6material al aly 6061-t6 per qq-a-250/11 (sm1870-27) or 5052-h32 per qq-a-250/8 (sm1870-21) 0.067/0.059 thk; finish chemical film per mil-c-5541, class 1a; following ref designations marked on each side as listed per sb1198-73-00- top markings e1 fl22 fl23 fl24 e3 fl25 fl26 fl27 fl28 fl29 fl30 fl31 fl32 fl33 fl34 fl35 e5 e7 e9 e11- bottom markings fl23 fl22 e2 e4 e10 e8 e6; dim. In inches- 3.040 long, 3.225 wide; 13 mounting holes 0.123 to 0.129 diam; part no. Marked on bottom per mil-std-130
