There seems to be a popular trend with some companies to entertain this tacky procedure, not procedure in the Procedure sense (although possible I guess) but procedure as in process.
above your platform altitude to intercept the GS, but were away from the runway, youre aircraft will catch the signal and you will descend with the glide, is this true?
Unfortunately, not always. Also and more importantly, there is a false glide slope which is above the real glideslope - this is higher than the true glideslope and if you catch this then you would end up with a very, very steep rate of descent and or completely miss the target and have to go around, at least - not to mention the airspeed - high rate of descent - unreliable signal not good at all.
Are we talking A320? Realising that to intercept from above is unhealthy due to the false glideslope factor and adjusting alts gets a bit loony when she ignores glide because of Alt.
You could SUBJECT TO MSA OCL OCH and TRAFFIC + ATC requirements, including TERRAIN per se` descend slightly below the glide and then intercept from
below. and as mentioned above, make sure you have LOC and also APP PB pushed too. Admittedly each Approch per the airport especially if mountains surround but even these invariably have a steeper glideslope -
you`ll get this in your training,. it must work as they train it but some pilots don`t like it for the above reasons, be very cagey..