Hi controllers. I was flying into KSFO from KLAX today (June 30) and the NorCal Approach frequency was not manned at the time so I contacted the tower. As per the Approach Types post in the Tutorials category which I’d read ahead of time I announced inbound on the ILS for runway 28L since I was approaching from the southwest. This was clearly incorrect because while the tower controller did clear me for straight in on that runway (thank you) I was also told to check the ATC tutorials on the forums. This all occurred at 21:00 on the expert server.
So, what did I do wrong here and what is the correct procedure in this case when the approach frequency is unavailable and you’re contacting the tower for an approach? It’s very important to me that I do this correctly as I’m learning and don’t make stupid mistakes. Thanks!