Unmarked towers can create deadly hazards for pilots operating at low altitude. Meteorological evaluation towers, GPS towers, telecommunications towers, and similar structures may be difficult to see from the air, especially when they are narrow, unlighted, placed in rural terrain, or supported by guy wires that are nearly invisible until an aircraft is dangerously close.
These hazards are especially serious for pilots engaged in agricultural aviation, aerial surveying, pipeline patrol, powerline inspection, helicopter operations, emergency medical flights, law enforcement flights, wildlife operations, and aerial firefighting. In these operations, aircraft may legally and necessarily fly at lower altitudes than typical point-to-point traffic. When an unmarked tower is placed in an area where low-altitude aircraft operate, a pilot may have little or no time to detect and avoid it.
A collision with a tower or guy wire can destroy an aircraft almost instantly. Even a relatively low structure can cause a catastrophic crash if it strikes a wing, rotor blade, landing gear, windshield, or propeller. For injured pilots, passengers, and families, these cases raise important questions about visibility, marking requirements, tower ownership, notice to the aviation community, local regulations, and whether the hazard should have been identified before the accident.
Why Unmarked Towers Are So Dangerous to Low-Flying Aircraft
Many towers that pose a real danger to aircraft are not large, obvious, or easy to see. Meteorological evaluation towers may have narrow diameters and may be supported by guy wires extending from the tower to ground anchors. Those guy wires can create a broad hazard area even when the tower itself appears small.
A pilot scanning for hazards may not see a thin tower against fields, trees, roads, brush, hills, or other ground features. The problem can be worse in changing light, haze, glare, shadows, or low contrast conditions. A tower may blend into the background until the aircraft is too close to maneuver safely.
The risk is not limited to fixed-wing aircraft. Helicopters may be especially vulnerable during low-altitude missions because they often operate near terrain, utility corridors, fields, rural roads, and remote landing zones. A helicopter pilot may avoid the tower itself but strike a guy wire extending outward from the structure.
These cases can involve controlled flight into terrain concerns when a properly functioning aircraft is flown into an obstacle the pilot did not see or could not avoid. A crash may look like simple pilot error at first, but the real question is often why the hazard was not marked, disclosed, charted, or made visible to pilots operating in the area.
The NTSB Safety Alert on Unmarked Towers
The National Transportation Safety Board issued a safety alert titled The Hazards of Unmarked Towers. The alert warns pilots to remain vigilant for unmarked meteorological evaluation towers and other unmarked towers, including structures used for GPS functionality and telecommunications.
The NTSB explains that MET towers are used to measure wind speed and direction during the development of wind energy facilities. These towers may be only 6 to 8 inches in diameter and may be secured by guy wires attached at multiple heights and anchored to the ground. Because of their size, color, and surrounding terrain, they can be difficult for pilots to see from the air.
The safety alert also explains that many unmarked towers are below the 200-foot FAA threshold that triggers obstruction marking requirements, including lighting. That does not mean the towers are safe. A tower below 200 feet can still be a serious hazard for low-altitude aircraft, particularly when it is erected quickly or without effective notice to local pilots.
The NTSB urges pilots to maintain vigilance for MET towers and other unmarked towers during low-altitude flights. It also recommends that pilots ferry above 500 feet when operations permit, comply with minimum safe altitude requirements, share information about unmarked towers with other pilots, and encourage the marking of towers in their areas.
That guidance is important, but it does not eliminate the need to investigate tower owners, developers, contractors, and other parties after a crash. If a tower creates a foreseeable hazard to aviation, the legal questions may include who placed it there, who controlled it, who knew pilots operated nearby, and whether reasonable steps were taken to make the structure visible.
Agricultural Aviation and Other Low-Altitude Operations
Unmarked tower accidents are especially concerning for agricultural aviation. Crop dusters and other agricultural aircraft often fly low as part of their work. These flights may occur over rural land where MET towers, temporary towers, and guy wires may be installed near fields or future wind energy sites.
An agricultural pilot may be focused on terrain, spray patterns, obstacles, wind drift, power lines, field boundaries, and safe pull-up points. A thin tower or guy wire can be extremely difficult to spot in that setting. The risk is even greater if the structure was recently erected or if local pilots were not notified.
Other low-altitude operations face similar hazards. Pipeline patrol aircraft, survey aircraft, ranching and wildlife aircraft, helicopter emergency medical services, law enforcement aviation units, and aerial firefighting aircraft may all operate in areas where unmarked towers can be present. These flights may be time-sensitive, mission-focused, or conducted in terrain where avoiding one hazard can bring the aircraft closer to another.
When a crash occurs during low-altitude operations, an aviation accident attorney should look beyond the pilot’s final flight path. The investigation should identify whether the tower was marked, lighted, charted, registered, recently installed, known to local aviation groups, or visible under the conditions present at the time of the crash.
Tower Marking, Lighting, and Notice Issues
A central legal question after an unmarked tower crash is whether the tower should have been marked or otherwise disclosed. A structure may fall below the height threshold for certain federal obstruction requirements but still create an unreasonable hazard depending on its location, use, visibility, surrounding flight activity, and foreseeable risk to low-flying aircraft.
Tower marking can include high-visibility paint, spherical markers on guy wires, lighting, flags, contrasting colors, and other measures designed to make the structure more visible from the air. Notice can include reporting the tower to aviation authorities, notifying nearby airports or operators, informing agricultural aviation groups, or maintaining accurate location data.
The NTSB safety alert notes that some states have implemented marking and reporting requirements for MET towers and other towers, but not all states have such requirements. That inconsistency can make these cases fact-intensive. A tower may be legal under one set of rules but still unsafe under the circumstances.
Legal responsibility may depend on who owned the tower, who installed it, who maintained it, who benefited from it, who controlled the site, and who had the ability to mark or report it. Wind energy developers, landowners, tower contractors, telecommunications companies, engineering firms, and maintenance contractors may all need to be evaluated.
Guy Wires and Hidden Obstruction Hazards
Guy wires deserve special attention in these cases. A pilot may see the tower too late but never see the wires at all. Guy wires can extend outward from the tower across a much larger area than the tower’s footprint. They may be thin, unlit, and difficult to distinguish from the ground below.
A wire strike can be catastrophic. It may slice through a wing, damage a rotor system, sever control surfaces, break a windshield, or cause the aircraft to lose control immediately. In helicopters, a guy-wire strike can damage main rotor or tail rotor systems with little opportunity for recovery.
Investigators should measure the location and geometry of all guy wires, anchor points, tower height, and surrounding terrain. They should also document whether any markers were installed on the wires and whether those markers were visible from likely flight paths. If markers were absent, degraded, obscured, or improperly placed, that evidence may be critical.
An expert witness may be needed to evaluate visibility, approach angles, tower placement, wire geometry, and whether a reasonably careful pilot could have detected the hazard in time. Expert analysis may also be needed to determine whether industry practices or state rules required more effective marking.
Weather, Lighting, and Visibility Factors
Visibility conditions can determine whether an unmarked tower is detectable before impact. Adverse weather may include haze, rain, low clouds, glare, or reduced visibility that makes thin structures harder to see. Even clear weather may not eliminate the risk if the tower blends into the background.
A low sun angle can create glare and wash out contrast. Shadows can hide wires. Terrain color can make a bare metal or gray tower nearly disappear. Vegetation, fields, hills, and buildings can make depth perception more difficult when the aircraft is low and moving quickly.
Investigators should obtain weather data, sun position, visibility reports, photographs, and witness statements. It may also be useful to recreate the pilot’s likely view from the aircraft’s flight path and altitude. Drone imagery, ground photographs, aerial surveys, and 3D modeling may help show whether the tower or wires were visible.
A crash involving unmarked towers is not always solved by asking whether the pilot should have “seen and avoided” the obstacle. The better question is whether the obstacle was reasonably visible and whether those responsible for the tower took appropriate steps to protect foreseeable aviation users.
Evidence That Should Be Preserved After a Tower Collision
Important evidence should be preserved immediately after an aircraft collision with an unmarked tower. This includes the aircraft wreckage, tower components, guy wires, anchor points, markers, lighting systems, photographs, video, maintenance records, installation records, land agreements, tower permits, communications, and any reports made to aviation authorities.
The crash site should be documented before tower repairs, wire removal, marker installation, vegetation clearing, or other changes occur. If the tower is altered after the crash, it may become much harder to prove what the pilot could or could not see at the time of impact.
Flight data may help establish altitude, heading, speed, and the aircraft’s path before impact. Depending on the aircraft, useful information may come from GPS devices, tablets, onboard equipment, tracking services, or recovered electronics.
A formal accident report may identify the aircraft, tower, impact location, and early findings. But aviation obstruction cases often require much deeper investigation into tower ownership, marking, notice, visibility, and regulatory compliance.
A preservation letter can help protect records and physical evidence. If a tower owner or contractor changes, removes, repairs, or marks the structure after the crash without preserving evidence, spoliation of evidence may become an important legal issue.
Injuries and Wrongful Death Risks in Unmarked Tower Crashes
Aircraft collisions with towers and guy wires frequently cause catastrophic outcomes. Because the aircraft may lose structural integrity or control almost immediately, occupants may have little chance to survive. Survivors may suffer traumatic brain injury, spinal cord injuries, fractures, burns, internal trauma, amputations, or other serious and catastrophic injuries.
If the crash is fatal, surviving family members may have a wrongful death claim. A wrongful death investigation may focus on whether the tower was unmarked, whether it should have been marked, whether local pilots were warned, whether the tower was installed recently, and whether responsible parties ignored a foreseeable aviation hazard.
Damages may include funeral expenses, lost financial support, mental anguish, loss of companionship, and other losses. If the victim survived for some period after the crash, a survival claim may also be relevant depending on the circumstances and applicable law.
Legal Responsibility After an Unmarked Tower Aviation Accident
Legal responsibility after an unmarked tower crash may involve several parties. The owner of the tower, the company that installed it, the landowner, the wind energy developer, a telecommunications company, a maintenance contractor, or another entity may have had responsibility for marking, reporting, inspecting, or warning about the structure.
These cases often require careful review of federal guidance, state marking statutes, local permitting records, FAA advisory circulars, industry practices, land agreements, and communications between the tower owner and other parties. The fact that a tower was below 200 feet does not automatically end the inquiry. A shorter tower can still be dangerous if it is placed where low-altitude aviation activity is foreseeable.
An attorney may also examine whether the tower was erected quickly, whether it was temporary or permanent, whether it was part of a wind energy project, whether it was reported to any aviation database, and whether nearby pilots, agricultural operators, or emergency aviation services had notice.
An aviation accident attorney can help families and injured survivors identify the responsible parties, preserve evidence, obtain records, and work with qualified experts to determine whether the crash could have been prevented.
Speak With an Aviation Accident Attorney
Spagnoletti Law Firm represents pilots, passengers, and families after aviation accidents, helicopter accidents, and other serious aviation hazards. Our aviation accident attorneys work with qualified experts to review tower marking, visibility, flight path, aircraft wreckage, ownership records, installation documents, state and federal guidance, and the evidence needed to determine what happened.
We offer a free consultation, and we handle aviation accident and wrongful death cases on a contingency fee basis, meaning there are no upfront attorney’s fees and we are paid only if we recover compensation for you.
If you or a loved one has been impacted by an unmarked tower aviation accident, guy-wire strike, helicopter crash, or low-altitude plane crash, call Spagnoletti Law Firm at 713-804-9306 or contact us online.