To manage the energy at 4 degree GPA, the slat/flaps/speed brake noise would likely negate any benefits regarding noise abatement...
Cant see many 4 engine or heavies making a steep slope like that, most of the time, we are trying to reduce the GPA to 2.8/2.5 to manage a descent queue...
few guidance systems are set up for that...
Last edited by FlightPathOBN; 4th September 2012 at 16:12.