ACS Alignment

FAA-S-ACS-16 — Commercial Pilot, Rotorcraft–Helicopter · Area of Operation I. Preflight Preparation · Task: F — Performance and Limitations

CH.I.F.K1 — factors affecting performance (DA, wind, weight) CH.I.F.K2 — hover ceilings (IGE/OGE), HV diagram, W&B CH.I.F.R1 — operating near performance limits CH.I.F.S1 — compute performance from POH charts

⚑ FLAG (Walter): confirm Task letter (F) and codes; all performance numbers must come from the R44 POH charts — none are provided here.

Performance & Limitations

Density altitude, weight, and wind decide whether the helicopter can do what you ask — compute it, don’t guess.

By the end of this lesson you can:

Explain how density altitude, weight, and wind affect hover and climb performance.
Read IGE and OGE hover-ceiling charts and the height-velocity (HV) diagram.
Apply weight & balance limits and the published limitations.
Compute take-off/hover capability for the actual conditions from the POH.

1 · What drives performance

High density altitude (hot, high, humid) thins the air, reducing rotor thrust and engine power; weight raises the power required to hover and climb; wind generally helps (translational lift). The interaction decides whether you can hover out of ground effect, clear an obstacle, or operate from a confined area. A commercial pilot computes this for the actual day, not a memorized average.

2 · IGE/OGE hover & the HV diagram

In ground effect (IGE) hovering needs less power than out of ground effect (OGE); a hover you can hold IGE may be impossible OGE or at high DA. The height-velocity (HV) diagram shows combinations of height and airspeed from which a safe autorotative landing is unlikely after a power loss — avoid those regions. Read your R44 POH charts for the day’s weight and DA.

3 · Limitations & weight and balance

Honor the published limits: never-exceed speed (V_NE, which varies with DA/weight), rotor RPM limits, manifold-pressure/power limits, and the weight & balance envelope across the flight as fuel burns. Operating near a limit removes your margin for gusts, errors, or an engine that is not making book power.

4 · Watch

Curated reference clip — “What is Density Altitude? — Performance Challenges for Helicopters” · Ryan Dale (YouTube), verified via oEmbed. Embedded with the creator’s player; we don’t host or alter it.

5 · Reference sources

Use the authoritative references

📄 Helicopter Flying Handbook (FAA-H-8083-21) — Performance 📄 Pilot’s Handbook (FAA-H-8083-25) — Aircraft Performance & Weight and Balance

Your aircraft: every performance number — IGE/OGE hover ceiling, climb, V_NE variation, and the W&B envelope — is aircraft-specific and comes from the R44 POH (Performance / Limitations / Weight & Balance).

✍️ Fill in for the aircraft you fly today’s density altitude and your R44 IGE and OGE hover capability, V_NE, and the W&B result for the planned load — compute from the R44 POH charts and confirm with your CFI.

⚑ FLAG (Walter): the R44 is a VFR-certificated piston helicopter; confirm the aircraft/figures the student actually flies and that all numbers come from the current R44 POH.

Risk management (the “Consider”): the performance trap is a marginal OGE hover at high DA — you commit to a confined area or a downwind hover the aircraft cannot sustain. Compute IGE/OGE capability for the real conditions, keep a power margin, plan the takeoff path with an escape, and respect the HV diagram.