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I'm looking at St-Frédéric airport in Quebec, Canada (CSZ4) and specifically at the "COMM" section. It says that there is an Aerodrome Traffic Frequency (ATF) on 122.8 but it also seems to say that you need to contact Montreal Centre (135.025) on arrival and departure:

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Does this mean that Montreal Centre is to be contacted only when the ATF (UNICOM) is not operating, or do I have to contact it at all times?

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    $\begingroup$ Since rules vary by country and the question referenced Montreal, I added the Canada tag. $\endgroup$ – Gerry May 6 '18 at 11:40
  • $\begingroup$ Can you link to or quote the text you're looking at? $\endgroup$ – Pondlife May 7 '18 at 0:20
  • $\begingroup$ I've added a screenshot from the Canada Flight Supplement. $\endgroup$ – faridghar May 7 '18 at 5:19
  • $\begingroup$ I'm not familiar with the CFS, but what are you seeing that makes you think it might be mandatory to contact APP/DEP? In the US, the frequencies are shown just in case you need them. $\endgroup$ – Pondlife May 7 '18 at 18:22
  • $\begingroup$ I'd have to check other ATF aerodromes to see if they also list centre frequencies but I can't say I've seen this before. Maybe it has something to do with the proximity of this aerodrome to Quebec's class C airspace. $\endgroup$ – faridghar May 7 '18 at 18:43
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Its a mandatory frequency airport which means that aircraft are supposed to notify center when they arrive or depart.

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  • $\begingroup$ Do you have a reference for that requirement? I couldn't find it in the CARs or the AIM. $\endgroup$ – Pondlife May 7 '18 at 2:42
  • $\begingroup$ I couldn't find that requirement either. In fact transport canada (section 4.5.7) just says you have to contact the MF/ATF on arrival and departure. It also says that if the ground station (UNICOM in this case) is not in operation, then all reports should be broadcast. There is not moention of contacting centre. $\endgroup$ – faridghar May 7 '18 at 5:18

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