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ACUFO is my comprehensive catalogue of cases of encounters between aircraft and UFOs, whether they are "explained" or "unexplained".

The ACUFO catalogue is made of case files with a case number, summary, quantitative information (date, location, number of witnesses...), classifications, all sources mentioning the case with their references, a discussion of the case in order to evaluate its causes, and a history of the changes made to the file.

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Maybe in England, U-K., in 1931:

Case number:



Jimmy Guieu, Science Fiction author, had also become a pioneer of ufology in France in the early 1950s. In his 1954 book "Flying Saucers Come from Another World", he reported that in 1931, "an English pilot reported seeing a strange 'object' in the sky."

Guieu commented that at that time, this isolated phenomenon did not attract public attention.

Guieu gave no source, no location, no precise date, no time, nor any other information, and did not specify whether the "English" pilot had seen the object from a plane or from the ground.

Undoubtedly because of this, the case did not "retain attention" subsequently either.


Temporal data:

Date: 1931
Time: ?
Duration: ?
First known report date: 1954
Reporting delay: 23 years.

Geographical data:

Country: Maybe in England.

Witnesses data:

Number of alleged witnesses: 1
Number of known witnesses: ?
Number of named witnesses: 0

Ufology data:

Reporting channel: UFO book Jimmy Guieu.
Visibility conditions: ?
UFO observed: Yes.
UFO arrival observed: ?
UFO departure observed: ?
UFO action: ?
Witnesses action: ?
Photographs: No.
Sketch(s) by witness(es): No.
Sketch(es) approved by witness(es): No.
Witness(es) feelings: ?
Witnesses interpretation: ?


Sensors: [X] Visual: 1
[ ] Airborne radar:
[ ] Directional ground radar:
[ ] Height finder ground radar:
[ ] Photo:
[ ] Film/video:
[ ] EM Effects:
[ ] Failures:
[ ] Damages:
Hynek: ?
Armed / unarmed: ?
Reliability 1-3: 1
Strangeness 1-3: 1
ACUFO: Totally insufficient information.


[Ref. jgu1:] JIMMY GUIEU:


In 1931, an English pilot reported seeing a strange "object" in the sky. At that time, this isolated phenomenon did not attract the public's attention.




In 1931, an English pilot reported seeing a strange "object" in the sky. At that time, this isolated phenomenon did not attract the public's attention... (Jimmy GUIEU: "Les S.V. viennent d’un autre Monde" Fleuve Noir 1954 – Reissue Omnium Littéraire 1972 p. 222)

Aircraft information:

No information; it is not even established that the observation was made from a plane in flight.


Totally insufficient information.


Totally insufficient information.

Sources references:

* = Source is available to me.
? = Source I am told about but could not get so far. Help needed.

File history:


Main author: Patrick Gross
Contributors: None
Reviewers: None
Editor: Patrick Gross

Changes history:

Version: Create/changed by: Date: Description:
0.1 Patrick Gross November 7, 2023 Creation, [jgu1], [gvo1].
1.0 Patrick Gross November 7, 2023 First published.

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This page was last updated on November 7, 2023.