I was not there and do not know for sure but that is what I was told be someone on the job.

That doesn't look like that happened because it wasn't level ... that's just my opinion though.

We you might be right but that is what i was told but who knows really. Time will tell.

Unstable dunnage (too high? - not enough footprint?) , parking brake not set?  Fortunate nobody killed for sure.

Thats indeed a strange mishap.. First thought was the front legs to close to the edge but it looks like the whole pump moved more that a 1-1,5 meters forward. So maybe the parking brake thing?? But I cant realy believe that eighter. Some pumps are suposed to stand with the weels in the air so than a parking brake won't have any effect anyway..

You see tha dunnage is still there. This thing just completely slipped of its dunnage and even far further.. That right front leg is far away from the dunnage.. Very strange.. Would almost thing a readymixer crashed full speed in to the pump and pushed it..

Looks like the ground settled when he flat sticked out and it slid off the plastic pads.

I would say both dunnage and pump were not level.Look at the left front dunnage pile

 trim pipe get hung up in wall while laid flat out ??

They are the best pic's of a accident.You can see all of it. 

Just by looking at the last picture I'm wondering if the dunnage and pads for the front weren't level and the legs where sitting on a decline slope. With the boom fully stretched and full of concrete that may cause the pump to lean and slid forward. Redi mix truck might also have bumped the rear of pump and in combination with the decline sloped pads may have casued a slip forward as well. Quite a shame, thankfully no serious injuries.

The walls were kicked off using crane mats.......the pump drove to his set up on crane mats..............Why weren't crane mats put under the outriggers?           The pump is between a roadway and pond/lake.......obviously poor planning

Word is, passenger side wobble foot set on slanted pads, weight hit when stretched and pumping and walked it off of the pads. Seen this happen a couple of times with wobble feet

So why werent' crane mats used under the outriggers?   Priority #1-your own safety   Priority #2 others safety  Priority#3 meeting the contractors "schedule"

Never used plastic pads on plastic pads... woods and plastis it's ok but no more for best result used only wood and watch out on ice guys

Opened mine. Done stupid setups on occasion. I'll forward this to the guys i work with.

Thanks pumpnfinish! Better to get the truth out than let everyone use its fantasie  And indeed a good lesson.. Everyone can make a mistake. Most important is that we learn from them.

Another good example of why big booms need oilers.That extra experienced set of eyes just might have helped.Sorry to see this one happen

plastic pads , with swivel feet on outriggers are a recipe for disaster, unless the pads have a counter sunk hole for feet , they will slide off these pads ! Man I have seen seasoned operators do some not so safe set ups , not to long ago , after he had a accident , showed up and was doing exactly what happened here, I moved and relocated the pump to a safer location, bad things happen , even to experienced operators. When you get comfortable thats when accidents usually happen, respect these machines and the dangers !!!!

Beast Said it. being comfortable is very dangerous. You should always be a little nervous even if you know the machine in and out

IMO from looking at the pics --- bad ground, pads sank to the front.  before the pump fliped, the rear tires lifted off the ground or already were, so no tire brakes to help stop the slide.  pump slid forward on the stacked plastic pads.

shitty to see these pics but i learn something from them.

 Not a pro, didnt read the post's but have heard Putz'ys walk off pad's when rocking or shifting. But still not a pro. Hey AZ Pumper how youy doing.

My opinion is plastic is ok up to a 42m.. Bigger pumps should not even have plastic with them. Hard wood is the only solution..

I ran a 58 for a while and we custom made aluminum 42" x 48" aluminum pads, they was heavy 260 pounds per pad , but well worth the extra effort.

barking brake had to be on or pump will not go into pto i ran a pump like that so i know brake was on

even if your parking brake is on, the front tires still will spin. It only locks the rear tires ....

true m p but still wont go into pto without brake on

Unfortunately this was a piss poor set up or a bad job check I am sure we have all been in a situation that we should not have been in. The key is to learn from it.