AA.VI.D.K1FAA-S-ACS-11A · Nov 2023Knowledge
Procedures and limitations associated with a non-precision approach, including the diff...
Procedures and limitations associated with a non-precision approach, including the differences between Localizer Performance (LP) and Lateral Navigation (LNAV) approach guidance.
Bottom line
LNAV and LP are RNAV non-precision approaches without approved vertical guidance, so they should be flown using a CDFA technique whenever possible. CDFA is a technique for flying the final approach segment of an NPA as a continuous descent with no level off. Below the authorized MDA, the aircraft must be continuously in a position from which a descent to a landing on the intended runway can be made at a normal rate of descent using normal maneuvers.
Key numbers
| Number | What it means |
|---|---|
| as low as 250 ft above the ground in IMC | Dive-and-drive floor |
| approximately 50 ft above the landing runway threshold | CDFA endpoint |
| not below 100 ft above the touchdown zone elevation | Approach lights limit |
FAA references
- AC 120-108 ch. 4 List of Tables — AC No: 120-108A
- 14 CFR 91.175 (Takeoff and landing under IFR.) — eCFR current as of 2026-03-05
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