8) Loss of AHRS in FLT

This accident is where loss of vacuum (older planes) or loss of attitude display (newer planes) causes the pilot to have very little pitch and bank information, or in some cases none at all. The old school name for this was called partial panel flying and IFR rated pilots received training and check ride evaluation on their ability to fly while under IMC (real or simulated) conditions with loss of Attitude, Heading reference System (AHRS) In later model more advanced aircraft there is an actual unit called the AHRS hardware that generates gyroscopic information that is then sent to the display. In electronic aircraft, either the AHRS unit or the display itself could fail while in IMC conditions, and require the pilot to be able to fly and navigate on remaining data.