Checkers,
Those who believe they rule the world have TERPS and love to ignore ICAO, hence the differences:
"
46. Circling Approach Obstacle Clearance Protected Area:
a.
FAA - The protected area is much smaller in the USA (1.7 mile radius for
approach category C and 2.3 mile radius for category D), this is well below ICAO
requirements, and makes the circling approach even more difficult and
dangerous.
b.
ICAO - Requires a much larger area. Circling area radius from threshold in ICAO
(DOC 8168 OPS/ 611PANS-OPS-4, page 3-26): A: 1.68nm; B: 2.66nm; C: 4.20nm; D:
5.28nm; E: 6.94nm. The maximum speeds are A: 100KIAS; B: 135KIAS; C:
180KIAS; D:205KIAS; E: 240KIAS. The radius is the distance from the threshold
used to determine the circling area."
The source is from these wonderful pages but I apologise to the author because I have misplaced the proper acknowledgement.
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