training if these are their

1:31 actual total times and not just their time with the airline after just a little over 300 hours they're taken from a primary Flight Training sort of environment and moved right into the 737 and same thing over here with the captain if these are truly their total flying time hours with just a little less than 800 hours he was taken from his primary flying training and put into the 737 remember here in the States now with the change in the regulations they are requiring a total of 1,500 hours and an ATP rating before you can even apply to the airlines the weather at the time of the accident was good with the light winds out of 110 degrees at just two knots we

2:19 have some new pictures of the wreckage this first one of the aircraft would be traveling from left to right hitting the localizer embankment which is what destroyed the aircraft the aircraft went beyond this embankment and looks like it actually penetrated the exterior security wall to the airport as well the next two pictures show the AFT Fus LOD where the two surviving flight attendants were found and these bottom two pictures they say are engines I suppose there's an engine in there in in this picture and here you can see the damage to this engine it doesn't tell you whether it's left or right but completely impacted into the Red Dirt of the embankment of the

3:06 localizer here they review the history of the flight the flight took off out of Thailand at 0430 local time impact was around 9:00 a.m. local time total flight time about 4 and 1/2 hours at 08 5443 the flight first communicated for landing with the aircraft control tower at muan the tower cleared the aircraft to land on Runway 01 so they were shooting what appeared to be a stabilized straight in approach to Runway 01 while they were approaching the runway 01 Landing to the north the tower advised the airplane at 08575 to be cautious of Bird activity both the CVR and flight data recorder recordings stopped at 08 5850 so just 1 minute after they

3:54 received the advisory about Bird activity the data recorders quit now just 6 seconds after the data recorders quit recording they did get off a Mayday radio call I'll explain that in a minute how that works electrically on the 737 they did a Mayday times three for a bird strike during a go round so that still begs the question which came first the bird strike or the go round and the way this is written it sounds to me that they were beginning a go around or in the process of doing a go around and then struck the birds but it's not exactly clear to me in this preliminary report and this is important because

4:41 normally we are trained that if you have some sort of an engine problem on Final you just continue the straight in final and land on the one engine rather than initiate a go around and potentially exacerbate the whole situation but if this crew was already on a go around trying to avoid the birds in the first place and then struck the birds well that explains a lot the aircraft was flying over the left side of Runway 01 it turned right approached Runway 1 n to land on it after aligning with the runway Center Line the airplane belly landed without its landing gear deployed overran the runway and crashed into the embankment including the installed localizers bursting into flames in order to better understand how

5:28 the electrical system works on this 737 go back and review the missing data video I did back on well a couple of weeks ago on the 737 on this particular model of 737 the voice recorder and the the voice recorder and the flight data recorder both are powered by the main AC transfer bus number one and backed up by AC transfer bus number two so again if you lose your main AC power you're going to lose those data recorders so a couple of seconds after they lost those data recorders and which also corresponded to the loss of adsb data a couple of seconds after that they were still able to make a radio call why because if they are on Victor 1 the

6:13 number one VHF radio on the aircraft that one radio is powered by the standby DC bus so they would still have standby power even if you lost your main AC power provided by those two in driven generators the left engine and the right engine driven generator assuming of course that the Apu was off which is normally the case so here on the report they explain that again the flight data recorders and CVR they were installed but they both stopped at 85850 and the aircraft impacted the embankment at uh 0 9257 meaning the last 4 minutes and 7 Seconds were missing the airplane speed and pressure altitude

6:59 when the recorder stopped was 161 knots and 498 ft respectively now I don't know where they got the 498 ft well where did they get this data from we we derived it on our previous update just by looking at the video evidence um you could do a a distance equals rate Time Time study on the end of the runway to the point of impact and verify that well I came up with about 158 knots for the uh speed at impact in this picture here they show us where the aircraft was located when the cvrs stopped recording just short of Runway one again were they already on the go when this happened or were they still

7:46 on the straight end approach and again according to the way this report is written it sounds like they were already on the go round bird strike the pilots identified a group of birds while approaching Runway 01 and the security camera filmed the flight coming close to a group of birds during a go around both engines were examined and feathers and bird blood stains were found on each engine the samples were sent to specialized organizations for DNA analysis and they determined that the birds were ball teals now check this video out on YouTube about the ball teal Birds if we look up ball teal here on Wikipedia it says it's a form of a duck that's only about a 15 o bird but but if you look at the first video that comes up on YouTube

8:32 check this out they apparently fly in these huge flocks and this particular YouTube video ironically was filmed in South Korea so hitting a wall of these birds is much worse than just hitting a couple of 15 ounce Birds but was this enough to take out both engines we don't yet know and how thick was the flock of birds that they struck how many birds did they actually hit so the aviation Railway accident investigation board which is I assume are the South Korean authorities are going to tear down the engines and the components in depth analyze the data recorders and ATC data they're also looking at the embankment localizers and

9:18 bird strike evidence and if there's anything that comes up that needs a urgent uh safety recommendation they'll do that like the changing those local localizer BMS there in the country and the investigation will be assisted by the NTSB here in the US and the board of inquiries and Analysis for Aviation Security in France the Bae as well so as is so often the case with these preliminary reports we have more questions than we do answers at this time thank you so much for your support of this channel especially the folks over on patreon that make this content possible see you here