Use this guide to replace the trackpad.
Before proceeding, close your computer and lay it on a soft surface top-side down.
Remove the following ten screws:
Two 9 mm 5-point Pentalobe screws
Eight 2.6 mm 5-point Pentalobe screws
The special screwdriver needed to remove the eight 5-point Pentalobe screws can be found here.
Wedge your fingers between the display and the lower case and pull upward to pop the lower case off the Air.
Remove the lower case and set it aside.
Grab the clear plastic pull tab attached to the battery connector and pull it toward the front edge of the Air to disconnect the battery from the logic board.
Do not lift upward on the connector as you disconnect it.
Remove the following five screws securing the battery to the upper case:
Three 6.3 mm T5 Torx screws
Two 2.4 mm T5 Torx screws
When handling the battery, avoid squeezing or touching the four exposed lithium polymer cells.
Lift the battery from its edge nearest the logic board and remove it from the upper case.
If you're installing a new battery, you should calibrate it after installation:
Charge it to 100%, and then keep charging it for at least 2 more hours. Then, unplug and use it normally to drain the battery. When you see the low battery warning, save your work, and keep your laptop on until it goes to sleep due to low battery. Wait at least 5 hours, then charge your laptop uninterrupted to 100%.
If you notice any unusual behavior or problems after installing your new battery, you may need to reset your MacBook's SMC.
Use the tip of a spudger or your fingernail to flip up the retaining flap on the trackpad ribbon cable ZIF socket.
Be sure you are prying up on the hinged retaining flap (on the side opposite the cable), not the socket itself.
Pull the trackpad ribbon cable straight out of its socket toward the rear edge of the Air.
While carefully lifting the keyboard ribbon cable with one hand, use the tip of a spudger or your fingernail to flip up the retaining flap on the keyboard ribbon cable ZIF socket.
Be sure you are prying up on the hinged retaining flap, not the socket itself.
Pull the keyboard ribbon cable straight out of its socket toward the front edge of the Air.
Remove the following twelve screws:
Six 1.6 mm Phillips screws securing the trackpad to the upper case.
Six 1.6 mm Phillips screws securing the trackpad brackets to the trackpad.
A Phillips #000 should be sufficient, but a JIS #000 may also work as well.
Remove the right and left trackpad brackets from the upper case.
Remove the 1.4 mm T5 Torx set screw from its tapped hole near the front edge of the upper case.
During reassembly, do not over-tighten the set screw, as the button will cease to click at a certain point. Adjust the set screw until the movable side of the trackpad has minimal play.
Use the flat edge of a spudger to carefully lift the edge of the trackpad closest to the keyboard from its recess in the upper case by lifting it away from the brackets attached to the upper case.
Remove the trackpad from the upper case.
Past 24 Hours: 3
Past 7 Days: 21
Past 30 Days: 72