"The government must immediately inform parliament of the details of this deployment, in particular what missions will be assigned to these planes and the destination of any data they collect," Tobias Lindner, the green party's
head of defence matters, demanded in German daily Bild.
Though the mission involves sending German troops abroad, the government said it has no plans to consult the Bundestag, Germany's lower house of parliament.
The defence ministry noted the deployment was aimed at carrying out airspace surveillance and not armed operations.
Nato plans a temporary transfer of AWAC aircraft from the west German base in Geilenkirchen to the Konya base in central Turkey, Germany's defence ministry wrote in a December 18 letter revealed Sunday.
Germany contributes about 30 percent of the NATO personnel serving on the 17 Boeing E-3A Sentry AWAC planes in Geilenkirchen, according to the letter.
It was not immediately clear how many planes were to be sent to help Ankara "ensure Turkish security" in view of conflicts in neighbouring Syria and Iraq.
Tensions have been high since Ankara shot down a Russian warplane that NATO member Turkey says strayed into its airspace and ignored repeated warnings.
Sahra Wagenknecht, vice president of radical left party Die Linke, called the mission "highly dangerous" and demanded a vote in the Bundestag.
The head of the Bundestag's defence committee, Social Democrat Wolfgang Hellmich, said the timing of the news was "a bit curious" given that lawmakers were away for the holidays and have not yet taken up the matter.
The lower house was consulted in early December on German plans to contribute up to 1,200 of its soldiers to international operations battlingIslamic State jihadists in Syria and Iraq.