ContestID67 wrote:
I just don't get the 2 month after-the-flight calibration. I know that
their must be some logic to this but it escapes me.

Say I fly a great flight for diamond distance. My FR is out of wack by
1,000 feet (unlikely but possible). I send it in for calibration and
now it is perfect.

No, the units aren't modified during calibration.



How does that help the previous great flight?
Isn't the previous log file still 1,000 feet off?

I have to assume that I get a chart that says "Your FR was out of wack
by 1,000". I then supply that with the badge or record documentation?

You've answered your own question. You supply a copy of the chart
with the claim, and critical altitude readings are adjusted manually
to make them more accurate. It's highly unlikely that the pressure
baro readings would actually be off that much, and the GPS altitude
readings don't drift with age, so it's not a big problem.