ACS Alignment

FAA-S-ACS-8 — Instrument Rating, Rotorcraft–Helicopter · Area of Operation VI. Instrument Approach Procedures · Task: A — Nonprecision Approach (NPA)

IR.VI.A.K1 — NPA types & MDA/VDP/CDFA concepts IR.VI.A.K2 — required equipment, fixes & timing IR.VI.A.S2 — fly an NPA within standards to MDA & MAP IR.VI.A.R1 — risk: descending below MDA without references

⚑ FLAG (Walter): confirm Task letter (A) and the exact K/R/S sub-numbers for the helicopter NPA Task in the current FAA-S-ACS-8, and confirm the published tolerances (e.g., MDA +100/−0 ft) for the rotorcraft standard.

Nonprecision Approaches (LNAV / VOR / LOC)

No glidepath — fly to a Minimum Descent Altitude, then to the missed-approach point and decide.

By the end of this lesson you can:

Explain what makes an approach nonprecision (lateral guidance only — LNAV, VOR, LOC) and how it differs from a precision approach.
Identify the FAF, step-down fixes, MDA, VDP, and the missed-approach point (MAP) by fix, time, or distance.
Use a continuous descent final approach (CDFA) profile rather than diving and driving.
Recognize that you may not descend below MDA without the required visual references and a normal landing position.

1 · What “nonprecision” means

A nonprecision approach provides lateral course guidance but no vertical (electronic glidepath) guidance — examples are LNAV (GPS), VOR, and localizer (LOC). Because there is no glideslope, the procedure protects you with a Minimum Descent Altitude (MDA): a hard floor you may level at, but not go below, until you have the runway environment in sight and are in a position for a normal landing. Some WAAS units show an advisory glidepath (LNAV+V); it aids situational awareness but is not certified vertical guidance, and the MDA still applies.

2 · The fixes that structure the approach

Element	What it does
FAF	Final approach fix — start the final descent, timing, and the before-landing flow here.
Step-down fix(es)	Intermediate altitude restrictions on the way to the MDA — don't descend early.
MDA	The lowest you may go without the required visual references. Level here if not yet visual.
VDP	Visual descent point (if charted) — the point from which a normal descent to landing can begin once visual.
MAP	Missed-approach point — defined by a fix, a DME/GPS distance, or timing from the FAF.

3 · CDFA — fly a stabilized profile

The modern technique is a continuous descent final approach: compute a steady descent rate from the FAF that arrives at the MDA at (or just before) the VDP, and fly that profile smoothly rather than dropping to the MDA early and driving level (“dive and drive”). CDFA keeps the aircraft stabilized and reduces controlled-flight-into-terrain risk. If you reach the MDA and the runway is not in sight, hold the MDA to the MAP, then execute the missed approach — do not descend further hoping to break out.

4 · Watch

Curated reference clip — “How to Fly a Non Precision Approach | Continuous Descent Final Approach | LNAV + V,” FlightInsight (YouTube), verified via oEmbed. Embedded with the creator's player; we don't host or alter it.

5 · Reference sources

Use the authoritative references

📄 Instrument Flying Handbook (FAA-H-8083-15B) — Ch.10 IAPs (Nonprecision) 📄 Instrument Procedures Handbook (FAA-H-8083-16) — Approach Procedures

Your aircraft: the final-approach airspeed you fly sets your descent rate and approach category — note your R44's normal approach speed from the POH Section 4 (Normal Procedures) and confirm the resulting category.

✍️ Fill in for the aircraft you fly Final-approach airspeed and the descent rate it gives at that speed (ft/min for a ~3° path), plus your approach category — look it up in the R44 POH (Normal Procedures) and confirm with your CFI.

⚑ FLAG (Walter): the R44 is a VFR-certificated helicopter; confirm NPAs are flown in an IFR-approved trainer/sim and whether any helicopter (“COPTER”) NPAs or reduced minima are in scope.

Risk management (the “Consider”): the nonprecision killer is descending below MDA without the required visual references — CFIT happens here. Honor every step-down, level at MDA if not visual, and treat the MAP as a commitment, not a suggestion. Brief the MAP, timing, and VDP before the FAF so you are flying the plan, not building it.