Thanx aterpster, this is Jepp explanation about VNAV coding and how it's depicted on the charts. It's available on the new briefing strip concept description.
VERTICAL NAVIGATION (VNAV)
Vertical Navigation (VNAV) descent information will appear in the profile view of selected non-precision approaches beginning with charts dated 3 Dec 1999. The VNAV information appearing in the profile illustrates the geometric descent path with a descent angle from the Final Approach Fix (FAF) to the Threshold Crossing Height (TCH) at the approach end of the runway.
The VNAV descent path, depicted with a screened line, is based on the same descent angle coded into the Jeppesen NavData database. Use of this descent angle by certified VNAV-capable avionics equipment will ensure a stable, constant rate of descent that will clear all intervening altitude restrictions. Some approach procedures may require a delay of the start of descent beyond the FAF, until the VNAV descent path is intercepted. The profile view will depict this level segment of flight as required.
The VNAV descent angle
appears in brackets along the VNAV descent path and is repeated in the conversion table. Additionally, the conversion table provides a recommended rate of descent relative to the VNAV angle and groundspeed.
The inclusion of the VNAV descent angle does not change or modify existing non-precision approach requirements. Usage of the Minimum Descent Altitude (MDA), as well as the Missed Approach Point (MAP), remains unchanged. In accordance with Federal Aviation Regulations (FARs) and ICAO PANS OPS criteria, do not descend below the MDA until attaining the required visual reference. Additionally, do not initiate the prescribed missed approach procedure prior to reaching the published missed approach point.
NOTE: Operators may obtain permission from their controlling authority to use Decision Altitude (DA) operational techniques when making a VNAV descent. This approval is specific to the operator and to the approach.
VNAV descent is optional. Use of any VNAV approach technique is dependent on operator approval, certified VNAV-capable equipment availability, and crew training.
another question is when will the a/c commence the left turn once the approach has been armed over KA (IAF)? So far I personally haven't seen a coding for timed turn neither in Thales nor Honeywell.
