Your destination is Longview, Texas, KGGG. Pilots “may flight plan to use any instrument approach procedure authorized for use with their WAAS avionics as the planned approach at a required alternate.”ĪIM 1-1-18(d)(1)(b) requires that the aircraft “must be equipped with an approved and operational alternate means of navigation appropriate to the flight.” Also, “active monitoring of an alternate means of navigation is required when the RAIM capability of the GPS equipment is lost.” GPS Flight Planning Scenario #1.The WAAS alternate airport rules, as of 8 January 2015, can be found under AIM 1-1-19(c)(9)(a): There is a separate section under AIM 1-1-19 governing GPS with WAAS capability. The GPS rules for operating with WAAS are not in the GPS section of the AIM. Language left over from AIM 1-2-3(d) and Notice N 8900.218 indicate the non-GPS approach at the other location is required to “be flown without reliance on GPS.”.A preflight RAIM prediction for the destination or the alternate airport is required.Pilots may plan for LNAV or CIRCLING minimums only, unless equipped for baro-VNAV.Pilots “may file based on a GPS-based IAP at either the destination or the alternate airport, but not at both locations.”.I found four basic rules for flying GPS without WAAS: That notice expired in 2014.Ģ014 – AIM 1-1-18(g)(1) superseded the obscure notice, making the alternate airport rules somewhat easier to find.Ģ015 – The published 2015 FAR/AIM is already obsolete because the rules changed again on 8 January 2015.
#Do you need waas for lnav vnav how to
I’m starting with destination rules, because most flight plans begin with that basic question: Where to go and how to get there?Ģ013 – If you were aware of these rules a couple years ago, you knew to look them up in Published NOTAM No. Where to find the answers? Destination Alternates – Without WAAS
Or maybe the rules have changed too many times to remember the current limitations. Maybe the airplane has an old receiver without WAAS capability. It’s time to review the rules for planning an IFR flight with GPS navigation.
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