An Failure modes and effects analysis (FMEA) was made at the beginning of this project and is found in the Appendix~\ref{appendix:fmea}.
The FMEA is ranked from 1 - 5, where a low score is to prefer.
As seen in the table problems with the MCU has the highest RPN score, this because it is the brain of the copter, and an faulty MCU renders in a copter crash.
An faulty MCU is also hard to detect, because the probability to recover the drone after a crash is minor.