RTCA/DO-160 Section 8 verifies that equipment can operate or will not be damaged when subjected to vibration levels depending on the installation and location in the aircraft. RTCA/DO-160 Section 8 has many categories of vibration (S, H, Z, and R for Fixed Wing; and R, U and U2 for Helicopter). Depending on the type of aircraft, the location of the unit in the aircraft, and proximity to the engines (based on ‘Zones’) the test levels and durations are determined.