AET Avionics Systems 5

Question 1

What is the significance of ARINC 664 (AFDX) over ARINC 429 in modern avionics?

Accepted Answer

AFDX supports bidirectional high-speed Ethernet-based communication versus ARINC 429's unidirectional low-speed links

Answer

ARINC 664 (AFDX) uses switched Ethernet technology enabling bidirectional, high-bandwidth data exchange compared to ARINC 429's slower unidirectional links.

Question 2

A pilot reports the radio altimeter reads zero while airborne over water at 500 feet. The most likely cause is:

Accepted Answer

Antenna connector failure or water intrusion in the antenna

Answer

Radio altimeter antenna failures or connector corrosion cause false zero or invalid readings because the RF signal path is broken.

Question 3

Which type of display symbology standard governs the presentation of flight data on Primary Flight Displays (PFD) in transport aircraft?

Accepted Answer

ARINC 661

Answer

ARINC 661 defines the standard interface and symbology specification for cockpit display systems, including PFD graphics rendering.

Question 4

What does 'BITE' stand for in avionics maintenance contexts?

Accepted Answer

Built-In Test Equipment

Answer

BITE stands for Built-In Test Equipment, onboard self-test circuitry that monitors LRU health and stores fault codes for maintenance retrieval.

Question 5

On a glass cockpit aircraft, what does the magenta triangle on the navigation display (ND) typically represent?

Accepted Answer

Active waypoint or TO waypoint

Answer

The magenta triangle on the ND indicates the active TO waypoint that the flight management system is currently navigating toward.

(AET) Aircraft Electronics Technician Practice Test

(AET) Aircraft Electronics Technician Practice Test

AET Avionics Systems 5