AET Avionics Systems 3

Question 1

What does the term 'EFIS' stand for in modern avionics?

Accepted Answer

Electronic Flight Instrument System

Answer

EFIS stands for Electronic Flight Instrument System, replacing traditional electromechanical gauges with digital displays.

Question 2

Which bus architecture is commonly used in modern commercial aircraft for avionics data communication?

Accepted Answer

ARINC 429

Answer

ARINC 429 is the standard data bus used in commercial aviation for unidirectional communication between avionics systems.

Question 3

What is the primary function of a Traffic Collision Avoidance System (TCAS)?

Accepted Answer

Issue resolution advisories to avoid mid-air collisions

Answer

TCAS interrogates transponders of nearby aircraft and issues resolution advisories (RAs) to pilots to prevent mid-air collisions.

Question 4

In an Inertial Reference System (IRS), what sensors are used to measure angular rate?

Accepted Answer

Ring laser gyroscopes or fiber optic gyroscopes

Answer

Modern IRS units use ring laser gyroscopes (RLGs) or fiber optic gyroscopes (FOGs) to measure angular rate without moving parts.

Question 5

What frequency band does the ILS localizer transmit on?

Accepted Answer

108–112 MHz VHF

Answer

The ILS localizer transmits between 108 and 112 MHz in the VHF band, providing lateral guidance to the runway centerline.

(AET) Aircraft Electronics Technician Practice Test