AET Navigation Equipment 3

Question 1

What is the primary function of a Distance Measuring Equipment (DME) system?

Accepted Answer

Measures slant range distance to a ground transponder

Answer

DME measures slant range (line-of-sight distance) between the aircraft and a ground transponder by timing interrogation/reply pulse pairs.

Question 2

In an Inertial Navigation System (INS), what component detects rotational motion?

Accepted Answer

Gyroscope

Answer

Gyroscopes detect rotational motion (attitude changes) while accelerometers measure linear acceleration in an INS.

Question 3

A VOR receiver measures the phase difference between which two signals?

Accepted Answer

30 Hz reference and 30 Hz variable signals

Answer

VOR bearing is determined by comparing the phase of the 30 Hz omnidirectional reference signal against the 30 Hz variable phase signal.

Question 4

What does a RAIM (Receiver Autonomous Integrity Monitoring) function do in a GPS receiver?

Accepted Answer

Detects faulty satellite data using redundant satellites

Answer

RAIM uses extra visible satellites beyond the minimum required to self-check GPS integrity and alert crew if a satellite is providing erroneous data.

Question 5

Which frequency band does a typical radio altimeter operate in?

Accepted Answer

C-band (4.2–4.4 GHz)

Answer

Radio altimeters operate in the C-band at 4.2–4.4 GHz, transmitting FM continuous-wave signals toward the ground to measure altitude above terrain.

(AET) Aircraft Electronics Technician Practice Test