Aviation Maintenance Terms beginning with R

Range Reference

The CDTI feature of displaying range rings or other range markings at specified radii from the own-ship symbol.

Receiver Autonomous Integrity Monitoring (RAIM)

Any algorithm that verifies the integrity of the position output using GPS measurements, or GPS measurements and barometric aiding, is considered a RAIM algorithm. An algorithm that uses additional information (such as a multi-sensor system with inertial reference system) to verify the integrity of the position output may be acceptable as a RAIM equivalent. Within this AC, the term RAIM is a synonym for aircraft-based augmentation system (ABAS) and is used to refer to both RAIM and RAIM-equivalent algorithms.

Reference Aircraft

An aircraft within the ITP geometric criteria for usage as reference when requesting an ITP clearance.