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Night Illusion
A visual or vestibular misperception more likely at night when outside references are limited, such as false horizons, autokinesis, or featureless-terrain approach illusions. Night training emphasizes recognizing illusions, trusting instruments and lighting cues, and using conservative approach and go-around criteria.
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Learn more in Private Pilot License →Related Terms
- Non-Precision ApproachAn instrument approach procedure that provides lateral guidance to the runway but does not include an electronic glideslope for vertical guidance. Examples include localizer-only, VOR, and many RNAV (GPS) LNAV approaches; pilots descend to a minimum descent altitude (MDA) and must see the runway environment to continue.
- Nontowered AirportAn airport without an operating control tower where pilots self-announce and sequence using CTAF/UNICOM procedures. Nontowered operations still require traffic-pattern discipline and wake-turbulence awareness around larger arrivals and departures.
- NOTAM (Notice to Air Missions)A notice containing information concerning the establishment, condition, or change in any aeronautical facility, service, procedure, or hazard. Pilots are required to check NOTAMs during preflight planning.
- Operating LimitationsThe approved limits and procedures for an aircraft, found in the AFM/POH, placards, and instrument markings. Under 14 CFR 91.9, these limitations must be available in the aircraft, and operating contrary to them is prohibited. Operating limitations are the "O" in the ARROW documents mnemonic.