Hello,
This topic appeared before.
http://www.pprune.org/forums/tech-lo...eavy-wake.html
I loooked at CAP 493 - Manual of Air Traffic Services also
AIC 17/1999 (Wake Turbulence)
and none seem to show this 1 minute limit.
These docs indicate a 2 minute separation should be given when
departing behind a Boeing 757.
Anyone know where (what publication) this 1 minute comes from ?