TB-9-2350-277-40&P-1 M121 M1064A3 Crew Modification Kit Volume 1 Download
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TB 9-2350-277-40&P-1 MODIFICATION PROCEDURES – Continued 0004 00 0004 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 (3) on hull roof 45 degrees diagonally across left rear corner. Measure 1-61/64 inches from the rear edge of hull (1). Measure 12-7/8 inches for furthest point and 1-15/32 inches for closest point from the left hull edge (2). 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 (4) using a 5/16 inch drill bit to a maximum depth of 1-1/4 inches into hull. 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 (5) using a 3-1/2 inch saw drill bit and magnetic drilling machine. 6. Tap four holes (4) using a 3/8 x 16 tap to a minimum of 1 inch depth. Break all sharp edges. Figure 2. Location for CREW II Cable Port (External Fuel Tank Not Shown) 7. Paint drilled areas to prevent corrosion. Reference TM 43-0139.