737-300 runway excursion at Osh, Kyrgyzstan

[readywhenreaching]

looks like another 737 oldie bites the dust
http://www.jacdec.de/WP/wp-content/uploads/2015/11/2015-11-22_EX-37005_B733_AviaTRaffic@Osh_ACC3.png
jacdec.de (http://www.jacdec.de/2015/11/22/2015-11-22-avia-traffic-boeing-737-300-seriously-damaged-on-landing-at-osh/)

AvnSafetyNet (http://aviation-safety.net/wikibase/wiki.php?id=181569)

[Johnny F@rt Pants]

EX-37005 737-300 Gear collapse on landing (http://www.b737.org.uk/incident_ex37005.htm)

What were they doing continuing an approach to landing??

[Hotel Tango]

What were they doing continuing an approach to landing??

Looking at the fuel gauges??

[CaptainSandL]

Update on this just released by the Russian CAA…

The crew went around from their first ILS approach due to lack of visual references. They decided to divert to their alternate (i.e. return to Bishkek) but soon after received indications of the failure of the right hand engine combined with the failure of two hydraulic systems. The crew shut the right hand engine down and decided to perform an emergency landing in Osh despite weather being below minima.

The aircraft touched down very hard about 1400 meters past the threshold of runway 12, the gear collapsed and the aircraft skidded on its belly and engines to a halt 500 meters further down the runway. The occupants evacuated via slides, 10 occupants received injuries of various degrees, 4 received serious injuries.

Full details here (http://www.b737.org.uk/incident_ex37005.htm)

The heavy landing now seems more understandable if they were trying to shoot an ILS in 50m of fog, engine out and in manual reversion.

[Johnny F@rt Pants]

If you ever did that in the sim it would be described as a combination of events that would never ever ever ever happen.

[CaptainSandL]

I agree and I suspect that it did not happen. The engine failure maybe but to then be followed by a double hydraulic failure is statistically highly unlikely. I suspect a mis-diagnosis or incorrect reporting.

[MATELO]

Uncontained engine failure leading to the disabling of the systems along the lines of Qantas 32 could be a possibility.

[CaptainSandL]

The plot thickens, this from AvHerald:

On Dec 10th 2015 a reader pointed out a misinterpretration of the Russian original of Dec 7th pointing out that the first approach on the accident flight was not aborted due to lack of visual reference but following a hard touch down on the runway that collapsed the gear. A subsequent remark by Rosaviatsia (CAA), not fully comprehended initially, then makes clear, that the subsequent engine failure and dual hydraulic failure were the result of that first hard touch down and damage received.

[golfyankeesierra]

Well what is it now?

"engine fails on airplane causing hard landing"
or
"engine falls of airplane after hard landing"
..?

[pattern_is_full]

Both - there were TWO hard touchdowns.

First hard touchdown led to a rejected landing, and plan to divert, but then damage from that landing resulted in subsequent in-flight engine/hydraulic failure, so they made second (emergency) landing (also hard, breaking gear, sliding off runway) at same airport.

Your confusion understandable, though. An unusual series of events, explained through double translation.

EDIT - actually, it is still unclear to me which of the two landings resulted in the gear failure. Perhaps the 2nd landing, after engine/hyd failures, was a belly-landing.

[PersonFromPorlock]

Perhaps the 2nd landing, after engine/hyd failures, was a belly-landing. The photo at the top of the thread shows the nose gear door open, so probably not.

[CaptainSandL]

Flightglobal now reporting a more coherent account of what happened..

Flightglobal Dashboard (http://dashboard.flightglobal.com/app/#/articles/419973?context=newsstream)


Investigators have revealed that a Kyrgyz-operated Boeing 737-300 suffered landing-gear damage in a hard touchdown at Osh before executing a missed approach.

Despite the impact the aircraft became airborne and started diverting to Bishkek but returned to Osh when it began suffering other system failures.

The damage sustained by the undercarriage during the first landing attempt meant the landing-gear subsequently collapsed when the aircraft touched down at Osh for the second time.

Russian air transport regulator Rosaviatsia states that weather conditions at Osh, which has a Category I instrument landing system, were below minima with runway visibility down to just 50m.


it goes on..

Rosaviatsia says the aircraft experienced a rough touchdown and the crew aborted the landing, choosing to divert to Bishkek.

But during the diversion the crew encountered signs of system failure in the starboard CFM International CFM56 engine as well as hydraulic problems.

Rosaviatsia states that the pilots shut down the powerplant and opted to return to Osh for an emergency landing – in spite of the poor weather.

The aircraft suffered a landing-gear failure on touchdown which, says the authority, indicates that the undercarriage had been damaged during the first landing attempt.

[Volume]

more coherent...and more scary as well!
suffered landing-gear damage in a hard touchdownbroke off all 3 landing gears...

There are still too many different versions of the accident around to be sure what really happened.

[JammedStab]

Hmmm...50m vis. Isn't this now considered to be less than CAT IIIB.

[Skyspirit]

Dual hydraulic failure will result in complete loss of:
1. Ground spoilers
2. Inboard flight spoilers
3. Outboard flight spoilers
4. Autopilot A
5. Autopilot B
6. Yaw damper
7. Normal brakes
and
8. Alternate brakes

and together with one engine inoperative, in RVR 50m fog visibility...even if you have operative and good gears, this is CRASH landing!

Only God can save you this day!
Compliments to pilots and eagerly waiting for the report...

[Aluminium shuffler]

Yaw damper works with the standby hyd system. It's lost when using the A system. Still, the point is moot; more relevant is why the hell they chose to make that first approach which resulted in them crashing on two landings.

[jmmoric]

Out of curiosity, with a decision height at 161' agl, which I suppose it is on a Boeing 737, how many feet will you stray below that height when commencing a missed approach at it?

Most likely not 161'+ to severely damage your gear, but anyway, what can you expect when handled normally?

[Skyspirit]

If weather at OM was at minimums approach was expected. Now we must wait to find out what was at RA 200ft...

But after GA this is great job!

Nearby Fergana airport (55nm or so) weather was at RVR 1500m, but dont know for weather minimums

edit: Also weather in Osh, when they first goes to alternate Bishkek, was ~ RVR 500m so I think they are conservative and thoughtfull crew

[Buster11]

While I have no hands-on experience of aircraft maintenance, the appearance of the detached gear leg is not what I would expect to see on an aircraft that had been regularly loved and cared for. Any comments from those who know?

[FlightDetent]

, but anyway, what can you expect when handled normally? 17 feet seems to ring a bell from an LVP course long time ago. Currently rated 737 driver required to confirm, minimum approach break-off height is the name.

fd.

[Aluminium shuffler]

If it was a CatI approach, the lowest height above the threshold a GA should have been started is 200', not 161, and quite possibly higher depending on the airport lighting and and obstacles. Penetration of the DA wouldn't exceed 30', and I'd expect it to be about 20' if initiated promptly.

[jmmoric]

I thought this was the correct chart for the approach?

http://www.kan.kg/ais/eaip/aipcharts/ucfo/UC_AD_2_UCFO_12_ILS_DME_2NDB.pdf

Maybe I'm reading it wrong then?

Ref the post below, and not to sidetrack the thread:

I think I see the difference, it's between AD elevation and THR elevation?

[FlightDetent]

Chart is correct, OCH 161 feet. There is a marked difference between OCH and DH. In this, thorougly normal and usual case, the lowest DH available to crew is 200' above THR ELEV. See for instance EKCH ILS 22L from AIP, OCH 152 feet.