Question

How to determine the true vertical reference?

(a) Differentiating

(b) Time average of apparent vertical

(c) Integration

(d) Sum of all the apparent vertical

This question was addressed to me in exam.

This key question is from Vertical & Heading References in division Air Data Systems, Altitude and Heading Reference of Avionics

Answer 1

Correct choice is (b) Time average of apparent vertical

To elaborate: The simplest approach to the determination of the true vertical is to time-average the direction of the apparent vertical(vector sum of gravity and vehicle acceleration).