You asked:

is tof not a membranophone

Yes. Bogashevo Airport (TOF) is not a drum.
Bogashevo Airport

Tomsk Bogashevo Airport, the airport that serves Tomsk, Russia

drum, a percussion instrument consisting of a membrane (a drumhead or drum skin) stretched over a shell and struck to produce sound

tk10publ tk10canl

Say hello to Evi

Evi is our best selling mobile app that can answer questions about local knowledge, weather, books, music, films, people and places, recipe ideas, shopping and much more. Over the next few months we will be adding all of Evi's power to this site.

Until then, to experience all of the power of Evi you can download her app for free on iOS, Android and Kindle Fire here.

Other ways this question is asked: