C-DRONE GUIDE · 26 JULY 2026
Cable car and ski lift drone inspection: pylons, cables, stations, price
A chairlift or gondola is not inspected like a building: the haul rope, pylons and stations fall under one of the strictest regulatory regimes in France, overseen by STRMTG. Yet between two ten-yearly major inspections, the operator still has to monitor day to day the condition of a line that can climb several kilometres and several hundred metres of elevation — a long exercise on foot, and limited by what the eye can make out from the ground. The drone finds a precise place there, complementing the certified controls: photographing every pylon from every angle, thermographing station motors, documenting a suspect anchor point, all during a line shutdown arranged with the operator. Here is what a drone can and cannot do on a cable transport installation, and 2026 prices.
Published on 26 July 2026, reviewed on 27 July 2026 — regulations in force as of July 2026.
What STRMTG already requires — and what the drone does not replace
French cable cars, gondolas and chairlifts are among the most tightly controlled transport infrastructures in the country: STRMTG (the French technical service for cable transport and guided transport) oversees their design, operation and maintenance through technical guides RM1 and RM2, compliance with which presumes conformity with the decree of 7 August 2009 (decree of 9 August 2011 for drag lifts). Every installation undergoes an annual inspection — brakes, safety devices, apparent condition of equipment — then, at statutory intervals (15 years, then every 5 years for most installations, drag lifts excepted), a major inspection with non-destructive testing after certain components are removed. Since the decree of 19 January 2016, every operator also maintains a safety management system (SGS) covering its entire fleet.
The drone plays no part in any of these statutory obligations: testing the haul rope itself — magnetic-flux leakage, broken-wire counts — remains the job of certified inspectors using the methods set out by STRMTG, and no text provides for replacing it with an aerial inspection. Its place is complementary: documenting visually and thermally, between two major inspections, what the operator already monitors itself — the condition of pylons, anchor points and stations — at a frequency and resolution that foot patrols cannot always match over a line spanning several kilometres and hundreds of metres of elevation.
What the drone documents: pylons, cables, stations, cabins
On a pylon — a lattice or tubular steel structure continuously exposed to frost, humidity and the salt spray of high-altitude stations — the drone documents corrosion on welds and bolts, flaking paint, and any deformation of a cross-brace after a heavy snowfall or impact: exactly the kind of defect an operator must report between two major inspections. Automated corrosion quantification on lattice steel structures from drone imagery is a recent research field: a study by Savino, Graglia, Scozza and Di Pietra published in 2025 in Computer-Aided Civil and Infrastructure Engineering showed that a convolutional neural network trained on drone photogrammetric surveys can automatically quantify corroded surface area on electricity transmission towers — a method directly transferable to cable-car pylons, which share the same exposure and the same lattice geometry (see the study on Google Scholar).
On the rope itself, the drone does not replace magnetic-flux testing but documents what remains visible: the condition of the sheaves at each pylon, apparent wear on the rope shoes, cleanliness of the groove, and the absence of any trapped foreign object. The upper and lower stations call for a use closer to a standard industrial building inspection: thermography of motors, winches and electrical cabinets, the condition of the roof and frame, and a visual check of cabins and their hangers in maintenance position — a mechanic close to the one detailed in our PV plant thermography guide, applied to a station's electromechanical equipment.
A mission built around the off-season and the line shutdown
Unlike an inspection of a live power line, a flight above a cable car is negotiated with the line stopped: the operator parks the carriers in station or along the line as needed and controls the flight over the cables, which remain an aerial obstacle even at rest. The preferred window is the off-season — after winter closure, before summer opening, or vice versa — when the line is already down for routine maintenance anyway: the drone flight then adds no extra downtime cost. An in-season visit is still possible, but requires a dedicated shutdown, usually early morning outside operating hours, which adds to the price.
Preparation pairs the remote pilot with the line's technical manager: identifying which pylons to examine first (those already flagged at the annual visit), take-off points compatible with the route's topography, and checking the exact height of the resting cables, which varies with temperature and load. The flight itself follows the route pylon by pylon rather than a continuous pass: every anchor point and every sheave assembly is photographed from several angles, with station thermography carried out separately, away from any cable movement.
The flight framework: mountains, cables, coordinating with the operator
The mission takes place in an environment already covered by our drone in the mountains and national parks guide: national park core zones often closed to overflight, altitude that reduces flight endurance and calls for a cold-adapted aircraft, and systematic checking of the very-low-altitude military network (RTBA) and altiport restricted zones on Géoportail. Cable-car ropes, precisely because they are a common hazard for any drone flying in the mountains, become here the very subject of the mission: the remote pilot knows their exact position before take-off, an advantage a leisure flight passing nearby by chance does not have.
Coordination with the operator is not limited to stopping the line: on a ski resort, it also includes informing the piste service and, in winter, checking that no avalanche risk restricts access to the foot of the pylons for the ground briefing. On an urban or tourist installation outside a ski resort (an urban cable car, a lowland tourist site), the mission is closer to a standard telecom tower inspection, with a standard DGAC declaration and fewer seasonal constraints.
Observed prices in 2026
Ranges observed in 2026 (excl. VAT) for a typical installation (10 to 25 pylons):
- Targeted visual check (a few already-flagged pylons, outside a dedicated line shutdown): €400 to €900.
- Full line inspection (every pylon, visible cable and anchor point, during the off-season): €2,000 to €4,500 depending on the number of pylons and elevation change.
- Station thermography (motors, winches, electrical cabinets): €600 to €1,200 per station.
- Photogrammetric survey of the route (renewal or extension file): €1,500 to €3,500.
An in-season line shutdown, outside the off-season, generally adds an early-morning mobilisation fee. For a cable-transport company managing several installations on the same resort, grouping inspections into a single off-season campaign markedly cuts the unit cost. Request a quote stating the installation type, number of pylons and the planned off-season window.