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

118–137 MHz

Answer

960–1215 MHz

Answer

108–118 MHz

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

Any FAA-certificated mechanic

Answer

Only an FAA-certificated repairman with an avionics rating

Answer

Any person supervised by a licensed engineer

Question 3

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

Accepted Answer

406 MHz and 121.5 MHz

Answer

121.5 MHz only

Answer

243.0 MHz only

Answer

406 MHz only

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

HF voice channels

Answer

ATC radar secondary surveillance

Answer

DME interrogation/reply channels

Question 5

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

Accepted Answer

9.3–9.5 GHz

Answer

1 GHz

Answer

3 GHz

Answer

35 GHz

Question 6

TCAS II issues Resolution Advisories (RAs) by coordinating with the intruder aircraft via:

Accepted Answer

Mode S data link at 1030/1090 MHz

Answer

VHF voice communication

Answer

ACARS messaging

Answer

ATC radar instructions

Question 7

When using a spectrum analyzer to measure a VHF COM transmitter output, a technician observes harmonic spurs 40 dB below the fundamental. This result is:

Accepted Answer

Within typical acceptable limits for airborne transmitters

Answer

A critical failure requiring immediate grounding

Answer

An indication of a failed PA stage

Answer

Normal and means the transmitter is operating at maximum power