Rancho Tandera Airstrip, designated ICAO code SIN6, is a small private aerodrome located near Mucajaí in the state of Roraima, northern Brazil. It serves general aviation and agricultural operations typical of remote interior airstrips in the Amazon region. The airstrip provides basic access to an otherwise difficult-to-reach area, supporting local landowners, agricultural enterprises, and light aircraft operations. It does not handle scheduled commercial passenger services.