30W,
Thanks for the reply.
With regards to flying of the G/S. Various 'old wives tales' exist in relation to this. I can only offer you my experience. NO ONE deliberately flies beneath the G/S once established - heavies or otherwise.
Neither does intentioanlly flying high on a G/S take place for several reasons:-
1. Ones doesn't always know the wake votex category of the aircraft ahead. One might guess, but doesn't necessarily know unless visual etc (IMC?).
In the US, FAA AC 90-23F Aircraft wake turbulence, notes the following;
"a. When landing behind a larger aircraft, stay at or above the larger aircraft's final approach flight path.
b. Pilots of all aircraft should visualize the location of the vortex trail behind a larger aircraft and use proper avoidance procedures to achieve safe operations. It is equally important that pilots of larger aircraft plan or adjust their flight paths, whenever possible, to minimize vortex exposure to other aircraft.
12. Pilot responsibility
c. For operations conducted behind heavy aircraft, ATC will specify the word 'heavy' when this information is known. Pilots of heavy aircraft should always use the word heavy in radio communications.
(1) pilots of lighter aircraft should fly on or above the glidepath. Glidepath reference may be furnished by ILS, by a visual slope system, by other ground based approach slope guidance systems, or by other means"
While this is an AC, it does have some foundation. In RNP, as the procedures do not have to be coincident, a 2.8 GPA is frequently used for heavy aircraft.