{"id":8511,"date":"2026-09-29T22:44:19","date_gmt":"2026-09-30T06:44:19","guid":{"rendered":"https:\/\/szlmi.com\/?p=8511"},"modified":"2026-09-29T22:52:54","modified_gmt":"2026-09-30T06:52:54","slug":"load-moment-indicator-crane-failure-lessons-fort-lauderdale","status":"publish","type":"post","link":"https:\/\/szlmi.com\/fr\/load-moment-indicator-crane-failure-lessons-fort-lauderdale\/","title":{"rendered":"Fort Lauderdale Double Crane Collapse: What a Load Moment Indicator Can and Cannot Catch"},"content":{"rendered":"

By SeeZol Editorial \uff5c Published 2026-09-30 \uff5c Category: Industry News<\/a>\u00a0\uff5c 10 min read<\/p>\n

Mention l\u00e9gale :<\/strong>\u00a0SeeZol manufactures load moment indicators, rated capacity limiters and onboard weighing systems for cranes and lifting equipment. This article was written by our own editorial team, and the products linked in the closing section are ours. All incident facts are taken from public reporting and from the official text of the cited standards; the technical analysis and opinions are the editorial team’s own and do not represent any regulator or any party involved in this incident.<\/p>\n

\"The
The incident scene on 24 September 2026 in the 700 block of Southeast 8th Street, Fort Lauderdale: the overturned boom truck in the centre, the recovery crane at left and a second company crane at right. Frame from Local 10 News (WPLG) television coverage.<\/figcaption><\/figure>\n

Lead:<\/strong>\u00a0On Thursday morning, 24 September 2026, a boom truck overturned onto a house in the Rio Vista area of Fort Lauderdale, Florida. It had been hired to swing a termite fumigation tent onto the roof. Hours later, the crane that came to lift it off the roof folded instead. Nobody was injured \u2014 the home had just finished a year of renovations and no one was inside \u2014 but two cranes ended up on the same roof, and both failures remain under investigation.<\/p>\n

Two crane failures in one day is a rare enough event that it is worth reading closely for a specific reason:\u00a0the two failures fall on opposite sides of the boundary of what a load moment indicator can see.<\/strong>\u00a0The second one \u2014 a five-section boom fully extended, lifting a load whose weight nobody had established \u2014 sits squarely inside an LMI’s range. The first one \u2014 the ground giving way under a loaded outrigger \u2014 sits outside it, and always will.<\/p>\n

That boundary is the subject of this article. It is also the thing our industry is worst at explaining, because the honest version of it is less flattering to the hardware than the sales version.<\/p>\n

1. What happened, in order<\/h2>\n
\"A
After the first failure: the boom truck lying on its side, outrigger beam and chassis exposed \u2014 the grass beneath it is where the float pads had been set. Frame from Local 10 News (WPLG) television coverage, 24 September 2026.<\/figcaption><\/figure>\n

Compiled from CBS News Miami, WPLG Local 10, NBC 6 South Florida and the lifting-industry outlet Vertikal.net:<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
Article<\/th>\nAs reported<\/th>\n<\/tr>\n
Date \/ time<\/td>\nThursday 24 September 2026. Fort Lauderdale Fire Rescue received the initial 911 call at about 09:15.<\/td>\n<\/tr>\n
Location<\/td>\nSoutheast 8th Street, Rio Vista neighbourhood, Fort Lauderdale, Broward County, Florida. WPLG Local 10 reports the\u00a0700 block<\/strong>; NBC 6, citing Fort Lauderdale Fire Rescue, reports the\u00a0800 block<\/strong>. The two accounts differ, and this article gives both.<\/td>\n<\/tr>\n
Equipment<\/td>\nA boom truck (truck-mounted telescopic crane) owned by Cooper Crane, a company based in West Park, Florida. The second machine was described as a larger boom truck \/ truck crane.<\/td>\n<\/tr>\n
Task<\/td>\nA pest-control contractor was using the crane to place a fumigation tent over the roof for termite treatment \u2014 routine work in South Florida.<\/td>\n<\/tr>\n
Failure 1<\/td>\nThe front load-side outrigger jack gave way \u2014 possibly dropping into a void \u2014 and the truck rolled over. Reporting described the stabilising footers being pulled out of the ground. The boom came down onto the roof and rear wall.<\/td>\n<\/tr>\n
Failure 2<\/td>\nHours later, while a second, larger crane was lifting the first one clear, that crane’s base boom section buckled. The recovery crane had its five-section boom fully extended and was lifting on a single line with a sling hitched midway up the fallen crane’s boom.<\/td>\n<\/tr>\n
Injuries<\/td>\nNone. The house was unoccupied; the owners had just completed a year-long renovation.<\/td>\n<\/tr>\n
R\u00e9ponse<\/td>\nHazmat crew for a diesel leak; fire inspector and city building inspector; the structure was declared unsafe; OSHA inspectors were on site speaking with workers.<\/td>\n<\/tr>\n
What follows<\/td>\nClean-up continued through Friday 25 September: crews collected spilled hydraulic fluid and brought in a large truck to dismantle and haul away the damaged equipment (WPLG Local 10). Cooper Crane engaged a specialist crew to disassemble the booms. The company said it is cooperating with the property owner, authorities and its insurer, and that it cannot comment on details while the review is under way.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

One neighbour’s comment, quoted by CBS News Miami, cuts straight to the mechanical question:\u00a0“If you looked at the way the footings were, they did not use a pad that was really large enough to spread out the space, and it wasn’t really a heavy load.”<\/em>\u00a0Whether that observation holds up will be for the investigation to decide.<\/p>\n

2. What a load moment indicator actually measures<\/h2>\n

Before the two failures can be placed on either side of the line, it is worth being precise about the instrument itself. A load moment indicator does not “sense overload” in the abstract. It performs one calculation, continuously, from measured inputs.<\/p>\n

Load \u00d7 radius = load moment.<\/strong>\u00a0The system compares that computed moment against the rated value for the configuration it has been told it is in, and acts when the two approach each other. Everything else in an LMI is packaging around those three steps: measure, compute, compare \u2014 and then warn or stop.<\/p>\n

\"Layout
How the measurement chain is put together on a mobile crane: (1) limit switch, (2) heavy hammer \/ anti-two-block weight, (3) load sensor, (4) length and angle sensor, (5) junction box, (6) display unit in the cab. Every rated-capacity figure the operator sees traces back to these six points \u2014 and to nothing below the outrigger jack. SeeZol product layout diagram.<\/figcaption><\/figure>\n\n\n\n\n\n\n\n\n
What gets measured<\/th>\nWith what<\/th>\nWhat it becomes<\/th>\n<\/tr>\n
Force in the hoist line \/ at the hook block<\/td>\nLoad sensor (load cell) in the running rope or at the dead end<\/td>\nActual load \u2014 displayed directly in tonnes or pounds<\/td>\n<\/tr>\n
Pressure in the luffing or hoist hydraulic circuit<\/td>\nHydraulic pressure transducer<\/td>\nAn indirect route to actual load, where a load cell is not fitted<\/td>\n<\/tr>\n
Longueur de la rampe<\/td>\nLength sensor on the cable reel or a draw-wire encoder on the boom<\/td>\nRadius, together with angle<\/td>\n<\/tr>\n
Angle de b\u00f4me<\/td>\nAngle sensor on the boom root or a pendulum<\/td>\nRadius and head height<\/td>\n<\/tr>\n
Computed load moment<\/td>\nDerived from the above<\/td>\nPercentage of rated capacity \u2014 the number the alarm and cut-out act on<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n
\n

\"A
A load sensor installed at the hook block of a telescopic boom. This is the one measurement point that gives a true load reading rather than an inferred one \u2014 and it is the reason an LMI can tell an operator what the load weighs during a cautious test pick-up, before the load is fully airborne. SeeZol installation photograph.<\/figcaption><\/figure><\/figure>\n

What that architecture buys, in practice, is a specific set of functions \u2014 and it is worth listing them plainly, because they define the boundary:<\/p>\n