×
Welcome to the IREX question and answer forum. Please feel free to post your questions but more importantly also suggest answers for your forum colleagues. Bob himself or one of the other tutors will get to your question as soon as we can.
3D approach
adrianchiasm
Topic Author
adrianchiasm created the topic: 3D approach
Hi Bob,
Just some questions pondering:
A 3D approach consists of a ILS, RNAV with glide path guidance (LNAV/VNAV), RNAV LPV.
1) Does the LNAV/VNAV and LPV uses WAAS?
2) Is WAAS part of TSO C-145 GPS/GNSS receiver onwards? Or is WAAS also included in C-129?
3) Since both LNAV/VNAV and LPV gives you a glideslope guidance with azimuth, do they belong to the category of a precision approach as well or would it be a non precision approach?
4) Do you use DA or MDA for a LNAV/VNAV and LPV
The AIP defines a precision approach as
"An instrument approach procedure utilising lateral and vertical guidance provided by an ILS or GLS". AIP GEN page 22.
It also defines Decision Altitude (DA/DH) as
"A specified altitude or height in a 3D instrument approach at which a missed approach must be initiated if the required visual reference has not been establshed" AIP GEN 2.2 page 8.
