Quote:
Originally Posted by MikeD  I had to squawk 4000 today.  |
I learn something every day, this is what I found after googling your 4000 thing:
9.4.3.11. Whenever an individual aircraft within a formation becomes separated by more than one (1) NM laterally or 100’ vertically from the formation leader, the pilot will immediately squawk code 4000 with mode C altitude encoded.