CFC Communication Equipment Operation 3

Question 1

What HF propagation mode is most commonly used for long-distance oceanic aviation communications?

Accepted Answer

Sky wave (ionospheric) propagation

Answer

HF sky wave propagation reflects off the ionosphere, enabling transmissions over thousands of miles beyond line-of-sight range.

Question 2

A pilot reports a radio as 'unmodulated' during a transmission. What does this indicate?

Accepted Answer

The carrier wave is present but no voice audio is being superimposed

Answer

An unmodulated signal means the transmitter is keyed and a carrier is present, but the microphone or audio chain is not adding voice to the signal.

Question 3

What is the purpose of the 'clarifier' or 'fine-tune' control on an HF single-sideband radio?

Accepted Answer

To fine-tune receiver frequency for natural voice quality on SSB

Answer

SSB reception requires precise frequency alignment; the clarifier allows small frequency offsets to restore natural-sounding voice.

Question 4

Which of the following best describes the function of the ELT (Emergency Locator Transmitter)?

Accepted Answer

Automatically transmits a distress signal on 406 MHz and 121.5 MHz upon crash impact

Answer

The ELT activates automatically on impact and transmits on 406 MHz (satellite-detected) and 121.5 MHz (homing) to assist SAR operations.

Question 5

When a pilot acknowledges an instruction with 'wilco,' what does this term mean?

Accepted Answer

I have received your message and will comply

Answer

Wilco (will comply) indicates the message was received and understood and the pilot intends to follow the instruction.

(CFC) Certified Flight Communicator Practice Test