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Advisory Circular from FAA ADS-B in Formation 4.3.1.3 Formation Operations

Just released Advisory Circular from the FAA re ADS-B in Formation:
4.3.1.3 Formation Operations. ATC uses established transponder and ADS-B transmission procedures when participating in formation operations. Per the Aeronautical Information Manual (AIM) paragraph 4-1-20, if the formation flight is receiving ATC services, pilots can expect ATC to direct all non-lead aircraft to “STOP SQUAWK,” and should not do so until instructed. For visual flight rules (VFR) formation flights not receiving ATC services, ATC directs that only the lead aircraft should squawk the assigned beacon code (1200). All other aircraft should disable transponder and ADS-B transmissions once established within the formation. (Bold added).

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