What is the 3-Axis Accelerometer Specification / Part Number

check this "For the inertial guidance system, ACAL recommended a Bosch BMA150 3-axis accelerometer which works in conjunction with a 2-axis gyrometer and a 1-axis yaw gyrometer to provide the data for the auto-pilot. Initially. the AR.Drone used a QFN-packaged accelerometer, but ACAL suggested migrating to the LGA-packaged BMA150. This reduced both the power consumption and cost," from here. the datasheet is available here. Just in case you need the navigation board, is is available at places like this. Hope this helps, good luck.