HF

Question 1

What is considered the safe distance for making High Frequency (HF) transmissions when in the vicinity of refuel/defuel operations?

Answer 1

33 m (105.6 ft)

Question 2

What is the purpose of the Weight On Wheels (WOW) interlock for the High Frequency (HF) radio system?

Answer 2

Prevents accidental Radio Frequency (RF) transmissions while the aircraft is on the ground

Question 3

What safety warning is to be considered regarding the Weight On Wheels (WOW) interlock in order to prevent accidental Radio Frequency (RF) transmissions whilst the aircraft is on the ground?

Answer 3

You must know you can set the WOW interlock to “OFF” with the WOW override switch

Question 4

From which power supply is the High Frequency (HF) radio system powered?

Answer 4

28 Vdc general busbar

Question 5

Which frequency does the antenna switching support shorten the length of the antenna?

Answer 5

Above 9 MHz

Question 6

Where is the High Frequency (HF) Antenna Tuning Unit (ATU) located?

Answer 6

Externally on the tail cone

Question 7

When attempting to select a High Frequency (HF) mode it is found that all the line keys are inoperative and have no captions. Why is this?

Answer 7

The HF radio is in the preset mode

Question 8

How many preset channels are made available to the High Frequency (HF) radio by the Avionics Management System (AMS)?

Answer 8

99

Question 9

To set the High Frequency (HF) radio to encrypted transmissions, how long does the operator have between selecting the SEC soft key and the HF soft key?

Answer 9

Within 5 seconds