LNAV-VNAV approach & landing - The future in aviation?

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LNAV-VNAV approach & landing - The future in aviation?

Post  Admin on Sun Mar 16, 2008 7:31 pm

There are LNAV/VNAV procedures, so far considered NPA (non precision approaches) but as the technology advances (GPS as part of it) and as there are many researches made on this issue, soon (2010-2020) it will become an approved PA (precision approaches).
Here is a detailed description of the present and the future in aviation's navigation:

R-NAV = A method of navigation which permits aircraft operation on any desired flight path within the coverage of referenced navigation aids or within prescribed limits of self contained aids.
RNAV operations support navigation in any airspace without the need to fly directly over ground based aids.
Aircraft P-RNAV equipment automatically determines aircraft desired flight path by a series of waypoints held in a database.

Basic RNAV (B-RNAV)= requires aircraft conformance to a track keeping accuracy of ±5NM for at least 95% of flight time to ensure that benefits are achieved whilst meeting the required safety targets.
B-RNAV became mandatory in European Airspace in April 1998 for en-route operations.
B-RNAV Used solely for: En route & connection to Terminal Areas

Precision-RNAV (P-RNAV) (is the natural progression from B-RNAV)= keeping equates to cross track accuracy of RNP 1 (±1NM).
P-RNAV procedures are designed to a common set of design principles specific to RNAV equipped aircraft.
B-RNAV Used solely for: Terminal Area

RNP-RNAV will be the next major step toward achieving a total RNAV environment enabling maximum use to be made of RNAV capability. Track keeping accuracy will be applicable to prescribed RNP values, typically RNP 0.3 NM and RNP 0.1 NM.
No mandate for RNP-RNAV is foreseen before 2010.
RNP-RNAV: used for En route & Terminal Areas including approaches

About VNAV: VNAV has been touted as the most effective means to manage the vertical component of a non-precision approach (NPA) procedure by avoiding the necessity of levelling-off at the minimum flight altitude along each of the different segments of the procedure.
Some operators have extended the philosophy of VNAV to the point of describing it as an “ILS look-alike.” Others have readily accepted the use of VNAV on non-precision approaches as simply another precision approach!

Valerian E Partenie
TuneVNAV developer

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