a known good unit - as in electronic black boxes - that are usually off limits for general use.
Carefully compare this circuit to the hanger queen over there and dont you mess one hair on its it head doing it Mister!
by Commander Carl December 29, 2005
an aircraft that spends too much time getting repaired in the hanger it never actually is operational/flight ready.
pull the part off the hanger queen......it ain't gonna fly no way....
by Sgt. Spin Dr. February 27, 2009