C-DRONE GUIDE · 30 AUGUST 2026

Drone Helipad Inspection: Surface, Markings, Lighting and Approach Paths — Method and Prices

Twenty metres square, a large H painted at the centre, a few green lights recessed around the edge and a net stretched all around : from ground level, a rooftop hospital helipad looks like a slightly better-maintained roof slab. From the air, it is a complete aeronautical structure, subject to precise technical safety characteristics, and every one of its components — surface, markings, lighting, perimeter device, approach paths — governs whether an air ambulance can land on it at night, in the rain, with a patient on board. Nobody climbs onto that slab willingly to crawl around it, least of all during the hours when it may be needed. Here is what a drone documents on a helipad, what it does not replace, and the coordination constraint that sets this mission apart from every other roof inspection.

Published on 30 August 2026, reviewed on 30 August 2026 — regulations in force as of August 2026.

Helipad, FATO, TLOF, safety area: what exactly are we talking about

The vocabulary matters, because it designates distinct surfaces with distinct requirements. In France, the order of 6 May 1995 on aerodromes and other locations used by helicopters — still in force, amended notably by the order of 24 April 2022 — distinguishes the hélistation, an aerodrome equipped exclusively for helicopters, from the hélisurface, a location outside an aerodrome intended for occasional use. A hospital, industrial or head-office helipad falls into the first category and therefore carries a markedly more demanding technical framework.

That framework is set by the order of 29 September 2009, known in the trade as the « TAC hélistations » order, which lays down the safety characteristics applicable to the design, layout, operation and maintenance of these facilities. Three surfaces nest inside one another :

the FATO (final approach and take-off area), where the pilot completes the approach to the hover or to landing and begins the take-off manoeuvre ;
the TLOF (touchdown and lift-off area), the surface actually contacted by the landing gear — on a rooftop helipad, FATO and TLOF generally coincide ;
the safety area, which surrounds the FATO and extends at least 0.25 times the reference helicopter's largest overall dimension, never less than 3 metres. It must stay clear of obstacles, except for equipment needed for flight safety, which must be frangible and low.

To which are added, around and above, the take-off and approach paths, clear volumes whose slopes depend on the performance class adopted, and, on rooftop facilities, one or more safety devices intended to prevent people or equipment from falling — in practice the perimeter net seen ringing hospital decks. The text finally requires a surface free of irregularities detrimental to take-off or landing and able to withstand rotor downwash. In other words : everything an inspection needs to check is explicitly named.

FATO/TLOF surface and markings: what the orthophoto documents

A helipad deck ages like an airfield pavement, with its own particular stresses : loads concentrated at touchdown, freeze-thaw cycles, runoff, and, on a rooftop, the movements of the supporting structure below. A low-altitude photogrammetric flight produces a high-resolution orthophoto of the whole surface, on which cracking, crazing, delamination of resin or anti-skid paint, spalling at the deck edge, open joints, standing-water areas and poorly bonded old repairs can be read directly. The same pass documents the gutters and drainage grilles, whose blockage turns the deck into a water trap during a storm.

This is not extrapolation : crack detection on airfield pavement using small drones has been scientifically evaluated. A study by Md Abdullah All Sourav, Masrur Mahedi, Halil Ceylan, Sunghwan Kim, Colin Brooks and co-authors, published in 2023 in Transportation Research Record, compared drone-acquired imagery with conventional surveys on both flexible and rigid airfield pavements, and concluded that such data can detect and rate several families of crack-related distress (see the study on Google Scholar). We apply the same logic, on a far smaller scale, in our guide to drone runway inspection at aerodromes : a helipad is a twenty-metre runway, with the same surface requirements and an inspection budget of an entirely different order.

The markings are read from the same image, and they are often what triggers the works. The 2009 order provides for a white H on ordinary helipads and, for hospital helipads, a red H on a white cross ; to which are added the FATO circle and the indication of the maximum permissible mass, expressed in tonnes rounded up to the nearest tenth. A vertical orthophoto taken in even light shows what no oblique ground photo reveals : the actual contrast of the markings, the wear patches under the wheel paths, paint flaking off in sheets, geometry that has drifted after a partial repair. Repeated each year on the same flight plan, that image becomes the objective argument behind a repainting request.

Lighting, perimeter net, windsock and approach paths

Around the deck, four families of equipment are far easier to check from above than from below. The lighting first : the units marking the TLOF perimeter are recessed or very low, which makes them almost invisible from ground level and hard to check other than by walking the deck. An overflight immediately spots one missing, a lens fouled by atmospheric deposits or cleaning residue, a fitting loose or visibly misaligned. Mind the limit already noted : the drone records a condition, it measures neither intensity nor colour.

The perimeter safety device next — the net, on a rooftop helipad. It is there to stop people or equipment falling over the edge, which makes it a personal-safety item as much as an operational one. Its visual inspection covers concrete points : slack or torn mesh, corrosion of the brackets and anchorages, loose fixings, and above all the build-up of trapped debris in the net — leaves, packaging, gravel, pieces of insulation foam blown from the neighbouring roof. That last observation is not cosmetic : this debris is precisely what rotor downwash puts back into circulation at touchdown.

The windsock, lastly, mandatory and often forgotten in maintenance schedules, can be checked in seconds from a hover at a distance : fabric torn or faded to the point of losing contrast, seized rotation on its axis, corroded mast, lighting out of service. And beyond the deck's edge, the take-off and approach paths : these volumes must stay clear, yet they close slowly, year after year, without anyone explicitly deciding to obstruct them. A hedge of trees three metres taller, a telecom antenna installed on an adjoining building, a chiller added to a neighbouring roof during an extension, a tower crane erected two hundred metres away for six months — the photogrammetric survey and 3D model from our drone surveying and photogrammetry offer make these obstacles and their height relative to the deck tangible, which no ground patrol can honestly assess. For the specific case of a temporary tower crane, our guide to NOTAMs and temporary restricted airspace explains how such short-lived obstacles are brought to crews' attention.

FOD and rotor downwash: the risk a clean deck does not remove

The vertical downwash of a rotor on approach moves anything that is not fixed down, on the deck and on neighbouring surfaces alike. A foreign object — gravel, a piece of cladding, a sheet of insulation, a forgotten traffic cone, a contractor's tool — becomes at that moment a projectile capable of damaging a rotor, injuring a ground crew or going through a glazed roof. This is the risk the aviation community labels FOD (foreign object debris), and it is not confined to the deck itself : adjoining roofs, parapets, service gratings and nearby works areas are its main reservoirs.

Automated FOD detection by drone has been documented in airport settings. A study by Ellena Papadopoulos and Luis Felipe Gonzalez, presented in 2021 at the IEEE Aerospace Conference, evaluated a set-up combining a drone with a computer-vision model to spot debris on a runway, achieving a high detection rate and, above all, cutting the time a runway is closed compared with a conventional inspection (see the study on Google Scholar). More broadly, a study by Béla Kovács, Fanni Vörös, Tímea Vas and co-authors, published in 2024 in the journal Drones, tested several onboard sensors over an aerodrome's movement areas — infrastructure maintenance, wildlife hazard, debris detection — and documents the practical conditions of such flights in an active aeronautical environment (see the study on Google Scholar).

On a helipad the scale is different : the surface takes a handful of flight minutes, and automation adds little. The drone's contribution lies elsewhere — it widens the inspected perimeter beyond the deck, onto the neighbouring roofs and terraces nobody walks and from which most debris originates. It is the same exercise as the one described in our guide to drone roof inspection, applied this time to a precise question : what, within fifty metres, can lift under rotor downwash ?

Rooftop helipad: supporting structure, waterproofing and thermal pass

A rooftop helipad adds a dimension a ground-level pad does not have : it rests on a supporting structure, most often a steel frame cantilevered over open space, sometimes a concrete slab carried on columns. That structure is weather-exposed on every face, takes dynamic loads at touchdown, and its underside is one of the least visited places in a hospital building. The drone reaches it head-on, with no lift and no rope access : corrosion of sections and bolted connections, breakdown of the anti-corrosion coating, rust runs beneath base plates, a deformed bracket, the condition of the cable and pipe supports that often run under the deck.

The reading follows on from what we detail for aircraft hangar inspection, another large steel structure whose underside and roof can only be reached at height. The junction between the deck and the waterproofing of the supporting terrace deserves particular attention : this is where water ingress concentrates, directly above plant rooms or hospital circulation areas that tolerate no leak at all.

A drone thermal imaging pass usefully complements the visual survey on this precise point : a waterproofing defect and a water-logged patch of insulation show a thermal signature distinct from the sound build-up around them, typically during the late-afternoon cooling phase. As always, thermography guides the diagnosis without replacing it : it flags areas to probe, it does not pass verdict on a waterproofing system. On a hospital campus, this pass is readily combined with the wider campaign described in our guide to hospitals and healthcare facilities — one visit, one authorisation file, several deliverables.

Coordination with the operator, method and prices

This is the point that sets the mission radically apart from a roof inspection, and it is settled before the flight, never on the day. Flying over an operational helipad requires strict coordination with the operator and the department concerned — technical management and the air-ambulance reception team at a hospital, HSE and the flight department at an industrial site. Four commitments shape the preparation :

an agreed flight window, notified internally, chosen on a statistically quiet slot, with a fallback time in case of cancellation ;
a permanent radio or telephone watch throughout the mission, with a named, reachable contact and a second pilot or assistant dedicated to that watch ;
an immediate-stop instruction when a flight is announced : the drone lands and the airspace is cleared without discussion — hence breaking the inspection into short sequences rather than one continuous flight ;
a written prevention plan and a take-off point clear of the approach paths and walkways, along the lines of our guide to hosting a drone mission on an industrial site.

The airspace framework comes on top of this, not instead of it. A helipad is a known and declared landing site : preparation checks the status of the airspace around the site, particularly where the facility lies under a control zone, following the approach detailed in our guide to drone missions in a CTR and aerodrome protocols. On the contractor's side, up-to-date professional liability insurance is a non-negotiable prerequisite on this kind of structure ; a serious operator will ask for it before even discussing a slot.

The mission takes half a day on site for a single helipad : briefing and reconnaissance, vertical photogrammetric sequences over the deck, close manual-flight shots of the lighting, the net, the windsock and the anchorages, a survey of the approach paths and surrounding obstacles, a thermal pass if the supporting structure or the waterproofing are in scope. Usual deliverables : a georeferenced orthophoto of the deck, a photographic sheet flagged point by point, a 3D model where the approach paths are in scope, and a dated condition report.

2026 prices (excl. VAT) : €700 to €1,500 for a full inspection of a single helipad (deck orthophoto, markings, lighting, net, windsock, flagged photographic report) ; €1,500 to €3,000 for a wider campaign combining a 3D model, a survey of the take-off and approach paths and a thermal pass over the supporting structure and the waterproofing junction ; €400 to €800 for a standalone markings-and-lighting survey ahead of a repainting decision ; €500 to €1,000 per visit for annual monitoring on an identical flight plan ; -20 to -30% per site from the third onward for a portfolio of helipads (hospital group, multi-site operator). A travel charge applies beyond a 30 to 50 km radius. Request a quote stating the helipad type (rooftop or ground-level), whether a perimeter net is fitted, the pace of medical movements and the goal (preparing works, an insurance file or periodic monitoring).

Frequently asked questions

Does the helipad have to be closed while the drone flies?

In practice, yes, for a short window agreed in advance with the operator. A hospital helipad sees unscheduled movements by nature : the flight therefore takes place in a slot accepted by the department concerned, with a permanent radio or telephone watch and a single, non-negotiable instruction — land the drone immediately and clear the airspace as soon as a medical flight is announced. It is this immediate-stop rule, more than the flight itself, that shapes mission preparation : the inspection is broken into sequences of a few minutes rather than one continuous flight, so it can be interrupted without losing the work already done.

Does a drone report replace the helipad's statutory inspection?

No. Maintaining a helipad and keeping it compliant is the operator's responsibility, under the checks required by the framework applicable to the infrastructure ; an aerial photographic report carries no certificate value. What it brings is different and complementary : a dated, georeferenced record, comparable from one year to the next, useful to prepare an inspection visit, to price a repainting or waterproofing package, to support a budget request to management, or to document a defect for an insurer. The technical decision remains with the operator and its engineering consultant.

Does the drone measure surface friction or the photometric compliance of the lighting?

No, and it should not be presented as doing so. The drone provides a remote visual and thermal observation : it sees a crack, a delamination, a faded marking, a light that is missing, fouled or visibly misaligned, an obstructed approach path. It measures neither a surface's friction coefficient nor the luminous intensity or colour of a lighting unit, which require dedicated measuring equipment and a ground check. The right use of the overflight is to target those checks : to flag the points worth inspecting closely rather than walking the whole deck blind.

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