[NTG-context] Switching form portrait to landscape and back to portrait

Dear list, I am struggling with a document, where from time to time a landscape page is inserted. \chapter{One} running tex A4 \chapter{Two} landscape table A4 \chapter{Three} running text A4 It sounds maybe stupid, but I tried different variations and I do not get what I need ... How do I setup a correct switching? Thanks for advice! Willi