From there, the unit will process the information and send an output to the cockpit instrumentation and flight data systems at least 8 times per second.
The Flight Data Recorder doesnt have any errors in terms of air data (altitude, airspeed). Those errors are removed during calibration testing for certification.
"Airdata quantities are needed for a multitude of tasks, including flight safety, control, navigation, weapons delivery, flight test, and flight research. These quantities generally need to be measured and then calibrated to remove errors. The techniques and procedures are here; numerous references should be studied if airdata values are to be measured and calibrated."