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Chair down on Gunbarrel, Thredbo?

Discussion in 'Thredbo' started by azzski, Jul 22, 2019.

  1. telecrag

    telecrag Old n' Crusty Ski Pass: Gold

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    I think I know who you mean, first chairer (deathbarrell) pretty quick, had a fair bit to do last summer in Perisher?
     
  2. Ozgirl

    Ozgirl A Local Ski Pass: Gold

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    Blame KT for lack of info.

    Speculation is rife in the absence of fact!
     
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  3. gareth_oau

    gareth_oau Pool Room Ski Pass: Gold

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    Sorry I was talking post incident.

    I’m not qualified to discuss operational maintenance.

    But I do accept Force Majeure
     
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  4. Nicko4334

    Nicko4334 Hard Yards

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    His title is GM, but he IS an engineer. For good reason. Very reassuring to know he was on the ground on the day. I presume the grip and chair etc were also in the workshop.

    FWIW, engineers are rarely titled "Engineer". It's a contentious issue. Historically steam train drivers and steel fabricators were/are called engineers.

    Cableway installs are not an everyday occurrence so it makes sense to not be geared up for that and bring in the skills as required.
     
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  5. Ozgirl

    Ozgirl A Local Ski Pass: Gold

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    HE WASN'T

    IT WASN'T

    You do know there is 30mins between Jindy and thredbo don't you?

    The workshop is in Jindy.
     
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  6. Nicko4334

    Nicko4334 Hard Yards

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    I meant the Dop boss from Jindy whom I'm presuming is closest to KTs information black hole.
     
  7. telecrag

    telecrag Old n' Crusty Ski Pass: Gold

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    I think that is the person yes.
     
  8. chicski

    chicski A Local Ski Pass: Gold

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    FB reminds me that today is the 3yr anniversary of drop no 1.
     
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  9. Nicko4334

    Nicko4334 Hard Yards

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    Agreed. I've had to debate FM incidents. But howling strong winds in the mountains, including willy willys, is a very forseeable event.

    There was a ripper down near yarrangobilly village a few years back.
     
  10. Nicko4334

    Nicko4334 Hard Yards

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    Its only 12 minutes if you're a P PLater in a 20 year old Honda I've noticed
     
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  11. telecrag

    telecrag Old n' Crusty Ski Pass: Gold

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  12. Snow Blowey

    Snow Blowey Old n' Crusty Ski Pass: Gold

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    There is no uncertainty. Chair strikes tower puts bending force on detachclamp from 3m away. That's lots of bending force and it's enough to overcome clamp. Anyone that's used a crow bar will know you can break shit with a 3m bar.

    Circumstances which made this happen include poorly loaded chair which increased chance of chair striking the tower.
     
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  13. telecrag

    telecrag Old n' Crusty Ski Pass: Gold

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    Act of God.
     
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  14. cold wombat

    cold wombat Twitter Contributer Social Media Mod Ski Pass: Gold

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    I can.

    ;)
     
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  15. cold wombat

    cold wombat Twitter Contributer Social Media Mod Ski Pass: Gold

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    Are you trying (in vain, just to be clear) to claim responsibility?
     
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  16. gareth_oau

    gareth_oau Pool Room Ski Pass: Gold

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    Refer the bible thread. That covers EVERYTHING
     
  17. skinavy

    skinavy One of Us

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    Thredbo has a position titled ENGINEERING GROUP MANAGER. Responsibilities include maintenance of all on mountain infrastructure and vehicles, along with sewerage plant and maintenance of Thredbo property within the village (reason I know, I considered applying for the job in 2014) Requirements included tertiary engineering qualifications.
     
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  18. skinavy

    skinavy One of Us

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    Been a qualified engineer for over 20 years and worked pretty continuously in engineer roles. Only three jobs have had engineer in the title.
     
  19. D-eye

    D-eye Photographer and skier Moderator

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    Only another 25 pages or so to go, unless it gets too unruly and shouty, then it will be closed instead.
     
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  20. linked_recoveries

    linked_recoveries One of Us

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    Swapping out the grips for something more modern would require the top and bottom stations to be completely re-engineered. I expect the cost of that would get up there close to the cost of replacing the stations entirely. Not impossible of course, and the ropeway companies offer that service, but it might make more sense to replace the chair.
     
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  21. Nicko4334

    Nicko4334 Hard Yards

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    W
    We haven't even started on the incipient spin characteristics of a chair in full flight. @skinavy You may commence... ;)
     
  22. climberman

    climberman CloudRide1000 Legend Ski Pass: Gold

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    Like his own council engineer! Does seem to pull rank and get the snow clearer with heating though.
     
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  23. linked_recoveries

    linked_recoveries One of Us

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    We've discussed 'spin characteristics' of another sort though.
     
  24. Nicko4334

    Nicko4334 Hard Yards

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    Same.
     
  25. kylep

    kylep One of Us Ski Pass: Gold

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    How about this
     
  26. Nicko4334

    Nicko4334 Hard Yards

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    Anyone in charge of the sewage system should get to pull rank!!
     
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  27. Legs Akimbo

    Legs Akimbo Grumblebum Ski Pass: Gold

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    And we are back to peak farrago.
     
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  28. skinavy

    skinavy One of Us

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    Most of my aerospace stuff is either in accident investigation, Airworthiness regs or guided weapons (I know wierd combo). However I don't think a chair (laden or unladen)has much in the way of lifting or control surfaces. Probably too difficult to work out what conditions it would spin at. Stall speed would be probably 0kt IAS.
     
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  29. Nicko4334

    Nicko4334 Hard Yards

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    We surely have. It's just that only 3 days ago I was listening to the stall warning alarm go off in a very small aircraft at 1200ft and....never mind.... i've digressed
     
  30. Nicko4334

    Nicko4334 Hard Yards

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    Mmm, steep glide path I'd imagine.

    Most of my aeropsace stuff is in how carrots become projectiles after too long spent pre flight at the coopers alehouse

    I have a coupla mates with similar cv's to yourself. Weaponry and ballistics certainly puts an interesting slant on fluid dynamics. More interesting than sewage systems at least!
     
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  31. Alleve

    Alleve Hard Yards

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    Fun ride for the kids
     
  32. Alleve

    Alleve Hard Yards

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    Depends on the problem with the grips. If there is a design flaw, then yeah a redesign would be necessary and a new lift wouldn't be a bad idea. If the problem is simply age reducing the ability of the grips to stay closed after force is applied/poor maintenance and not a design flaw, then a new grip design wouldn't be necessary; only new grips of the same design.
     
  33. Snow Blowey

    Snow Blowey Old n' Crusty Ski Pass: Gold

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    Not many grips that will stay closed when you subject them to a 3m lever.
     
  34. Piste Ant

    Piste Ant Hard Yards Ski Pass: Silver

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    Another rumour;
    The chair swung over just before the pylon. With the forward (uphill) travel of the chair wedging or jamming it against the pylon, rotating the chair and disengaging the grip.
     
  35. Snow Blowey

    Snow Blowey Old n' Crusty Ski Pass: Gold

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    Turning the chair into a rotating lever working against a 50mm diameter clamp.
     
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  36. Nicko4334

    Nicko4334 Hard Yards

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    Funny that, given most grips have a (potential) 3m (or longer) lever attached to them most of the time.
     
  37. Snow Blowey

    Snow Blowey Old n' Crusty Ski Pass: Gold

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    Which only works against the clamp if rotational force is applied. Like chair hitting the tower.
     
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  38. Nicko4334

    Nicko4334 Hard Yards

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    A fair speculation. Either the spring and grip was forced open or the grip, under full clamp force was somehow ripped fair off the cable
     
  39. gareth_oau

    gareth_oau Pool Room Ski Pass: Gold

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    From the photos on page 1, Does the location of the fallen chair on the snow support that?
     
  40. Untele-whippet

    Untele-whippet beard stroker Ski Pass: Gold

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  41. Bogong

    Bogong Part of the Furniture Ski Pass: Gold

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    Doppelmayr-Garaventa brand grips for detachable chairs have changed quite a bit since detachable chairs were invented almost 40 years ago. Mt Buller had the 3rd and 4th detachable chairlifts in the world.

    Gunbarrel probably has the second generation 'DS series' grip. It's been almost trouble free, especially when compared with the third generation DT series grip which dates from 1995. That DT grip has actually been banned in a few countries, but it seems that the older DS grips haven't got themselves into much trouble, although they're pretty ancient by now.
    [​IMG]
    Doppelmayr DS Grip
     
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  42. Alleve

    Alleve Hard Yards

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    Yeah the Gunbarrel had DS grips
     
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  43. skinavy

    skinavy One of Us

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    Photos I saw of cable looked like the grip opened. No noticeable damage to the cable.
     
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  44. Nicko4334

    Nicko4334 Hard Yards

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    Damage to jaw?

    I can understand the jaw being ripped off given its relatively small sectional area (in any dimension), but I'm perplexed as to how the spring could be activated to release the jaw.
     
  45. Nicko4334

    Nicko4334 Hard Yards

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    Note there was a service bulletin issued about 10 years ago for faulty grip dimensions. I know Aus is out of the loop with all things alpine, but surely we got the memo??
     
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  46. skinavy

    skinavy One of Us

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    Honestly can't remember.
     
  47. skinavy

    skinavy One of Us

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    Given it carries people, I would think that service bulletins would be treated similar to those for aircraft and distributed to all operators. I'm pretty sure the actual regulatory environment is the same as for amusement park rides (unsure if good or bad in light of Dreamworld and would need to confirm)
     
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  48. azzski

    azzski Should know better Moderator Ski Pass: Gold

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    Tough to make any conclusions from that pic on the exact impact spot, as it could easily have moved post impact.
     
  49. Richard

    Richard Maintenance Dept Administrator

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    Grip failed at last pylon with roller chattering combined with the stress of that last pylons angle change with approach to bullwheel. ​

    Tensile spring in grip was both fatigued with age and incorrectly tensioned after summer mtn bike operation. ​

    I’m putting two pineapples down on this being the findings when all is said and down. But prolly won’t ever know.
     
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  50. Alleve

    Alleve Hard Yards

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    I'm guessing it's more to do with a fatigued grip failing under the stress of a heavy chair spinning after colliding with the tower. The collision was caused by the freak gust of wind.

    I dont think that mtb had anything to do with it as Gunbarrel wasn't used in 2016 when the first incident occurred