Remove the following 10 screws securing the lower case to the Air: Six 2.8 mm Phillips screws. Two 3.8 mm Phillips screws. Two 5.4 mm Phillips screws. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4617 Slightly lift the lower case near the vents and push it toward the rear of the computer to free the mounting tabs. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4618 Slightly lift the lower case near the vents and push it toward the rear of the computer to free the mounting tabs. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4618 Disconnect the battery connector by pulling it straight out of its socket. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4619 Remove the following nine screws securing the battery to the Air: Four 2.9 mm Phillips. Four 3.8 mm Phillips. One 7.2 mm Phillips. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4621 Lift the battery out of the Air. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4622 Remove the following two screws securing the speaker assembly to the upper case. One 3 mm Phillips. One 5.8 mm Phillips. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4627 Use a spudger to lift the audio-out connector board off the adhesive that secures it to the hard drive bracket. Disconnect the audio out connector from its socket. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4628 Use a spudger to lift the audio-out connector board off the adhesive that secures it to the hard drive bracket. Disconnect the audio out connector from its socket. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4628 Rotate the speaker assembly toward the center of the Air. Use a spudger to pry the speaker cable connector up off the audio board. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4629 Rotate the speaker assembly toward the center of the Air. Use a spudger to pry the speaker cable connector up off the audio board. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4629 Disconnect the port hatch ribbon cable from the logic board by pulling it straight up by its black pull tab. If necessary, pull the audio out ribbon cable off the adhesive securing it to the upper case. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4648 Disconnect the port hatch ribbon cable from the logic board by pulling it straight up by its black pull tab. If necessary, pull the audio out ribbon cable off the adhesive securing it to the upper case. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4648 Remove the four 3.2 mm Phillips screws securing the port hatch assembly to the upper case. Lift the port hatch assembly out of the upper case. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4649 Remove the four 3.2 mm Phillips screws securing the port hatch assembly to the upper case. Lift the port hatch assembly out of the upper case. /Guide/Installing-MacBook-Air-Models-A1237-and-A1304-Port-Hatch-Assembly/851/all#s4649