The DC-3 carried three Swedish Air Force crew and five FRA personnel.
FILE 055 · SWEDISH SIGINT
INTELLIGENCE OPERATION · RESEARCH DOSSIER
DC-3 / Catalina
A secret SIGINT mission, a Soviet shootdown and a cover story that later became public history.
PRIMARY / CASE IMAGE · Pressens Bild / Wikimedia Commons · Public domain - Sweden · source
01 / DOCUMENTED CORE
Start with what the record can carry.
A Swedish DC-3 used for signals intelligence was shot down by a Soviet MiG-15 over international waters on 13 June 1952; a Catalina search aircraft was later also shot down, with its crew surviving.
FRA now openly documents the DC-3’s SIGINT role and the secrecy surrounding it. The case is a strong example of a once-secret state activity later becoming established public record.
02 / CASE RECORD
What is established.
The aircraft was used for signals intelligence.
A Soviet MiG-15 shot it down over international waters on 13 June 1952.
A Catalina searching for the DC-3 was also shot down; its crew survived.
The Soviet Union acknowledged the DC-3 shootdown in 1991.
03 / VISUAL RECORD
Images with a declared evidentiary role.
The Catalina after it was shot down and ditched, June 1952.
04 / CLAIM LEDGER
One claim at a time.
CLAIM 01The DC-3 was conducting signals intelligence.
DOCUMENTEDThe status applies only to this claim. It does not automatically transfer to other allegations in the file.
CLAIM 02Sweden publicly concealed the SIGINT mission at the time.
DOCUMENTEDThe status applies only to this claim. It does not automatically transfer to other allegations in the file.
CLAIM 03The public record supports stories of surviving crew secretly captured by the USSR.
NOT SUPPORTED BY FRA RECORDThe status applies only to this claim. It does not automatically transfer to other allegations in the file.
05 / TIMELINE
The sequence matters.
- 13 JUN 1952The Swedish DC-3 is shot down.
- JUN 1952A Catalina search aircraft is also shot down.
- 1991The Soviet Union acknowledges the DC-3 shootdown.
- 2003–2004The wreck is found and recovered.
06 / OPEN QUESTIONS
Where the evidence stops.
Which operational details of the intelligence mission remain classified.
How secrecy affected the families and later conspiracy theories.
07 / THREADS
Connections, typed — not implied.
FILE 054Same Institution History
Stella Polaris
FRA history links Finnish-Swedish wartime SIGINT cooperation with the later institutional history of Swedish signals intelligence.
DOCUMENTED CONTEXT
FILE 058Strategic Parallel
U-2 / Bodø
Both concern Cold War airborne intelligence/reconnaissance and Nordic geography; no single operational chain is asserted.
CONTEXT ONLY
08 / SOURCE STACK
Primary and official records first.
EDITORIAL STATE
RESEARCH DOSSIER
This page is live because the route and core evidence are useful. The label does not mean every allegation has been exhaustively reviewed.
REVIEW STATE
SOURCE CHECKED
DOCUMENTED is the current file-level lens. Claim-level labels above remain controlling for individual allegations.