Question

Which one of the following can provide a reliable and accurate approach path guidance in category II visibility conditions?

(a) ILS

(b) MLS

(c) SBAS

(d) VHF

I have been asked this question by my college professor while I was bunking the class.

The question is from ILS/MLS Coupled Landing System and Automatic Landing in division Autopilots and Flight Management Systems of Avionics

Answer 1

The correct choice is (c) SBAS

Easy explanation: SBAS or Satellite Based Augmentation Systems exploiting differential GPS techniques will be able to provide reliable and accurate approach path guidance in category II visibility conditions. This will be increasingly used in the future.