It does NOT say "notify" prior to entry. It says "Establish two-way radio communications" prior to entry. That means you need to hear your tail number prior to entry.
It IS Established!!! Just about every time, I get those magic words, "Five-One-Two-Whiskey-Whiskey, Clear to transition Class D as requested." Either way, I get an authorization to enter prior to entry with them using my tail number. Then, communication is maintained while within until authorized to switch. How do you think I get the authorization to switch?
So far, I've accumulated some fifty hours bouncing around doing traffic. I've learned well what the towers need and expect of me to play within their airspace.
Now, do you think it would be prudent to switch away from Dobbins (MGE) given the type of traffic they handle? Had you read a previous post, you'd see there are sometimes some VERY fast and NOT very visible traffic into and out of Dobbins AFB. I've already seen an F-22 Raptor ever so slightly be visible on the ground with bright concrete under it. It dang sure wasn't visible in the air during sunset period. I'm not going to try to talk with RYY or FTY during a five minute period I'm passing through MGE's airspace. I'll wait until I'm switched. Sometimes, they'll give me a traffic advisory but usually, it's authorized and I'm on my way to the next tower.
RYY knows I sometimes will head off to the east from their area. Even though I report clear on my own, they specifically ask me to report clear. Considering they could have an ILS approach established from the direction I'd be heading, I
want to advise them.
IIRC, ATC cannot legally authorize a deviation from the FAR's. (Unless they say something like "unless authorized by ATC, ..."). I'm sure Ron can weigh in here and point us to something written on that subject.
ATC has the authority to direct traffic by whatever means necessary to all traffic in their area for the purpose of safe flight. Unless you know something is blatantly unlawful and/or certainly unsafe, follow the order. They may not always have time to give you a reason. You stated that yourself. However, I've not had any order unreasonble or incapable of following or unsafe. If anything, I get traffic advisories for some traffic clearly not a factor but done as a courtesy CYA.
Considering the proximity of these three areas, I'm betting it's by a letter of agreement under FAA Order 7210.3, Letters of Agreement, 4−3−1. Someday, I might get the chance to visit one of the facilities an find out; at least two of the three. Given proximity, PDK is probably included in such a letter.
The best I can tell, I'm being switched from one area to the next while still within the current airspace
so I can establish prior to entry. In fact, it's very rare I'm not. If they don't say so, I may hold on to Dobbins a tad longer if I know there's traffic beneath me and not visible. Then I'll ask them for authorization.
Per FAA Order 7110.65, Coordinate Use of Airspace, 2-14-14 (a):
Ensure that the necessary coordination has been accomplished before you allow an aircraft under your control to enter another controller’s area of jurisdiction.
Then there's FAA Order 7110.65, Control Transfer, 2-1-15:
b. Transfer control of an aircraft only after eliminating any potential conflict with other aircraft for which you have separation responsibility.
c. Assume control of an aircraft only after it is in your area of jurisdiction unless specifically coordinated or as specified by letter of agreement or a facility directive.
I have no clue what takes place between these towers. That's not my concern. But, the above is a pretty good indication they are talking. I establish communication prior to entry, I maintain communication while within that airspace do not switch until authorized to do so. And as said before, that is almost always before I reach the adjoining airspace.
True, but you can listen to the other one so you can flip over and jump in right away.
See above. It ain't happening. The time is too short and it's not worth missing a traffic advisory. Further, do you think Controller A wants you talking to Controller B before there may be a hand-off you're not aware of? Stay with your current controller. Otherwise, you may end up not hearing a much desired traffic advisory or safety alert.
As a last note, I just gave County ATCT a call. They have an LOA for that short stretch where their airspace meets Dobbins. The guy who answered knows my plane well and is apparently quite used to handling Whiskey-Whiskey. He said they will allow me to do whatever is necessary to conduct my flight as long as it's not a safety issue. The only thing they expect is I stay at or below 3,000 so I'm certain to remain within their airspace which tops out at 3,300.
I'm assuming other letters exist between other airspaces. But, that aspect is not my concern. That affects how they handle traffic; meaning how they will direct my aircraft. Given what I learned during that phone call, it's status quo with no issues existing and none expected.
Okay, I'm done with this discussion.