Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
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Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
Wonder what was going on with the 732 in the video. Looked like it was just sitting there with nose gear in the grass close to the runway.
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
Looks close enough to super typhoon Meranti.
Edit:
There's a report out from a year earlier Aug 28 / 2015 of similar left side gear collapse on a 737 blamed on winds .. same airport / direction. Says there pilots aim to be down early ... only about a mile
Edit:
There's a report out from a year earlier Aug 28 / 2015 of similar left side gear collapse on a 737 blamed on winds .. same airport / direction. Says there pilots aim to be down early ... only about a mile
Last edited by pdw on Wed Sep 14, 2016 3:46 am, edited 3 times in total.
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Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
Variable tailwinds caused the gear to collapse?pdw wrote:Looks close enough to super typhoon Meranti.
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
From another forum they are saying there are no instrument approaches into that airport and the ceiling at the time was below 200'.
Let’s Go Brandon
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
There's an RNAV 15, CAT A and B only, with minimums 1033' AGL.....
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
Aiming to pound down early on the shorter runway often (previous accident report) there is metal fatigue to consider, seeing it's the second occurrance like that in one year.
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Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
Looks like he was on a taxiway waiting to backtrack and line up - very fortunate they were going straight!FL410 wrote:Wonder what was going on with the 732 in the video. Looked like it was just sitting there with nose gear in the grass close to the runway.
@PDW
Super Typhoon Meranti is at least 1500nm away from this airport (just using difference in latitude x 60).
Metal fatigue?
or
-The usual Indonesian unstabilised approach (Go -around is a loss of face in this culture).
-High Speed
-High rate of descent
-Hard landing (the photos on Avherald appear to show that).
-Gear collapse
Which do you think is more likely?
Always fly a stable approach - it's the only stability you'll find in this business
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
Gannet167, is there a link to the RNAV 15? I'd like to have a look even though I'm sure the 733 is a Cat C. Thank you.
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
This is the only one I can find. 5988' X 98' runway.
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Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
737-300 isn't certified for RNAV (GNSS) approaches.Gannet167 wrote:There's an RNAV 15, CAT A and B only, with minimums 1033' AGL.....
Always fly a stable approach - it's the only stability you'll find in this business
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
You must mean this operator isn't certified for RNAV approaches.Eric Janson wrote:737-300 isn't certified for RNAV (GNSS) approaches.
Because both the Classics and Jurassics can be certified for RNAV approaches, at least in Canada.
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
Ok so .. witness says: slight turn to line up, then some pitch down short final (av herald source); before/at touchdown was seen very nose high. Seems to be a slow airspeed touchdown? Negligeable winds / wx hist Wamena .. although favours reciprocal around 5kts ( GS at beginning of long slideout is touchdown-AS plus 5).Eric Janson wrote:-High Speed
-High rate of descent
-Hard landing (the photos on Avherald appear to show that).
-Gear collapse
Which do you think is more likely?
High rate of decent induced only the last 200ft or so (if witness account is accurate)
Extreme nose high during the hard landing .. so that stance tilts longer gearlegs a bit forward (not a straight down force on them then) so they break easier ? NoseWheel touches down after main impact (a light touchdown) so nosegear ok and could be used as steering straight ahead.
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Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
Have a good look at the video in full screen at high resolution - specifically between 5 and 8 seconds.pdw wrote:Seems to be a slow airspeed touchdown?
Nothing low speed about that or the subsequent slide along the runway!
Always fly a stable approach - it's the only stability you'll find in this business
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Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
I did some checking and I see you are correct - the 737-300 can be upgraded with GPS receivers and an updated FMC which will give RNAV(GNSS) capability.Donald wrote:You must mean this operator isn't certified for RNAV approaches.Eric Janson wrote:737-300 isn't certified for RNAV (GNSS) approaches.
Because both the Classics and Jurassics can be certified for RNAV approaches, at least in Canada.
The 737-300's that I flew did not have this capability. I don't remember ever flying an overlay type approach - all strictly raw data.
Given the cost of retro-fitting vs. the residual value of the airframe I doubt Trigana Air did any modifications.
Always fly a stable approach - it's the only stability you'll find in this business
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
No, except does it look a bit faster there than it's really going ? Maybe a bit of an illusion too ...so close to the camera.Eric Janson wrote:Nothing low speed about that
Once the eye faces west (at the 5 second mark there on the video) the plane is already sliding for 8 seconds / already down for a few sec before it comes into view behind the other AC .. maybe 2-3 sec before start of the vid.
Say IAS is 62-64m/sec (125kts) the second it's witnessed nosehigh/hard on the threshold (basically stallspeed no ? ); have to add 5 knots there (2-3m/sec) for groundspeed / wx hist Wamena Airport Sept 13/2016 7:30am / rwy 15
Can't see it being more than 50 meters per second there (100kts) once abeam at the 5 second mark. By the 6sec mark: 47m/s, 7sec: 45 m/s, 8sec: 42m/s (80kts) or something close; hope to see a report with some details.
Never seen a slider quite like that ... and where having the moist pavement is such a lucky thing.
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Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
@pdw
Look at the video again. Just above the 737-200 waiting to backtrack.
At 5 seconds you can see the Trigana 737 emerging from the (low) cloud. After that you can see them make a course correction followed by a dive for the runway.
Look at the video again. Just above the 737-200 waiting to backtrack.
At 5 seconds you can see the Trigana 737 emerging from the (low) cloud. After that you can see them make a course correction followed by a dive for the runway.
Always fly a stable approach - it's the only stability you'll find in this business
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
When I click on the Video it's not airborne ... just shows sliding
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Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
Always fly a stable approach - it's the only stability you'll find in this business
Re: Trigana Air Boeing 737-300F skidded off the runway at Wamena, Papua (video)
There it shows the turn with rapid descent initiation from level at MDA (see chart).
At 14 sec there's sudden movement inside cockpit of the crossways plane (shocked pilots) and below workers break into a run to see, which is a reaction to the accident point.
The rapid descent onset is obvious as it comes into view in this video, just like the accident pilots see the rwy come into view out of their windscreen. Arresting an increased descent rate in the nose high flair raises stallspeed. Any onlookers, including the video camera, see only the visual speed not the invisible airspeed which here is less than GS (initial wx-hist check). What would the IAS be ... if descent not arrested at nose-high ?
For GS, the first ~ 8 seconds of slide-out is a total distance of ~ 640 meters, the distance from the threshold to the ramp on which the crossways AC is parked (videos). Figuring out precise airspeed at point-of-accident (on first contact with threshold pavement) is the more difficult calculation ... more info needed.
At 14 sec there's sudden movement inside cockpit of the crossways plane (shocked pilots) and below workers break into a run to see, which is a reaction to the accident point.
The rapid descent onset is obvious as it comes into view in this video, just like the accident pilots see the rwy come into view out of their windscreen. Arresting an increased descent rate in the nose high flair raises stallspeed. Any onlookers, including the video camera, see only the visual speed not the invisible airspeed which here is less than GS (initial wx-hist check). What would the IAS be ... if descent not arrested at nose-high ?
For GS, the first ~ 8 seconds of slide-out is a total distance of ~ 640 meters, the distance from the threshold to the ramp on which the crossways AC is parked (videos). Figuring out precise airspeed at point-of-accident (on first contact with threshold pavement) is the more difficult calculation ... more info needed.