Evaluation of Ascent Descent Director (ADD) and Vertical Path Computer (VPC)

摘要

Two RNAV vertical computers were evaluated to determine whether the RNAV computer errors exceeded the 100 foot vertical and 3000 foot horizontal error (2 sigma) allowance suggested by the RTCA SC-116E study group. The evaluation procedure attempted to isolate the vertical from the horizontal errors, but could not do so. Therefore, the horizontal along-track error contributed to the vertical error effect. The vertical 'resultant' error of the Ascent-Descent Director (ADD) and the Vertical Path Computer (VPC) were both within the error envelope allowed the 3D-RNAV computer. (Author)