In aviation, lateral navigation (LNAV, usually pronounced el-nav) is azimuth navigation, without vertical navigation (VNAV). Area navigation (RNAV) approach plates include LNAV as a non-precision instrument approach (NPA). When combined with VNAV, the resulting instrument approach, LNAV/VNAV, is referred to as an Approach with Vertical Guidance (APV). [1]
Instrument approaches
An LNAV approach is flown to a Minimum Descent Altitude, MDA, while an LNAV/VNAV approach is flown to a Decision Altitude, DA. If WAAS becomes unavailable, a GPS or WAAS equipped aircraft can revert to the LNAV MDA using GPS only. [1]: 4–24, 4–26
Autopilots
LNAV is also the name of an autopilot lateral ( roll) mode on several aircraft. In Boeing aircraft, when in LNAV mode, the autopilot will follow the lateral flight path programmed in to the Flight Management Computer. [2]
See also
External links
- FAA: LNAV (Lateral Navigation) (archived version)
References
- ^ a b Instrument Procedures Handbook, FAA-H-8083-16B (PDF). US Dept. of Transportation, FAA Flight Standards Service. 2017. p. 4-26,4-50, G-6.
- ^ "RNAV, RNP, LNAV and VNAV Operations - Overview - Posts - Flaps 2 Approach". www.flaps2approach.com. Retrieved 28 May 2023.
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In aviation, lateral navigation (LNAV, usually pronounced el-nav) is azimuth navigation, without vertical navigation (VNAV). Area navigation (RNAV) approach plates include LNAV as a non-precision instrument approach (NPA). When combined with VNAV, the resulting instrument approach, LNAV/VNAV, is referred to as an Approach with Vertical Guidance (APV). [1]
Instrument approaches
An LNAV approach is flown to a Minimum Descent Altitude, MDA, while an LNAV/VNAV approach is flown to a Decision Altitude, DA. If WAAS becomes unavailable, a GPS or WAAS equipped aircraft can revert to the LNAV MDA using GPS only. [1]: 4–24, 4–26
Autopilots
LNAV is also the name of an autopilot lateral ( roll) mode on several aircraft. In Boeing aircraft, when in LNAV mode, the autopilot will follow the lateral flight path programmed in to the Flight Management Computer. [2]
See also
External links
- FAA: LNAV (Lateral Navigation) (archived version)
References
- ^ a b Instrument Procedures Handbook, FAA-H-8083-16B (PDF). US Dept. of Transportation, FAA Flight Standards Service. 2017. p. 4-26,4-50, G-6.
- ^ "RNAV, RNP, LNAV and VNAV Operations - Overview - Posts - Flaps 2 Approach". www.flaps2approach.com. Retrieved 28 May 2023.
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