TB-9-2350-277-40&P-2 M121 M1064A3 Crew Modification Kit Volume 2 Download
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TB 9-2350-277-40&P-2 MODIFICATION PROCEDURES – Continued 0005 00 0005 00-3 NOTE The 3-9/16 inch hole in the magnetic drill base plate/template must align with 3-1/2 inch hole previously marked on hull roof. Minor adjustments to position magnetic drill base plate/template may be necessary. 2. Position magnetic drill base plate/template (4) on hull roof right rear corner. Measure 12-21/32 inches from the rear edge of hull (1). Measure 2-1/2 inches from the right hull edge (5). NOTE The magnetic drill base plate/template is 1 inch thick. Marking the drill for a maximum depth of 2-1/4 inches will prevent any break thru. 3. Drill four holes (3) using a 5/16 inch drill to a maximum depth of 1-1/4 inches. DO NOT BREAK THRU. 4. Drill a pilot hole (6) using a 1/4 inch drill bit and magnetic drilling machine. 5. Drill center hole (2) using a 3-1/2 inch saw drill bit and magnetic drilling machine. 6. Tap four holes (3) using a 3/8 x 16 tap. Tap to a minimum of 1 inch depth. Figure 2. Location for CREW II GPS Antenna Riser 7. Paint drilled area to prevent corrosion. Reference TM 43-0139.