Angara Airlines An-24 landing accident at Nizhneangarsk

[UltraFan]

Originally Posted by Tu.114

Unfortunately, technical drawings of the An-24 are hard to come by

If you read Russian, I can give you the link to An-24 technical description on airdocs. LMK

[Tu.114]

@Ultrafan, that would be appreciated.

[aerolearner]

Originally Posted by Tu.114

@Ultrafan, that would be appreciated.

http://aviadocs.com/RLE/An-24/StartDisc_An-24.pdf

For other aircraft types:
aviadocs.com - /RLE/

[UltraFan]

Originally Posted by Tu.114

@Ultrafan, that would be appreciated.

The link above is what I wanted to post. Which is great because, as it turns out, I cannot post links until I have 10 posts. Well, you have it now. Enjoy. It's a wonderful flight manual. It even explains why it's worse when the right engine is inop.

[paulross]

Some analysis of the available video

Some analysis of these videos is over here: https://github.com/paulross/pprune-c..._Nizhneangarsk

Summary:

• The aircraft approaches at a ground speed that varies between 161 and 180 knots.
• It crosses the threshold at 172±4 knots.
• Touch down is at 164±4 knots, 549±14 m down the 1653m runway (about 1/3 the way down). Acceleration is -1.1 m/s^2 .
• At t=36.0 the aircraft starts drifting to the right, possibly due to a burst tyre. The aircraft is 731±16 m down the runway travelling at 159±4 knots.
• The aircraft departs the runway at t=46.1 s, 1463±41 m down the runway at 114±6 knots. Acceleration is -3.9 m/s^2 .
• At t=56.1 the aircraft hits the boundary fence 200m beyond the end of the runway at around 37 knots. This collapses the starboard undercarriage (and probably the port one as well).
• The aircraft would have slid to a stop roughly 45m later unfortunately there was a building 36m beyond the boundary fence which it hit at somewhat less than 18 knots.

[oleczek]

Pretty accurate as far as distances go

Actual figures - page 46 of Preliminary Investigation (in Russian) https://mak-iac.org/upload/iblock/b5...a-47366_pr.pdf

[paulross]

oleczek

Thanks for that, I didn't realise that anything had been published yet. And the speeds roughly correspond, from the radar plot on page 15 the ground speed was around 96 m/s / 187 knots over the last 30 seconds of the approach (I compute around 90 m/s / 175 knots). It also seems that they had a tailwind of 4 m/s / 8 knots which obviously did not help.