Accident description
Last updated: 31 July 2014
Status:
Date:Tuesday 18 June 1957
Time:10:20
Type:Silhouette image of generic DC3 model; specific model in this crash may look slightly different
Douglas C-47B-1-DL (DC-3)
Operator:Swissair
Registration: HB-IRK
C/n / msn: 20737
First flight: 1944
Engines: 2 Pratt & Whitney R-1830-90C
Crew:Fatalities: 9 / Occupants: 9
Passengers:Fatalities: 0 / Occupants: 0
Total:Fatalities: 9 / Occupants: 9
Airplane damage: Damaged beyond repair
Location:off Romanshorn [Bodensee] (   Switzerland) show on map
Phase: Maneuvering (MNV)
Nature:Training
Departure airport:Zürich-Kloten Airport (ZRH/LSZH), Switzerland
Destination airport:Zürich-Kloten Airport (ZRH/LSZH), Switzerland
Narrative:
The DC-3 departed Zurich at 08:57 on a training flight. Purpose of the flight was to train airline pilot candidates (VFR flight exercises in cutting of one engine and feathering and unfeathering the prop in cruise) and to perform some Swissair planning department tests for a revision of the DC-3 performance table.
Eyewitnesses saw the aircraft flying in various directions at 1000-3000m in the Lake Constance/Bodensee area. At 10:20 when flying between Romanshorn and Arbon, the aircraft was seen flying in level flight when it suddenly stalled and went into a spin. The aircraft struck the water in a very steep dive.


PROBABLE CAUSE: "The stalling of the aircraft following a loss of airspeed, whereupon it unintentionally went into a spin. In view of insufficient altitude, it was not possible to level off the aircraft."

Classification:
Loss of control

Sources:
» ICAO Accident Digest, Circular 59-AN/54 (16-17)


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Map
This map shows the airport of departure and the intended destination of the flight. The line between the airports does not display the exact flight path.
Distance from Zürich-Kloten Airport to Zürich-Kloten Airport as the crow flies is NAN km (NAN miles).

This information is not presented as the Flight Safety Foundation or the Aviation Safety Network’s opinion as to the cause of the accident. It is preliminary and is based on the facts as they are known at this time.
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