Hi All,

I have a question regarding the HIAL requirements on the following Question.
If, like in this case, HIAL is not available at an A/D, and you decide to do a Precision Approach, should the visibility requirement be 1.5km instead of 1.2 km??

You have been cleared to carry out a RWY 01 ILS approach into Townsville in VH-OZY. You have applied pressure error correction to your altimeter.

The landing minima that should be applied for this approach are an altitude of -
Choose one answer.
370 feet and a visibility of 1.2 km Incorrect
270 feet and a visibility of 1.5 km Correct
370 feet and a visibility of 1.8 km Incorrect
750 feet and a visibility of 4.2 km Incorrect

The question says that you have been cleared to do the approach so you must have been given the actual QNH.

The published DA is 370 feet and, since you have applied PEC you don't need to add another 50 feet, however the ILS minima box is shaded, so you can use 270 feet as the DA if you have the actual QNH [AIP ENR 1.5 para 5.3.2].

OZY has no coupled auto pilot capability or flight director so the visibility required would normally be 1.2km.

However the published visibility required is higher than that.
You must use 1.5km visibility.

Townsville is unusual in that the minima box is shaded for the ILS approach. That is unusual since most ILS approaches do not have a shaded minima box. You are correct, you have been cleared for the approach, so you can safely assume that you have been given the actual QNH and you can take 100 feet off so 270 feet would be the correct minimum altitude for this approach. The published visibility with the actual QNH is 1.5 km. That would be because Townsville does not have HIAL. The 1.2 km visibility would not apply since the published visibility is greater than that. The 1.2 km visibility for aircraft without coupled approach capability or a flight director only applies if the published visibility is less than 1.2 [usually it is .8]. The correct answer would be 270 feet and 1.5 km visibility.