It amused me that when the Partenavia (A piddling little six-seat light piston twin) was approved for LCY it needed a far higher power setting to achieve the steep approach required as it was necessaryto use full drag flap setting than it needed with an intermediate flap setting when doing a normal 3 degree approach. Admittedly the noise footpring must have been much smaller because of the steepness of the approach but it certainly made much more noise at low level!
P.P.