From my company books:
3.2 Approach procedures
— Initial and Intermediate Approach Altitudes without Radar Vectors
Where no minimum altitudes have been specified, the Minimum Sector Altitude(s) as shown on the
approach charts are applicable.
When approach clearance is obtained from ATC, follow the descent procedures as depicted on the
approach chart. Inform ATC when leaving and reaching the prescribed Flight Levels and/or altitudes.
— Initial and Intermediate Approach Altitudes with Radar Vectors
When approach clearance is obtained from ATC, maintain last assigned Flight Level or altitude unless
otherwise instructed (e.g. by means of a published procedure) or until intercept of ILS localizer and glide
path. If another altitude than the last assigned is desired to intercept final, descent clearance for that altitude
must be requested.
Radar guidance on final approach is only authorised if SRE or PAR minima are published on the approach
chart.
I'm looking for ICAO? documents where this information is coming from, does anybody know a source for this information?
Thanks!
slam_dunk