DADE Aircraft Communication Systems 3

Question 1

During oceanic operations, when does a dispatcher typically use CPDLC (Controller-Pilot Data Link Communications)?

Accepted Answer

To send and receive ATC clearances and position reports digitally, reducing voice congestion

Answer

CPDLC allows ATC and pilots to exchange messages digitally, reducing frequency congestion and improving accuracy in oceanic and remote airspace.

Question 2

What is the standard VHF communications frequency band used for air-to-ground aeronautical communications?

Accepted Answer

118.0–136.975 MHz

Answer

Aeronautical voice communications use VHF frequencies between 118.0 and 136.975 MHz, with 25 kHz or 8.33 kHz channel spacing.

Question 3

Which of the following best describes the HF communication challenges dispatchers should anticipate on North Atlantic tracks?

Accepted Answer

HF communications may be degraded by ionospheric disturbances, especially during solar events

Answer

HF propagation is subject to ionospheric conditions, and solar activity can cause blackouts or significant signal degradation.

Question 4

An aircraft transmits an ACARS OUT message. What event does this typically report?

Accepted Answer

Aircraft doors have closed and the aircraft has pushed back from the gate

Answer

ACARS OUT (O) message is generated when the aircraft leaves the gate/pushes back, with doors closed and brakes released.

Question 5

What is the purpose of the 8.33 kHz channel spacing now required in European airspace?

Accepted Answer

To triple the number of available VHF communication channels in congested airspace

Answer

8.33 kHz channel spacing replaces 25 kHz spacing, tripling available VHF frequencies to reduce congestion in high-density European airspace.

(DADE) Designated Aircraft Dispatch Examiner Practice Test