AET Technical Knowledge and Skills 3

Question 1

HF radio communication in aviation typically operates in which frequency range?

Accepted Answer

2–30 MHz

Answer

HF (High Frequency) communication systems operate between 2 and 30 MHz, providing long-range voice and data communication via ionospheric skip propagation.

Question 2

Under FAA regulations, who is authorized to approve avionics maintenance work for return to service on a certificated aircraft?

Accepted Answer

An FAA-certificated repairman with appropriate ratings or an A&P mechanic with IA

Answer

Return-to-service approval for avionics maintenance requires a certificated repairman with appropriate ratings or an Airframe & Powerplant mechanic holding an Inspection Authorization (IA).

Question 3

An ELT (Emergency Locator Transmitter) certified to TSO-C126 transmits on which frequency?

Accepted Answer

406 MHz and 121.5 MHz

Answer

TSO-C126 406 MHz ELTs transmit a digital distress signal on 406 MHz for satellite detection and a homing signal on 121.5 MHz for local search-and-rescue crews.

Question 4

ACARS (Aircraft Communications Addressing and Reporting System) primarily uses which communication medium for airborne data link?

Accepted Answer

VHF Data Link (VDL) or SATCOM

Answer

ACARS uses VHF Data Link (typically 129.125 MHz and others) for short-range digital messaging and SATCOM for oceanic areas beyond VHF coverage.

Question 5

An airborne weather radar system operating in X-band operates at approximately:

Accepted Answer

9.3–9.5 GHz

Answer

Airborne weather radar X-band systems operate at approximately 9.3–9.5 GHz, which provides good precipitation detection while keeping antenna size manageable.

(AET) Aircraft Electronics Technician Practice Test

(AET) Aircraft Electronics Technician Practice Test

AET Technical Knowledge and Skills 3