Adang should probably be classified as 6b "threatened" since it is losing child speakers, is becoming more restricted in domains, and is decreasing in population due to urbanization (Haan 2001: 6). Moreover, even supposedly bilingual young adults show stronger proficiency in Indonesian than in Adang (Hamilton et al 2013).
Haan, John W. 2001. The grammar of Adang, a Papuan language spoken on the island of Alor, East Nusa Tenggara, Indonesia. PhD thesis, University of Sydney.
Hamilton, Amanda, Jawee Perla, and Laura C. Robinson. 2013. A psycholinguistic assessment of language loss in Eastern Indonesia: Evidence from the HALA project. In Mari C. Jones & Sarah Ogilvie (eds.) Keeping languages alive: Documentation, revitalization, and pedagogy, 16-28. Cambridge: Cambridge University Press.
Laura Robinson, PhD
Visiting Assistant Professor
Department of Linguistics
University of California, Santa Barbara
This is good information on Adang [adn] in Papua, Indonesia. We will make these changes for this language in the 18th edition update, due to be released early 2015.