We're referring to a supervised solo from an airport other than the airport of origin.
Right, I got that. My point is that all solos from any and all airports have to meet the 61.87(b) Knowledge test, or tests, as appropriate.
At the point the pre-solo knowledge test has already been given. But there is the potential that the procedures and airspace for the new airport might not have been covered.
Exactly, which is why another test is required.
It's pretty much the same approach you would take, as far as the pre-solo knowledge test goes, for a student soloing in a different M&M. At the flight school we just give them a ground review. For independent work, I just go over aircraft performance, flight characteristics and systems, and make a ground entry in their log book referencing 61.87(b)(1)(iii).
I know that you, and many others do this, and is not going to be a problem, probably. Even a POI might even approve that as meeting the requirement, and I don't think any one is going to come after your Flight Instructor Certificate for not doing a pre-solo test for each M&M, and authorized airport, or at least covering all in one.
But, I am imagining an attorney of the deceased in a courtroom asking you where is the written test proving the deceased actually wrote down answers to questions specific to the M&M or airport where the accident occurred.
61.87(a) says a student pilot may not operate a solo flight unless he has met all the following requirements...
(b) says he has to
demonstrate (the operative word here is demonstrate) satisfactory aeronautical knowledge...
then (1)(i)(ii)(iii) breaks it down into the specifics,
then (2) says the instructor must administer the test and review all incorrect answers prior to the solo flight.
nowhere in this group of regulations can I find where it only applies to the first solo only.