REPAIR AUXILIARY POWER UNIT COVER (M577A3 AND M1068A3 ONLY) Continued
Use lock stitching when you install patches, flaps. and straps or repair open seams. Use
polyester thread and smallest needle you can to make weatherproof seams. Allow 5 to 7 stitches
per inch (3 cm). Backstitch all thread breaks at least 1 inch (3 cm). Backstitch all ends at least 1
inch (3 cm), except where ends are turned under in a hem or seam or held down by other
stitching. Maintain thread tension so stitching is tight and lock is fixed firmly in center of
material. Trim all ends. Take care when restitching to make a new stitch line.
11. Repair extensive damage between seams Steps 12 - 22.
12. Open seam 2 inches (5 cm) beyond damaged area on both sides.
13. Square off damaged area from seam to seam.
14. Cut patch 2 inches (5 cm) wider than squared-off section. Allow for 3/4 inch (19 mm) turnunder on sides.
15. Center patch over cutaway section. Turn sides under, and reform double-felled seams at top and bottom.
16. Finish by stitching patch into place. Secure patch to cover with a second row of stitching. Place second row 3/8-1/2 inch
(10-13 mm) from first.
The watershed patch is a patch with the top edge angled off to give a roof effect. Because the
roof type patch sheds water, the patch lasts longer than a square patch.
17. Use watershed patches, as needed.