A-10A s/n AF 78-0583 
USAF 104 FW, NAS Norfolk, Oct 1999

Forward fuselage viewed from port.
The smaller of the the rearward facing air scoops covers an internal gun gas purge fan.
The one fitted to the ammo loading door was introduced on s/n 81-0981. Both scoops have been retrofitted to earlier aircraft.

Photo by Gunnar von Schaewen