Point guns aft and down. Remove the four bolts from the azimuth gear case and remove the case.
Remove the four safety hangers with a socket wrench. If a wrench is not available, break the hangers with a hammer.
Remove the twelve yoke connection bolts. The turret will now be free, but may hang momentarily on the fire cut off cam. A swift kick on the aft end of ball will dislodge it from the cam. It is recommended that, although not absolutely necessary, to disconnect the electrical plug and oxygen line prior to removing the twelve yoke nuts.
It is recommended that the sight be salvaged if time permits.
Proceed as follows :
Enter turret and disconnect the flexible shaft from the sight.
Remove the mounting pin from the sight and disconnect the electrical plug. The sight is now free.
Remove sight and drop turret. The entire proceedure takes about 40 minutes.
The above is from the B-17 gunners' file furnished by James S. Peters Sr. T/Sgt B-17 Flt Engr, 27 missions 99 BG, 348BS, 5th Wing, 15th AAF Tortorella, (Foggia#2), Italy,12/03/44-06/19/45 M/Sgt USAF (Retired)