On 18 October 1973, four Army Reserve crewmen returning from Columbus to Cleveland reported a disturbing encounter near Mansfield, Ohio. Their later signed report described a converging red light, an evasive descent, an apparent pause above the helicopter and a climb which the commander did not believe he had commanded. The case is substantial as a documented report. Establishing what produced the light, and whether it physically affected the helicopter, requires a separate assessment of the observations and their limitations.
The November report records an October encounter
The Army disposition form dated 23 November 1973 identifies helicopter 68-15444 and names Captain Lawrence Coyne, Lieutenant Arrigo Jezzi, Robert Yanacsek and John Healey. All four attested to the account. It places the encounter at about 23:05 on 18 October, east-southeast of Mansfield airport, during a flight from Columbus to Cleveland. The document date is therefore later than the incident; it should not be presented as a report written in the cockpit.
According to that form, Yanacsek saw a red light to the east while the helicopter was flying at 2,500 feet. The light appeared to converge, and Coyne took the controls and descended towards 1,700 feet to avoid a collision. These are reported altitudes, not heights above the nearby ground. The estimate of more than 600 knots belongs to the crew’s interpretation of the approaching light, rather than to an independently measured track.
A pause, a departure and an unexpected instrument reading
The form describes the object as momentarily hesitating over the helicopter before moving west and then towards the northwest. Coyne reported seeing an indicated climb of 1,000 feet per minute and an altitude of 3,500 feet while the collective control remained fully lowered. The helicopter subsequently returned to 2,500 feet and continued to Cleveland. The form also records a radio call to Mansfield and the absence of a response to a question about nearby high-performance aircraft.
The importance of the signed document is specific. It establishes that the crew formally put these claims on record and accepted the shared account. It does not supply an instrument trace of the climb, a calibrated measurement of the other object’s speed or an engineering finding that an external force lifted the helicopter. The official form and a demonstrated explanation are different kinds of evidence.
The later investigation and its source dates
Jennie Zeidman’s 1979 Center for UFO Studies report preserves interviews and an extended investigation. It reproduces a January 1974 interview between J. Allen Hynek and Coyne, followed by Zeidman’s later discussions. The report’s source list distinguishes interviews, recordings, handwritten notes, consultations and review meetings. These materials provide considerably more detail than the Army form, while introducing the normal need to distinguish early recollection from accounts refined over subsequent years.
Coyne told Hynek that the crew initially considered the light to be traffic. As the apparent approach became threatening, he took control and attempted an evasive descent. In the interview he described a sharply outlined, grey-looking structure with coloured lights. The observer’s certainty about seeing an unfamiliar form is part of the testimony; it does not identify the object’s origin or establish that its estimated dimensions were correct.
The crew did not all describe the same view
The report’s summary of crew observations attributes a cigar-like structure and a green beam to Coyne, Healey and Yanacsek. Jezzi, whose view and responsibilities differed, reported a white light rather than the same detailed structure. It is consequently inaccurate to turn the case into four identical descriptions of a solid vehicle. The crew shared the flight and the concern, but their perspectives were not interchangeable.
In the interview material, the green light is particularly striking. Coyne described it entering through the front and making the cockpit appear green. Discussion with Hynek considered the helicopter’s green-tinted upper panels; the later investigator also examined why the witnesses thought the light came from elsewhere. That discussion is evidence of a question being examined, rather than an experimental demonstration of the light source. A triangular or pyramid-like beam is not evidence that the alleged object itself was triangular.
What the radio evidence can establish
Zeidman’s radio-malfunction discussion returns to Coyne’s description of trying different channels and hearing the radio’s own switching and keying sounds. He said that contact had worked earlier and worked again afterwards. The report also records his statement that Mansfield could not find the exchange on its tapes. No surviving independent recording of the claimed initial exchange is supplied in that discussion.
A failure to receive an answer is a real operational concern, but it does not alone diagnose a transmitter failure, let alone identify what caused it. The report raises ionised air as a possible mechanism which could obstruct communication. It does not present a measurement of ionisation around this helicopter. That distinction prevents a plausible general mechanism from being promoted into a finding about this particular encounter.
The climb and the proposed explanations
The discussion of the unexpected ascent includes a useful attempt to challenge the control-position recollection. During a later review, Zeidman asked whether looking upwards might have changed Coyne’s arm and collective position. Yanacsek recalled him hunched forward, and Coyne agreed. This is a meaningful examination of an alternative within the interview record. It remains a retrospective exchange, rather than an independent recording of the controls at the time.
In her explanatory analysis, Zeidman considered a conventional aircraft and a meteor. She argued that the reported speed changes, apparent hovering, light configuration and lack of noticed noise or turbulence did not fit an ordinary aircraft. She also argued that a meteor did not fit the reported duration, structure and movements. These conclusions depend on the observational estimates and identifications being evaluated. They should be attributed to the investigator, rather than presented as proof that every conventional possibility was eliminated.
The outcome is about the available evidence
Zeidman’s conclusion called the object unidentified and explicitly left unresolved the degree to which it affected the helicopter’s instruments or flight path. She proposed no specific identification of the phenomenon. Her assessment was more limited than claims that the case established a technology, a propulsion method or an extraterrestrial intervention.
This case is classified here as Insufficient evidence for a secure physical explanation. The sources examined document the crew’s observations and a serious later investigation, but do not supply the independent measurements needed to establish the object’s identity, true speed or causal connection with the climb and radio difficulty. This classification does not accuse the crew of invention or make an undocumented explanation into a fact. It states what the reviewed evidence can and cannot settle.
Location, imagery and related records
The map uses an approximate Mansfield city reference from the U.S. Census Bureau’s Ohio gazetteer. The reported encounter occurred in the wider airport area, east-southeast of the airport; the point is neither an exact aerial encounter position nor a landing site. It gives geographical context without inventing a precise track.
The lead image reproduces only the official-duty Army form, a U.S. federal government work. It does not reproduce the copyrighted investigator photographs and drawings elsewhere in the 1979 book. The separate transcription of the form is a useful reading aid, but the facsimile should be checked where OCR gives doubtful numbers or names. For another aircraft case in which a radio problem and a radar return were discussed separately, see Minot, 1968.