According to the United States Air Force the accident was due to a navigation error when the aircraft flew into a snowstorm.
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Hinterhornbach is the valley settlement on the southern side (in the Tyrol, Austria).
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The next day he walked via Weißenbach and the Gaicht Pass to Nesselwängle, climbed the Aggenstein and overnighted in Schattwald.
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The rather more challenging Bäumenheimer Weg runs from the south, starting at Hinterhornbach in the Lechtal and takes 4½ hours to the top.
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On the next day he climbed south on the eastern side of the south-southwestern arête into the Rosskar cirque and continued down to Hinterhornbach.