Notes:
Walter Czadek was a 32 year-old mechanic who managed an electrical repair shop for cars at his hometown of Hassel, West Germany. Czadek, a touring car racing driver , was mostly known by his seventh place overall in the 1972 24 Hours of Nürburgring, when he shared a BMW 3.0 CS with Werner Scheid.

One of the rounds of the 1975 World Manufacturers Championship was the Internationales ADAC 1000 Kilometer Rennen - informally called 1000 km of Nürburgring -, scheduled for Sunday, 01 June. The event attracted a robust field of 81 entrants, amongst sportscars, grand touring cars and touring cars. Amongst these latter were two cars fielded by Rheydter Club - a BMW 2002 Ti for Walter Pruesen and Peter Sieben, and a BMW 2002 for Czadek and Karl Richter. Competing in the subclass for small engines, the team's cars were amongst the slowest of the field, having qualified 56^th and 59^th amongst fifty-nine starters.

On the eve of that event Czadek hit the track for the Saturday morning practice session. During one of the laps, when Czadek was at the Döttinger Höhe straight a bit past the the 19^th kilometer of the circuit, the gearbox of the BMW seized when it was developing maximum speed. The car hit the guard-rail, bounced over the barrier, flipped even times and crashed into the trees. Czadek sustained multiple wounds in the crash, including a broken arm and a broken leg. He was immediately taken by rescuers to Adenau Hospital, where he succumbed to internal injuries at 15h30 in the afternoon of the same day. The Rheydter Club team withdrew from the race.

According to reports by the marshals who attended to him, Czadek's safety belt was not fastened at the moment of the accident.

• Book "The International Motor Racing Guide", by Peter Higham, David Bull Publishing, Phoenix, United States, ISBN 1-893618-20-X.
• Book "Time And Two Seats", by János L. Wimpffen, published by Motorsport Research Group, Redmond, WA, United States, 1999, ISBN 0-9672252-0-5, Book I, Chapter XII: Mornings After, article “Nürburgring 1000 Kms. – Strategic Folly”, pages 1026 to 1028.
• Magazine Autosprint, issue of 10 June 1975.
• The Wilson Howard Davis Archives.
• Website Pro-Steilstrecke, by Burkhard Köhr, page http://www.pro-steilstrecke.de/tragoedien19751984.htm#1981 Mueller.
• Website Atlas F1, bulletin boards, "The Nostalgia Forum", thread "The Old Nurburgring - How Many Corners?", page 4, posting by Rob Semmeling, message http://forums.atlasf1.com/showthread.php?postid=1872039#post1872039.
• Website World Sports Racing Prototypes, by Martin Krejci, page http://wsrp.ic.cz/wsc1975.html#7.
• Website The GEL Motorsport Information Page by Darren Galpin, page http://www.silhouet.com/motorsport/tracks/nurburgr.html.