Georgian Minister of Economy and Sustainable Development Dimitry Kumsishvili held a press conference today to announce initial findings of an investigation into the rollback of a 2007 Doppelmayr quad chair at the Gudauri ski resort, which injured 11 people a week ago. French firm Bureau Veritas confirmed the lift’s initial stop was caused by a power outage. “After the chairlift was stopped, the operator had to introduce specific sequence of procedures and after implementation of the certain actions, the operator had to switch the chairlift on to the diesel generator power and bring the tourist to the safe site,” a translated press release reads. “Unfortunately, according to the current conclusion, the operator made a mistake. The combination of the actions that he should have had carried out were not implemented in compliance with the relevant instructions – it was a human error.”
The report notes the chairlift had undergone an inspection in December and was in “perfect technical order.” The operator on duty at the time has been fired and may face criminal charges at the conclusion of the investigation. The Head of Gudauri Mountain Management and Deputy Director of the Mountain Resort Development Company have both resigned in the wake of the incident. Georgia is in active talks to retrain employees from Gudauri and other ski areas, though staff had been to training courses at Doppelmayr headquarters in Austria in 2017 and Poma was on site offering training opportunities as recently as January. The government says there are 15 total chairlifts in the country that are “in line with the world’s advanced standards.” A statement from Doppelmayr linking to the release notes, “We hope that the injured persons are getting well soon. This remains the most important point at the moment.” According to Minister Kumsishvili, all of those injured have been released from hospitals and invited to return to ski next year for free.
While we in North America were sleeping, a serious lift incident unfolded in the Caucasus Mountains, where Europe and Asia meet. Videos posted to YouTube and Facebook show a Doppelmayr fixed-grip quad picking up speed in reverse and chaos ensuing on an already crowded powder day. Any riders who didn’t jump were thrown from the lift at the drive bullwheel or pinned between mangled chairs. Georgia’s Ministry of Economy says eight people sustained non life-threatening injuries.
Another picture shows chairs piled up after the lift came to a stop on what would normally be the arrival side of the drive station. Some grips held on while others were ripped from the haul rope after going around the bullwheel.
From looking through Doppelmayr Worldbooks, I believe the lift in question is called Sadzele, built in 2007 as one of six lifts at the Gudauri ski resort. Note that fixed-grip lift models Doppelmayr sells in the U.S. and Canada differ significantly from those found in Europe and elsewhere.
Christmas Day ski lift evacuation on Bromley Mountain – A lift shut down at Bromley Mountain Ski Resort in Peru, Vermont, on Christmas Day 2017. Crews worked high winds and cold temperatures to evacuate skiers from the chairs. Video courtesy of Dougla… https://t.co/a7sODHBHXH
None of the 115 skiers and snowboarders riding the Sun Mountain Express at Bromley Mountain, Vermont were injured yesterday despite a serious wind-related incident. The Burlington Free Pressreports a gust caused at least one empty chair to contact a communications line while the lift was moving. “The cable snagged a grip on an empty chair, derailing it and causing the lift to stop,” the paper wrote. It’s not clear from the article whether the snagged grip and chair remained on the haul rope. Bromley’s Assistant General Manager Michael van Eyck commented to the media, “a super high 20 or 25 second burst of wind” led to the accident. “The winds were not predicted to be that high,” he noted. A rope evacuation was initiated following the deropement, which took two and a third hours to complete.
The Sun Mountain Express is a mile-long detachable quad featuring torsion grips built in 1997. The Doppelmayr lift services the vast majority of Bromley’s terrain and remained closed the rest of Christmas Day and this morning. The mountain’s snow report currently reads: “the Sun Mountain Express will be on a delayed opening schedule today, while it undergoes some maintenance. Stay tuned for updates on its projected opening time, but our lift crew is working hard and should have it up and running by this afternoon.” Poor Bromley also lost its primary snowmaking pump house to fire just ten days ago. The family-focused ski area is owned by the Fairbank Group, which also operates Jiminy Peak, Massachusetts and Cranmore, New Hampshire.
Multiple mediaoutlets are reporting chairs full of skiers and snowboarders slid into each other near the top of Tussey Mountain, Pennsylvania today, the first day of the season for the area. It appears four grips slipped down the haul rope and were stopped by a fifth grip and chair. All of the chairs were occupied but thankfully, injuries to five people are being described as non-life threatening. Passengers on the entire lift were brought down by rope. A spokesman for the mountain told CBS News that an operator manually stopped the lift, which is a 1982 Borvig center pole model and one of two Borvig chairlifts at the ski area near State College.
Borvig brand lifts have been involved in at least six recent incidents including a deropement causing serious injuries at Sugarloaf in December 2010, a rollback at the same mountain in 2015, a tower separation in West Virginia in February 2016 and a foundation grout failure at Sunday River later that year. Also in 2016, two chairs slid into each other on a relocated Borvig double at Granite Gorge, New Hampshire, sending two people to the hospital.
I was expecting a typical recently-lost ski area scene as I drove toward Northeastern Oregon this morning. Located in the Blue Mountains where Idaho, Oregon and Washington converge, Spout Spring Ski Area once featured three Hall lifts: two doubles and a T-Bar. When I arrived at the first lift, called Echo, I was pleasantly surprised at the shape it was in, looking as if it had operated this season with ANSI signs neatly stacked and chairs flipped. After all, it has only been 15 months since these lifts hauled skiers.
Next I rounded the corner to the base-to-summit Happy double, which looked anything but happy. Surveying the scene above, I instantly assumed vandals had somehow knocked over the building that houses the 1965 double chair’s bottom drive bullwheel. But another clue was all around me. The massive snow load from this winter in the Blue Mountains was probably too much for the almost 55-year old building to handle. Not only did it fall on top of the terminal, wood got hung up in a chair which bent like a pretzel and caused the light side to de-rope in two places.
The Colorado Passenger Tramway Safety Board released its 151-page final report on last December’s fatal accident at Granby Ranch this afternoon. The investigative team included seven professional engineers with more than 250 years of combined lift experience with support from Leitner-Poma and Granby Ranch personnel, among others. The team conducted extensive tests on the Quickdraw lift from the afternoon of the accident through January 5th and spent months writing this detailed analysis, identifying contributing factors and making recommendations for changes. Appendices include witness statements, photographs and prior inspection reports but the core of the document is 13 pages which everyone who works on ski lifts should read. I’ve done my best to summarize below.
Chair 58 contacted tower 5 at a 40-degree angle that morning due to two contributing factors. The first was the tuning of a new drive installed last Fall by an independent contractor. Two specific parameters may have created pulses of energy and rope instability, the report notes. “It is probable that the combined effect of [these two settings] may have resulted in the drive trying to respond too aggressively to lift demands when changing from ‘Fast’ to ‘Slow’ and back to ‘Fast’ again.” The second contributing factor was the influence of one or more speed changes leading up to the incident.
Other potential contributing factors were:
Control system complexity resulting from the new ABB DCS800 drive’s interface with older Pilz/Leitner low-voltage controls.
A control board replacement from February 2016.
Possible damage to the electric motor encoder.
Unknown electrical cycle shown in data logs that had occurred at a 3.7 second interval over the entire life of the lift.
Tension factor(s) that would require more testing to determine.
Natural instability of the profile. “There appears to have been a very unique combination of rope tension, carrier spacing, tower spans, tower height, carrier loading and natural carrier movement that led to the transverse carrier swing that resulted in Carrier 58 hitting Tower 5,” the document states.
Natural harmonic response of the haul rope.
Wind was not found to be an outside influence, nor was passenger conduct. “The incident that occurred on December 29th, 2016 at Granby Ranch was unprecedented,” the investigative team wrote. “Although many factors may have combined to amplify the effect of the rope instability leading to Carrier 58 colliding with Tower 5, the performance of the new drive is considered to be the primary cause of the incident.” The report explains electronic drives such as the DCS800 added to Quickdraw last year and used on many lifts are also used in a wide variety of other applications. The tuning and “fine-tuning” of a drive is complex and unique to each application and lift. “It appears the new drive was not comprehensively tuned to this particular lift during installation,” the document says.
Loveland Ski Area has closed its two oldest chairlifts – Lifts 1 and 6 – following discovery of similar problems at each. Lift 6 is a 1977 Lift Engineering double chair that closed in the middle of the day on Sunday, January 15th due to a problem at the top terminal. Lift 1 is a 1981 Lift Engineering triple that operated until an inspection found the early stages of a similar issue today (interestingly, Lift 1 opened as a double chair before being upgraded with larger chairs a few years later.)
“We are dedicated to safe lift operations and have decided to close Lift 1 to immediately perform the necessary repairs,” Loveland said in a statement this evening.
While Loveland’s social media posts do not specify what is wrong, they say repairs to Chair 1 should take about two days with Lift 6 taking longer. Both chairs are bottom drive/bottom tension, so the list of things that could go wrong up top is limited. In the meantime, the mountain is offering $51 discounted tickets.
For the first time in 24 years (and post-Lift Engineering) an electrical or mechanical problem has led to a fatality on an American ski lift. The Quickdraw quad at Granby Ranch will re-open Tuesday after the Colorado Passenger Tramway Safety Board reached an interim operation agreement with the ski area. The news comes almost two weeks after the December 29th accident, in which a mother and her two daughters fell from a chair. Unfortunately, the agreement notes that a “rare dynamic event” due to issues with the electronic drive/control system caused the riders’ fall. Environmental factors, weather and/or rider behavior were not to blame.
The Colorado Department of Regulatory Agencies, which oversees the tramway board, conducted extensive testing in addition to interviewing witnesses and engineers over the past 10 days. Mother Kelly Huber and her two children were riding chair number 58 when it came into contact with tower 5 due to irregular line dynamics. The lift had been load tested less than four weeks prior, on Dec. 5th.
The operation agreement with the CPTSB is stringent. Quickdraw’s electronic drive must be disconnected (this particular lift has two diesels – auxiliary and evacuation.) Lift mechanics, operators and ski patrollers all must perform a line check prior to operation each day. Additional visual line and ground checks will be required to be documented every two hours. For the first three days, the lift will only be permitted to move 600 feet per minute, even though the diesel auxiliary is rated for up to 900 fpm. After two additional days at 700 fpm, Granby Ranch will be permitted to operate the lift at 800 fpm for the rest of the season. Presumably this summer the lift will get a completely new drive.
The operation agreement is not a final report and does not identify any acts or omissions leading up to the accident, but merely outlines the conditions under which the lift can re-open. In a press release dated today, Granby Ranch echoed its condolences to the family of the victims and affirmed its commitment to safety. “The Quick Draw Express has been operating safely at Granby Ranch over the 16 seasons since its installation,” the company noted. “Granby Ranch has followed all prescribed protocols in operating the lift.”
We haven’t heard the end of this one. Hopefully the final report will provide some insight into how this type of event can be avoided in the future.
Update 1/10/17: Apparently a third-party company installed a new ABB drive last summer that ramped up and/or down too quickly, leading to the dynamic event.
Tragedy struck yesterday at Granby Ranch, Colorado during what is normally a celebratory week at American ski resorts. A 40-year old woman and her two daughters, ages 9 and 12, fell from a chair on the Quickdraw quad at approximately 9:30 am. Kelly Huber, of San Antonio, Texas died, while one of her children remains in stable condition at a Denver hospital. The older sister was treated and released. In a statement today, the resort noted, “All of us at Granby Ranch are deeply saddened by yesterday’s tragic incident at our resort. We extend our heartfelt condolences to the family of our guests. Our focus right now is on supporting those affected by this tragedy.”
Quickdraw is one of only three Italian-built Leitner detachable chairlifts in the United States, debuting at Granby Ranch in 1999. Leitner and Poma merged their North American operations in 2002. While some reports indicate the lift stopped frequently before the accident, those of us who work around lifts know that is not unusual this time of year and often not due to any mechanical problem. There’s no indication the detachable grip failed and the fourth spot on the chair was apparently empty. Quickdraw’s chairs are equipped with both restraining bars and footrests. The Colorado Passenger Tramway Board is investigating and Quickdraw remained closed today.
According to the NSAA, the last fatal fall from a U.S. chairlift occurred on December 18, 2011 at Sugar Bowl, when a 7-year old boy fell 60 feet. Non-deadly falls are more common, however, with 227 reported in Colorado alone between 2001 and 2012. 86 percent of those were found to be a result of rider error, with 4 percent due to medical problems and just 2 percent attributed to operator/mechanical issues (the rest were never classified.) Yesterday’s accident was the first deadly chairlift fall in Colorado since 2002, with 1.7 billion safe rides in the years between, according to Colorado Ski Country USA.
Nevertheless, as I write this, a family is in mourning and the story occupies the fourth spot on CNN.com. With more holiday weeks to come, let this terrible accident be a reminder that no matter how statistically safe they are, ski lifts can become dangerous in an instant. Already this year, we’ve seen falls from chairs at Mt. Hood Meadows, Seven Springs and Whistler with near misses at Sundance and Mt. Ashland. Many more never make the news. Be safe out there – especially with kids on lifts.
A truly bizarre incident came to light tonight when Sunday River revealed the top terminal of its Spruce Peak Triple chairlift slid downhill and flipped on its side over the weekend. Scott Crowell, the resort’s lift maintenance manager discovered the damage on Sunday. From the pictures, it appears the foundation and return bullwheel moved together, with the tension of the lift and gravity sending the line to the ground. Thankfully, the lift does not operate in the summer and no one was injured.
According to Weather Underground, Bethel, Maine received nearly an inch of rain in the four days leading up to the discovery of the damage. Sunday River said the lift in question was last load tested in Fall 2015.
Spruce Peak is one of two Borvig triples remaining at Sunday River and its second oldest lift, built in 1986. Chairkit added a loading carpet at the bottom station in 2014. Spruce is 4,382 feet long and rises 1,211 feet with 17 towers and 177 chairs. In a statement, Sunday River noted, “Decisions on repairing or replacing the lift have not been made at this point and will depend on several factors, including the results of the investigation. The resort is committed to moving forward as quickly as possible.” The mountain is working with its insurance company, Willis MountainGuard, and state investigators. Presumably there is still time to get a brand new lift built in time for the coming 2016-2017 winter season if the order is placed soon. Alternatively, a lift manufacturer could come in and replace just the top terminal and any damaged chairs. Continue reading →