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ACUFO:

ACUFO is my comprehensive catalog of cases of encounters between aircraft and UFOs, whether they are “explained” or “unexplained”.

The ACUFO catalog 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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Falkenberg, Halland, Sweden, on August 26, 1947:

Case number:

ACUFO-1947-08-26-FALKENBERG-1

Summary:

In 1999, US ufologist Jan Aldrich indicated in that on August 26, 1947, at 00:30 local time, in Sweden, 10 kilometers in the South-west of "Fkenberg" - certainly "Falkenberg", a DC-3 postal plane pilot and co-pilot was an object like a green parallelogram for 8 to 10 seconds.

Aldrich indicated that this came from a report in the Swedish Defense Archives, according to Swedish ufologist Anders Liljegren.

Data:

Temporal data:

Date: August 26, 1947
Time: 00:30
Duration: 8 to 10 seconds.
First known report date: 1999
Reporting delay: Hours, decades.

Geographical data:

Country: Sweden
State/Department: Halland
City or place: 10 km Southwest of Falkenberg.

Witnesses data:

Number of alleged witnesses: 2
Number of known witnesses: 1 or 2
Number of named witnesses: ?

Ufology data:

Reporting channel: Swedish Defense according to Swedish ufologist.
Visibility conditions: Night.
UFO observed: Yes.
UFO arrival observed: ?
UFO departure observed: ?
UFO action: ?
Witnesses action: Observed.
Photographs: No.
Sketch(s) by witness(es): No.
Sketch(es) approved by witness(es): No.
Witness(es) feelings: ?
Witnesses interpretation: ?

Classifications:

Sensors: [X] Visual: 2.
[ ] Airborne radar: N/A.
[ ] Directional ground radar:
[ ] Height finder ground radar:
[ ] Photo:
[ ] Film/video:
[ ] EM Effects:
[ ] Failures:
[ ] Damages:
Hynek: NL
Armed / unarmed: Unarmed.
Reliability 1-3: 2
Strangeness 1-3: 2
ACUFO: Insufficient information.

Sources:

[Ref. jah1:] JAN ALDRICH:

N - 08.26 - 0030 hours local, Sweden, 10 Km SW of Fkenberg.

DC-3, pilot and co-pilot on postal plane, one object like a green parallelogram seen for 8-10 second. (Report in Swedish Defense Archives, Anders Lilgejren in PJ47 Report, pp 144-145)

"N" means this is a new case not in November 1997 ACUFOE Catalogue.

[Ref. dwn1:] DOMINIQUE WEINSTEIN:

French ufologist Dominique Weinstein compiled a catalog of the cases of UFOs observed from aircraft. This case appears in the February 2001 (6th edition) version of his catalogue as:

DATE 47.08.26
TIME 00:30
COUNTRY Sweden
PLACE 10 km southwest of Fkenberg
A
TYPE OF PLANE AND WITNESSES a postal DC-3 pilot + co-pilot
UFO DESCRIPTION one object looking like a green parallelogram
Radar
G
X
E
SOURCES 03

The source "03" is referenced at the end of the catalog as:

Project 1947 Reports, newsclippings and documents (cases from Jan Aldrich and Barry Greenwood)

Aircraft information:

The DC-3 is the civilian airline version of the famous Douglas C-47 "Skytrain" military transport plane. The photo below is a United Airlines DC-3 - some are still flying in airshows in the 2000's.

DC-3 United Airlines.

The DC-3 has a cruising speed of 207 mph (333 km/h), a capacity of 21 to 32 passengers or 6,000 lb (2,700 kg) of cargo, and a range of 1,500 miles (2,400 km); it can operate from short runways.

Discussion:

There is no "Fkenberg" in Sweden as far as I could verify; but there is a Falkenberg, a locality and the seat of Falkenberg Municipality, Halland County.

Map.

Anders Liljegren is a Swedish ufologist born in 1950, principal manager and executive at the Swedish "Archives for UFO Research" (AFU).

For lack of the primary source, I can only remain with the fact that the information available to me is insufficient; which for example does not allow me to rule out an explanation by a meteor.

Evaluation:

Insufficient information.

Sources references:

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

File history:

Authoring:

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

Changes history:

Version: Create/changed by: Date: Description:
0.1 Patrick Gross June 25, 2026 Creation, [jah1], [dwn1].
1.0 Patrick Gross June 25, 2026 First published.

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This page was last updated on June 25, 2026.