ACS Alignment

FAA-S-ACS-16 — Commercial Pilot, Rotorcraft–Helicopter · Area of Operation VI. Performance Maneuvers · Task: A — Rapid Deceleration/Quick Stop

CH.VI.A.S1 — perform a rapid deceleration within tolerances CH.VI.A.K1 — collective/cyclic/pedal coordination CH.VI.A.R1 — rotor RPM, ballooning & tail-clearance CH.VI.A.K2 — entry altitude & airspeed

⚑ FLAG (Walter): confirm Task letter (A) and codes, and the entry parameters appropriate to the R44.

Rapid Deceleration (Quick Stop)

Slow rapidly and bring the helicopter to a stationary hover — a coordination exercise that builds autorotation timing.

By the end of this lesson you can:

Explain the purpose and the control coordination of a rapid deceleration.
Enter at an appropriate altitude/airspeed and decelerate with aft cyclic while lowering collective.
Coordinate pedals and maintain rotor RPM and tail clearance throughout.
Arrive at a stationary, stabilized hover without ballooning or excessive sink.

1 · The maneuver

From a low-altitude air taxi at a moderate airspeed, smoothly apply aft cyclic to decelerate while lowering the collective to prevent ballooning (climbing), adding pedal to keep the nose straight as power changes. As groundspeed washes off, lead with forward cyclic and add collective to arrive at a stationary hover. Despite the name, it is flown smoothly — the emphasis is coordination, not aggression.

2 · Why it matters

The quick stop trains the exact collective/cyclic/pedal coordination and the flare timing you need for the autorotation deceleration and landing. Mastering it makes autorotations smoother and safer.

3 · Common errors

Watch for ballooning (not lowering collective enough as you flare), rotor RPM overspeed (collective too low without managing RPM), heading wander (insufficient pedal), and letting the tail rotor get too low during the nose-up attitude. Keep RPM in the green and the tail clear.

4 · Watch

Curated reference clip — “How To Stop a Helicopter (Quickly) - a Helicopter Rapid Deceleration or Helicopter Quick Stop,” Helicopter Training Videos (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) — Rapid Deceleration 📄 Robinson R44 POH — Normal Procedures

Your aircraft: the recommended entry altitude/airspeed and RPM limits are aircraft-specific — note your R44 figures and rotor RPM limits from the POH.

✍️ Fill in for the aircraft you fly your R44 quick-stop entry altitude/airspeed and the rotor-RPM green range — look these up in the R44 POH 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 quick-stop trap is ballooning or overspeeding the rotor from poor collective coordination, or letting the tail rotor strike in the nose-high attitude. Lower collective as you flare to stay level, keep RPM in the green, add pedal to hold heading, and keep the tail clear of the ground.