Refer to figure.

Learning Objective 062.02.05.02.04: State that warning flags will appear for both the LOC and the GP if the received signal strength is below a threshold value.

Learning Objective 062.02.05.02.05: Describe the circumstances in which warning flags will appear for both the LOC and the GP: absence of the carrier frequency; absence of the modulation simultaneously; the percentage modulation of the navigation signal reduced to 0.

Warning flags indicate that the required signals cannot be correctly or sufficiently received. You will get a LOC flag when no signal is received, or when there is no modulation in the signal.

If the incorrect ILS frequency is selected, then it is most likely that no signals on that frequency are being received, so the flag will be seen and may go out if the correct frequency is selected, so 1 is correct.

If the signal is not strong enough, then flags will also show, so when the signal becomes stronger, the flags will go out, so 2 is also correct.

When you get within the coverage area, the modulation will start to be detected by the receiver, whereas it is not assured outside of the coverage area, so the flags will also go out, so 3 is correct.

The flags should not occur when the aircraft gets more than half-scale deflection as that is still well within the coverage area. Half-scale deflection is when the aircraft leaves the protected area and must go around.