On the morning of 15 March 1951, workers at Safdarjang Aerodrome in New Delhi reported an elongated object making a pass over the field, returning in a large loop and departing rapidly. The released U.S. Air Force file records an unusually experienced principal observer and approximately twenty-five reported witnesses. It also preserves a qualified evaluation: the movement was compatible with an aircraft, but the witnesses had not identified the familiar aircraft features the evaluator expected. The case was retained as unidentified.
The useful record is more complicated than a single sensational quotation. It contains an attaché’s report, a statement prepared with newspaper assistance, a later message locating the earlier paperwork and a summary card. Two pages repeat substantially the same report. Those repetitions do not increase the number of witnesses or investigations. The documents establish a reported daytime observation and its treatment within an official collection; they do not establish the object’s origin or independently measure its performance.
An encounter at the aerodrome
Captain Robert L. Tillotson, the assistant U.S. air attaché, prepared the report. Its narrative places the chief aerial engineer and his assistants on a taxi strip while work was underway. Around twenty other mechanics and helpers also said they had seen the object. Tillotson reports that the accounts agreed when he interviewed them. The packet does not include twenty-five separate signed statements, so that agreement is the reporting officer’s summary of interviews, rather than a complete set of independent transcripts available for comparison.
The main report describes one object, cigar-shaped, apparently bare-metal in colour, without visible external control surfaces. It gives an estimated length of about one hundred feet and compares the girth to a C-47 fuselage. These were the observers’ descriptions, not dimensions taken from an object on the ground. In particular, the much longer initial cloud described elsewhere in the packet must not be turned into a measured seven-hundred-foot vehicle.
The object reportedly approached from the north at an estimated four to five thousand feet, crossed the field southwards and returned in a large loop. It was lost from view at the top and seen again during the dive. After recovering approximately level flight, it departed towards the southwest at high apparent speed. The report says that an exhaust-like trail remained visible for more than twenty minutes. Neither the object’s range nor its trajectory was established by radar or triangulation.
What the descriptions do, and do not, establish
The chief engineer compared its speed with that of a British Vampire aircraft, estimating roughly three times the cruising speed. The attached statement and summary card also carry a maximum estimate of about 2,000 mph. These are estimates from the account, not independent test results. Without a measured range, apparent angular motion cannot by itself supply an exact speed in miles per hour. A reader should not mistake a number on an official form for a number measured by official instruments.
The same caution applies to the exhaust description. The account distinguishes a pale trail or cloud from darker smoke associated with apparent acceleration. An observer’s impression that this resembled manual or wireless control does not demonstrate a remote-control system, a particular propulsion method or an intelligent pilot. The report records an appearance and an inference drawn from movement; the two are different kinds of information.
The observation was reported in clear, sunny conditions, with approximately thirty miles of visibility and a surface wind from about 300 degrees at fifteen to twenty knots. Those details help define the circumstances supplied by the report. They do not provide a complete atmospheric profile at the object’s supposed altitude. Likewise, the absence of a reported sound does not identify the source. There is no photograph, radar track or physical sample in this packet with which to settle the description.
Experience, interviews and the newspaper statement
Tillotson records that the principal observer had held Indian pilot and engineer licences since 1935 and had about twenty years of practical aviation experience. He lists work across flying clubs, an airline, civil aviation inspection and aircraft engineering. Dr P. Nilakantan, described as a research-and-development official in India’s civil aviation organisation, accompanied the interviewing officer and recommended the engineer highly. Nilakantan’s participation is documented as an interviewer and professional reference; it does not turn him into an eyewitness at the aerodrome.
The file also flags a difference between the attached narrative and the official interview summary. The statement was prepared with help from a newspaper reporter for a newspaper article. It is therefore not an untouched cockpit log or a recording made as the event unfolded. The summary card adds an adverse characterisation of the principal witness, but supplies no independent demonstration of fabrication. Neither professional experience nor an evaluator’s sceptical description should be substituted for checking the actual claims and their limitations.
Names blacked out in the released narrative remain unexpanded here. The public roles of the reporting officer and accompanying official are sufficient to explain the investigation. The value of the file lies in its account, chronology and evaluation, without an attempt to reverse redactions or reconstruct personal details from scattered marginal references.
Several dates in one file
The incident narrative and record card identify 15 March 1951. The cover report is dated 26 March and gives 16 March as its information date. A separate message dated 21 May 1952 concerns locating the earlier Indian report and passing a copy to another officer. It explicitly refers back to the March 1951 observation. This later retrieval of paperwork is not a second sighting in 1952.
The record card pairs a local time of 10:20 with a GMT entry of 04:50, a difference of five and a half hours. The reported duration is approximately seven minutes in the attaché’s account and seven and a half on the card. That small difference should remain visible rather than being turned into an exact independently timed interval. A date on a later evaluation form likewise does not replace the incident date supplied by the report.
Why the card says unidentified
The evaluation card does not say that every known aircraft was scientifically excluded. Its comments regard the flight and manoeuvres as consistent with an aircraft interpretation, but note that the observers should have recognised some feature of an aircraft because of their familiarity with local types. It then lists the case as unidentified. This preserves an unresolved identification problem alongside an ordinary-aircraft possibility, rather than a finding of extraterrestrial technology.
The 1952 message says that its author had found no other report of the Indian sighting in his own files. That statement describes the scope of a particular search, not the absence of every possible Indian civil record. The released packet does not supply a later definitive identification. It would be equally unwarranted to invent a resolution or to elevate the remaining uncertainty into proof of an extraordinary craft.
Location and the source image
The map uses a rounded aerodrome-area reference of 28.58°N, 77.20°E, derived from the original report’s approximate Safdarjang coordinates of 28°35′N, 77°12′E. It does not locate the workers’ exact position on the taxi strip, reconstruct the flight path or imply permission to enter an airfield. New Delhi is the incident location; the American officers and later U.S. filing history do not make this a U.S. state case.
All seven scan pages were examined directly, including the repeated narrative page and the difficult witness statement. The lead image is the Air Force’s official record card, an informative public-domain federal document. It is evidence of the recorded assessment, not a photograph of the object. The original file lets readers compare the report, attachment and later summary instead of relying on modern machine-generated retellings.