No idea why they don't use "FAF21"
From a """recent""" article June 5, 1994. <grin>
It refers to the VOR approach plate.
"Crossing the VOR inbound, the GPS sequenced to the next waypoint, which it showed as ff21, for final approach fix for the Runway 21 approach. The ff21 fix is co-located with the TOP 7 DME point on the VOR/DME approach"
A new aviation era began February 17, the day the Federal Aviation Administration declared the Global Positioning System operational and granted technical standard order approval to the Garmin 155 GPS receiver. The decree came with little fanfare, yet it will affect how we fly for decades to come.
www.aopa.org