Bulkhead plate layouts for electronics rooms feature a four-hole junction plate, six-hole ATBM roof bulkhead plate, and ten-hole ATCT roof bulkhead plate. Each assembly utilizes a four-inch by four-inch by one-quarter-inch tinned copper angle with a two-hole lug mounted on the same side as the polyphasors. The layout incorporates specific hole diameters of zero-point-seventy-five inches and zero-point-twenty inches with designated edge distances and spacings. All typical polyphasor hole layouts must be confirmed with the Federal Aviation Administration prior to drilling or purchasing.
2" 2" 4" 4" 1 1/8" 1 1/8" 0.75" DIAMETER HOLE 0.20" DIAMETER HOLE 1 3/16" 4" X 4" X 1/4" TINNED COPPER ANGLE 2-HOLE LUG, MOUNTED ON SAME SIDE AS POLYPHASORS TYPICAL POLYPHASOR HOLE LAYOUT. CONFIRM WITH FAA PRIOR TO DRILLING OR PURCHASING. 1' - 2" ATBM ROOF BULKHEAD PLATE LAYOUT - 6-HOLE 2" 2" 2" 4" 4" 1 1/8" 1 1/8" 0.75" DIAMETER HOLE 0.20" DIAMETER HOLE 1 3/16" 4" X 4" X 1/4" TINNED COPPER ANGLE 2-HOLE LUG, MOUNTED ON SAME SIDE AS POLYPHASORS TYPICAL POLYPHASOR HOLE LAYOUT. CONFIRM WITH FAA PRIOR TO DRILLING OR PURCHASING. 1' - 10" ATCT ROOF BULKHEAD PLATE LAYOUT - 10-HOLE 2" 2" 2" 4" 4" 1 1/8" 1 1/8" 0.75" DIAMETER HOLE 0.20" DIAMETER HOLE 1 3/16" 4" X 4" X 1/4" TINNED COPPER ANGLE 2-HOLE LUG, MOUNTED ON SAME SIDE AS POLYPHASORS TYPICAL POLYPHASOR HOLE LAYOUT. CONFIRM WITH FAA PRIOR TO DRILLING OR PURCHASING. 10" ATCT JUNCTION ELECTRONICS BULKHEAD PLATE LAYOUT - 4-HOLE 2"
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