The Pre-Winter Commissioning Sequence
Before any lift opens to the general public, it undergoes rigorous operational recommissioning. Over the summer, parts may have been disassembled, wiring checked, and grips stored in dry bays. Bringing the lift back to dynamic line operation requires a stepped checklist that leaves nothing to chance.
The sequence usually moves through three defined stages:
- Static Alignment and Visual Sweeps: Ensuring tower access ladders, safety safety cables, catwalk anchor points, and break-fork switches are clear of summer construction detritus and brush growth.
- Dry Unloaded Runs: Spinning the line at slow speed for several hours to warm lubricants, verify sheave tracking, and check current draw across the electric drive inverter.
- Full Dynamic Load and Brake Testing: Simulating worst-case uphill loading using water bladders or concrete test weights placed on carriers.
Load Testing: Simulating the Worst-Case Descent & Ascent
Why do we load test? Because an empty lift behaves entirely differently from one loaded with eight hundred skiers. Under heavy uphill loading, the tension carriage reaches its forward travel limit, cable sag deepens on long spans, and drive motor torque peaks.
During pre-season certification, technicians test all emergency stops under load:
- Service Brake Stop: Measuring deceleration rates to confirm the brake does not violently jolt carriers or slip under heavy load.
- Emergency Bullwheel Brake Drop: Simulating high-speed loss of primary drive to confirm mechanical clamping time and brake shoe friction coefficients.
- Diesel Evacuation Auxiliary Drive Test: Engaging the secondary diesel or hydrostatic evacuation engine, disengaging the primary gearbox, and running the loaded line to prove passenger clearance capability during a total resort grid power blackout.
Practical Reality: A backup engine that hasn't been load-tested under cold conditions is not an evacuation system; it's wishful thinking. Run your auxiliary motors under simulated line loads, check cold-cranking battery amperage, and test fuel gelling additives well before December.
Combating Rime Ice and Freezing Weather
Ice is the mortal enemy of aerial ropeways. When supercooled cloud droplets freeze onto tower sheaves and haul ropes, several hazardous conditions occur:
- Grip Slip: Ice build-up on the haul rope reduces the friction coefficient between the grip jaws and cable wires, increasing the risk of a carrier sliding backwards on steep pitches.
- Sheave Battery Derailment: Ice bridges forming in the grooves of sheave wheels can force the traveling rope up and over the retaining flanges.
- Switch Freezing: Break-pin switches on towers can be glued shut by rime ice, preventing them from breaking if a genuine line derailment occurs.
Pre-season readiness requires testing all de-icing scrapers mounted on tower sheaves, checking heating elements installed on anemometers and terminal track switches, and stocking specialized non-corrosive de-icing fluids approved by the ropeway manufacturer.
Thorough Pre-Season Benefits
- Confident opening day operations without embarrassing false trips.
- Verified backup power systems ready for severe winter storms.
- Staff familiarized with emergency protocols and hand signals.
- Smooth sign-off by municipal and regulatory safety inspectors.
Rushed Opening Consequences
- Mid-mountain stoppages in sub-zero blizzard conditions.
- Damage to haul rope strands caused by running through frozen sheaves.
- Unprepared lift operations crews fumbling evacuation procedures.
- Severe reputational brand damage and guest compensation costs.
Staff Operational Drills and Training
Even the most robust mechanical systems rely on human oversight. Pre-season is the prime opportunity to drill lift operators and mountain ski patrol teams on rope-evacuation techniques, line-clear procedures, carrier spacing verification, and manual stop protocols. A machine is only as dependable as the crew holding the radio.