Search found 85 matches

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by airplanecrazy
Sun Jun 06, 2021 8:27 pm
Forum: Civil Aviation
Topic: F9 runway excursion at DCA
Replies: 32
Views: 8398

Re: F9 runway excursion at DCA

But looking at the ADSB website provided I don’t think it’s accurate as to when touchdown was. It shows on ground at 97kts. More then likely it happened around the midpoint of the runway. I would agree with that. It is interesting, however, how much further down the runway the F9 aircraft was when ...

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by airplanecrazy
Sun Jun 06, 2021 1:53 pm
Forum: Civil Aviation
Topic: F9 runway excursion at DCA
Replies: 32
Views: 8398

Re: F9 runway excursion at DCA

Three things I noticed when looking at the ADSBExchange data is that the aircraft approached the landing threshold at around 160 knots, that the QNH was set to 1014.4 hPa, and the aircraft reported being on the ground after the runway 15/33 intersection Two other A320 aircraft that landed just prior...

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by airplanecrazy
Fri Mar 12, 2021 4:20 am
Forum: Technical/Operations
Topic: ADS-B NACv
Replies: 5
Views: 941

Re: ADS-B NACv

What's even more surprising to me is that most GA aircraft are < 3m/sec, which is better than the majority of commercial aircraft! I'm speculating here, but if the system does not receive velocity data directly, but rather computes it from positional data, and given that the faster something moves,...

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by airplanecrazy
Fri Mar 12, 2021 1:21 am
Forum: Technical/Operations
Topic: ADS-B NACv
Replies: 5
Views: 941

Re: ADS-B NACv

What's even more surprising to me is that most GA aircraft are < 3m/sec, which is better than the majority of commercial aircraft!

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by airplanecrazy
Fri Mar 12, 2021 12:17 am
Forum: Technical/Operations
Topic: ADS-B NACv
Replies: 5
Views: 941

Re: ADS-B NACv

GalaxyFlyer wrote:
What is NACv?


It is a value that tells how accurate the ADS-B velocity data is. My understanding is that a NACv of 0.3 m/sec says that 95% of the time the velocity will be 0.3 m/sec of the published velocity.

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by airplanecrazy
Thu Mar 11, 2021 9:24 pm
Forum: Technical/Operations
Topic: ADS-B NACv
Replies: 5
Views: 941

ADS-B NACv

I have been observing the ADS-B NACv (velocity figure of merit) for a number of aircraft on https://globe.adsbexchange.com/ . Most commercial aircraft show a value of "< 10 m/s", but some aircraft show values of "< 0.3 m/s" (which is more what I expect, to be honest). The aircraf...

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by airplanecrazy
Thu Jan 28, 2021 6:44 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

You might recall the YouTube reconstructions of the crash I created last year using the ADS-B and ATC comms data. I haven't done much with N72EX lately, but I decided to do some follow up investigation yesterday. To my surprise, in December the NTSB posted to the docket the data extracted from the F...

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by airplanecrazy
Wed Aug 26, 2020 3:49 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

True, no argument, just pointing out ATC can’t provide terrain clearance below the MIA. What if the answer to your first question is NO? ATC can’t help or Pilot lies. Scudrinners Anonymous here. In his statement to the NTSB the controller (CO) said: Group: You have seen the media reports I am sure ...

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by airplanecrazy
Wed Aug 26, 2020 2:33 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

I published a crash reconstruction a couple of months ago with the full ATC audio I obtained from the FAA for the last minutes of flight (see link https://www.airliners.net/forum/viewtopic.php?f=3&t=1439861&start=737#p22223107 ). I am not a pilot or controller, but I have a hard time finding...

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by airplanecrazy
Tue May 19, 2020 12:38 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

Below is a copy of the Airworthiness documentation for N72EX. I bought it so I could see what kind of Transponder and ADS-B equipment was installed.

https://1drv.ms/b/s!Ai5ul4veNOgHiYlBhJG8CblFCNa9rA

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by airplanecrazy
Mon May 18, 2020 5:36 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

Here is my take of the transcript on frequency 134.2, SoCal Approach Burbank Sector Pilot: [17:40:06] SoCal, Helicopter 7 2 Echo X-Ray with you transitioning in VFR conditions at one thousand five hundred to Camarillo. Controller1: [17:40:17] Helicopter 7 2 Echo X-Ray SaCal Approach, Roger. You just...

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by airplanecrazy
Mon May 18, 2020 2:19 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

The FAA sent me SoCal Arrival ATC communications that I requested through a Freedom of Information Act (FOIA) request. I have time aligned this new audio to my reconstruction efforts.
Image
https://youtu.be/M_Dpm144KXo

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by airplanecrazy
Sat May 09, 2020 5:44 pm
Forum: Technical/Operations
Topic: GPS and WAAS
Replies: 6
Views: 1053

Re: GPS and WAAS

. Unless there's a specific mention of, for example, "NACp > 10" in the datasheet or handbook, the only thing you know for sure is that the device complies with FAA regulations. For the GTX 335 that appears to be NACp >= 8, i. e. 92.5 m. Anything else is just marketing. . For the flight I...

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by airplanecrazy
Sat May 09, 2020 1:50 pm
Forum: Technical/Operations
Topic: GPS and WAAS
Replies: 6
Views: 1053

Re: GPS and WAAS

Adam, I am also seeing some disagreement between some of the altitude reports and some of the vertical rate reports. Do you have any intuition/knowledge about which reports would be more accurate? If I "integrate" (add up) the vertical rate reports I eventually get to the same final altitu...

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by airplanecrazy
Sat May 09, 2020 1:10 pm
Forum: Technical/Operations
Topic: GPS and WAAS
Replies: 6
Views: 1053

Re: GPS and WAAS

There's no simple answer to that, I guess. So, based on my own experience (I've been running fleet position monitoring solution on trains professionally), you can quite easily get about 3m accuracy for 98% of position reports on multi SatNav, and around 10m based on only one network. Back in the da...

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by airplanecrazy
Fri May 08, 2020 9:09 pm
Forum: Technical/Operations
Topic: GPS and WAAS
Replies: 6
Views: 1053

GPS and WAAS

I am looking at some ADS-B data and I have some questions about positional accuracy that I am hoping someone on this forum is knowledgeable enough to answer.. The Garmin website https://www8.garmin.com/aboutGPS/waas.html says that with WAAS the Estimated Position Uncertainty(EPU) is typically less t...

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by airplanecrazy
Mon Mar 02, 2020 2:30 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

I've decided to pull the video until I do a more through validation that the Tacview tool I am using to calculate the g force is accurate. Thank you for your engineering critique! I think that your video is (was) very interesting "as is", possibly with a simple warning that the g force ma...

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by airplanecrazy
Wed Feb 26, 2020 8:21 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

The simulation already convinced me that this was spatial disorientation, the detail of the pilot's looking down to the console tends to add to that. You might be interested in my most recent analysis. [...snip...] I'm a bit puzzled by the relationship between "g" numbers and roll angle. ...

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by airplanecrazy
Wed Feb 26, 2020 5:40 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

The simulation already convinced me that this was spatial disorientation, the detail of the pilot's looking down to the console tends to add to that. You might be interested in my most recent analysis. https://youtu.be/v2V7cUoA_UA http://i3.ytimg.com/vi/v2V7cUoA_UA/maxresdefault.jpg

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by airplanecrazy
Tue Feb 18, 2020 5:13 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

OK, I know it's enough already, but I made another version of my helicopter crash reconstruction :) I have been learning how to generate better clouds and scenery in X-Plane, and I thought the improvements were enough to warrant another version. Just don't click on the link if you had enough of this...

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by airplanecrazy
Thu Feb 13, 2020 6:12 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

Did you have to manually specify the roll angle? X-Plane generated the roll angle. I used the X-Plane generated roll angle in my Google Earth Studio reconstruction. I also now realize that I didn't look at the roll angle for the last moments of flight and it is over the 63 degrees I said in the vid...

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by airplanecrazy
Wed Feb 12, 2020 9:39 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

wow, these reconstructions keep getting better, top notch work! Thanks! How did you generate the x-plane path? Were you able to directly import the kml into x-plane? A long answer to a short question. Bottom line, it was a fair amount of work and analysis. I first integrated and time re-sequenced t...

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by airplanecrazy
Tue Feb 11, 2020 11:33 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

I think this will be my last attempt at my amateur reconstruction of the crash, at least until we get new information. This reconstruction now has an animated helicopter using the X-Plane simulator and my representation of the fog bank. http://i3.ytimg.com/vi/WirfErQb-sg/hqdefault.jpg https://youtu....

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by airplanecrazy
Sat Feb 08, 2020 4:23 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

For what it's worth, I created my rev3 version reconstruction of the crash based upon information gleaned from the NTSB update. https://i9.ytimg.com/vi/2tVngcxaADA/mqdefault.jpg?time=1581135624474&sqp=CPDt-PEF&rs=AOn4CLAnWxoGcnPDiI21nytCp1XfD7QfPw https://youtu.be/2tVngcxaADA

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by airplanecrazy
Fri Feb 07, 2020 7:38 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

flybucky wrote:
hOMSaR wrote:
Great point about the sound delay, I did not consider that. I should go back and recalculate some numbers.


If you do recalculate, please post your recalculated value when you are done... I would like to include it in the next iteration of my crash reconstruction. Thanks.

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by airplanecrazy
Fri Feb 07, 2020 7:36 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

Are there more doublette data sets available? If you mean are there more doublets in the FR24 granular data, I believe I have found 5 in the last minute. I also found something else in looking through the FR24 data. I think what happens is that each receiver has a state for each ICAO, and the recei...

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by airplanecrazy
Wed Feb 05, 2020 5:26 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

There have been a lot of questions about the fog ceiling level at the crash area. The METAR from Van Nuys or Camarillo is not helpful since weather in the mountains can be totally different than in the flat valleys. I found a video from a Nest webcam aimed pretty much toward the crash site and show...

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by airplanecrazy
Wed Feb 05, 2020 3:38 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

1) Are the timestamps in the video calibrated to the same clock/precision as the timestamps in ADS-B? ADS-B data messages are not timestamped by the sender (which was a huge surprise to me). The timestamps you see are timestamped by each receiver, so the accuracy and precision of the timestamp is d...

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by airplanecrazy
Tue Feb 04, 2020 2:25 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

Here are some Google Earth pictures of my reconstruction: https://bn1305files.storage.live.com/y4matUg10d9wx_toVF7ARVCos2Q3UMcZppeBUfNYyY-rmZs8YeX0qpAMC1rNPDbXy8UlLKykd6BlRGWhgezKu_Dw7e_epEtSVwgf9p_xiOsGyBaOT1UcI81WSLF6-U2tREOEIaAhp1SbKHON0IUN8UDgHXc8msSLWh7mANbwKwAoWnV-R7O3qh4ODvZDsrKYCkso0SfEAul6J...

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by airplanecrazy
Tue Feb 04, 2020 4:02 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

I can't seem to make the flight path match the debris field unless I put in a tighter left turn at the end. Nice work! I think your path is realistic (a decreasing radius descending turn). That's what I was imagining too. Could you also post a zoomed out view of your path, starting from when it div...

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by airplanecrazy
Tue Feb 04, 2020 3:26 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

The sharp white line you drew should probably be a wider fuzzy line to better reflect the uncertainties. This does not detract at all from the great job you did: your 3D reconstruction is the key part, then we can all tweak it at the margins based on our ideas and preferences. Thanks for your analy...

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by airplanecrazy
Mon Feb 03, 2020 4:08 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

[...] Do you think I need to adjust either the primary impact point to the right or adjust the approach angle (or both)? If I move to the right at all I will hit the simulated tree on the ridge immediately before impact. I would try a little bit of both, but not in the sense that you are wrong and ...

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by airplanecrazy
Sun Feb 02, 2020 11:35 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

@airplanecrazy -- yes, truly impressive! In a previous post you pointed out that you had to put in a tighter left turn at the end to match the debris field. Does your latest reconstruction include that final tighter turn? From your picture it would seem that the estimated trajectory could be moved ...

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by airplanecrazy
Sun Feb 02, 2020 7:47 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

I have been continuing my amateur efforts at crash reconstruction. I will reiterate that I know that I am not with the NTSB and that they will bring much more sophisticated analysis, but I thought the members of this forum might be interested in my efforts. I appreciate any suggestions for improveme...

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by airplanecrazy
Sat Feb 01, 2020 1:20 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

I can't seem to make the flight path match the debris field unless I put in a tighter left turn at the end. Nice work! I think your path is realistic (a decreasing radius descending turn). That's what I was imagining too. Could you also post a zoomed out view of your path, starting from when it div...

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by airplanecrazy
Fri Jan 31, 2020 11:57 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

I have been learning how to use Google Earth Studio and have been trying to fit the publicly available data to reconstruct the last moments of the crash. As others have noted, this is purely amateur work and has none of the sophistication or expertise that the NTSB will provide (I don't even play an...

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by airplanecrazy
Tue Jan 28, 2020 8:09 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

All, I have reason to believe that the FlightRadar granular altitude data I have been using is unadjusted (the helicopter takes off from under the airport). I found another site that states that the appropriate correction is +225' ( https://forums.liveatc.net/atcaviation-audio-clips/26-jan-kobe-brya...

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by airplanecrazy
Tue Jan 28, 2020 2:31 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

I zoomed in on the Google Earth plot near the end of the flight and I see the track going backward two times. Does anyone know where the GPS antenna is on that helicopter? I see the going backward phenomena in other locations in the file. I now assume this is just a precision/accuracy limitation of...

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by airplanecrazy
Tue Jan 28, 2020 1:40 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

Below is another graph plot of the FR24 granular data that I think shows the picture better. It's the last 60 seconds of data, starting from 17:44:34.250 UTC, which is about the time that it stopped following the road and started the final climb. The climb goes pretty smoothly for the first 40 seco...

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by airplanecrazy
Tue Jan 28, 2020 12:23 am
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

NTSB says helicopter didn't have FDR or CVR.

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by airplanecrazy
Mon Jan 27, 2020 11:26 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

MontaukMonster wrote:
Why would this pilot be so reckless as to fly towards rising terrain with low visibility and low ceilings? Complete incompetence.


Or mechanical failure, or disorientation, or...

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by airplanecrazy
Mon Jan 27, 2020 10:29 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

flybucky wrote:
Would you be willing to share your KML file?


Sure

https://1drv.ms/u/s!Ai5ul4veNOgHhYlk9jfjGyiqVcvZYQ?e=3GEqVw

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by airplanecrazy
Mon Jan 27, 2020 9:03 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

Is this consistent with the "climbed to 2000, cleared a mountain by 100 ft then turned to go home at 161 knots" statements in the TMZ article above? It is more consistent with cleared a mountain pass by 100', climbed to 2000', turned to the left, then descended rapidly (to go home?) Here ...

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by airplanecrazy
Mon Jan 27, 2020 6:50 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

Very Detailed Eyewitness account of the accident I am a bit confused as to why he thought the helicopter was hovering, as that doesn't seem to be supported by the flightradar24 data. The granular data I am looking at shows greater than 100knots over the last 5 minutes of flight. Some kind of acoust...

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by airplanecrazy
Mon Jan 27, 2020 6:13 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

Very Detailed Eyewitness account of the accident I am a bit confused as to why he thought the helicopter was hovering, as that doesn't seem to be supported by the flightradar24 data. The granular data I am looking at shows greater than 100knots over the last 5 minutes of flight. Some kind of acoust...

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by airplanecrazy
Mon Jan 27, 2020 4:55 pm
Forum: Civil Aviation
Topic: Kobe Bryant killed in a helicopter crash
Replies: 835
Views: 130091

Re: Kobe Bryant killed in a helicopter crash

I found publicly published granular FlightRadar24 data published here: https://www.flightradar24.com/blog/kobe-bryant-believed-dead-in-helicopter-crash/ and used the ATSB KML Creator found here: https://www.atsb.gov.au/utilities/atsb-kml-creator/atsb-kml-creator-download.aspx to create a granular KM...

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by airplanecrazy
Thu May 30, 2019 7:52 pm
Forum: Technical/Operations
Topic: UAL 804 NRT->IAD Diversion to CLE
Replies: 1
Views: 1058

UAL 804 NRT->IAD Diversion to CLE

Twice this month I have seen UAL 804 divert to CLE due to thunderstorms at IAD. Both times, PIT was a closer airport at the time of diversion and PIT would have made the continuation flight shorter (PIT->IAD vs CLE->IAD). Why then does this flight divert to CLV instead of PIT? TIA. https://www.fligh...

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by airplanecrazy
Sat Apr 14, 2018 7:46 am
Forum: Technical/Operations
Topic: Rebooting a 787
Replies: 23
Views: 5649

Rebooting a 787

I flew on UA 924 from IAD to LHR on 4/12. While starting the push back the pilot said they received some kind of problem indicator on the battery. After a while of trying to clear the error, the pilots and mechanics decided to "reboot" the airplane (my term, not theirs) by powering everyth...

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by airplanecrazy
Sat Aug 23, 2014 5:27 pm
Forum: Travel, Polls & Preferences
Topic: Strange Routing NAX7015 LGW JFK
Replies: 22
Views: 10113

RE: Strange Routing NAX7015 LGW JFK

Is NAX prohibited from flying over Ireland? Just found out that isn't the reason by looking back at flights for past several days. <a href="http://flightaware.com/live/flight/NAX7015/history/20140821/1720Z/EGKK/KJFK" target="_blank">http://flightaware.com/live/flight/N...5/history/20140821/1720Z/EGK...

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