AET Technical Knowledge and Skills 2

Question 1

What is the standard word length for data transmitted on an ARINC 429 data bus?

Accepted Answer

32 bits

Answer

ARINC 429 uses a 32-bit word format that includes label, source/destination identifier, data, sign/status matrix, and parity bit fields.

Question 2

A VOR receiver indicates a 'TO' flag with full left CDI deflection. The aircraft is flying directly TOWARD the station. What is the most likely cause?

Accepted Answer

The OBS is set 90° off from the inbound course

Answer

A full CDI deflection with a TO flag while flying toward the station indicates the OBS course selector is set approximately 90° off from the actual bearing to the station.

Question 3

Standard aircraft AC bus voltage and frequency for most commercial transport aircraft is:

Accepted Answer

115V AC at 400 Hz

Answer

Most transport-category aircraft use 115V AC at 400 Hz, which allows smaller and lighter transformer and motor designs compared to 60 Hz ground power.

Question 4

Which component of an ILS system provides lateral course guidance to the runway centerline?

Accepted Answer

Localizer transmitter

Answer

The localizer transmitter, located beyond the departure end of the runway, radiates two overlapping lobes on 90 Hz and 150 Hz to provide lateral guidance to the runway centerline.

Question 5

A Mode C transponder reply includes which of the following information?

Accepted Answer

Pressure altitude and squawk code

Answer

Mode C transponder replies encode the aircraft's pressure altitude (in 100-ft increments) along with the 4-digit squawk code assigned by ATC.

(AET) Aircraft Electronics Technician Practice Test

(AET) Aircraft Electronics Technician Practice Test

AET Technical Knowledge and Skills 2