North Country Heli FlightHELICOPTER GROUND SCHOOL · ACS-ALIGNED
Private (PPL-H) · Lesson 27

ACS Alignment

FAA-S-ACS-15 — Private Pilot, Rotorcraft–Helicopter · Area of Operation IX. Emergency Operations · Task: Powerplant & Systems Malfunctions
PA.IX.A.K1 — engine/powerplant malfunction indications PA.IX.A.K2 — systems failures (hydraulic, electrical, governor) PA.IX.A.R1 — risk: misdiagnosis, delayed action PA.IX.A.S1 — execute correct memory items

Powerplant & Systems Malfunctions

Recognizing what's wrong and flying the right memory items.

By the end of this lesson you can:

1 · Powerplant malfunctions

Engine problems show up as RPM changes, abnormal gauges (MAP, oil pressure/temperature), noises, vibrations, or warning lights. The universal first priority is fly the aircraft — protect rotor RPM and airspeed, establish an attitude, pick a landing area — then run the POH procedure. A complete power loss is handled by autorotation (covered in Lesson 28); a partial power loss is flown per the POH while heading toward a landing option.

2 · Systems failures

Hydraulic failure changes control feel (forces increase) — the response is to maintain control and follow the POH, often landing as conditions allow. Electrical issues (alternator/charging) call for load management per the POH. A governor failure means managing throttle/RPM manually. In all cases the pattern is the same: keep flying, identify the failure, and run the correct POH memory items — never guess.

3 · Watch

Curated reference clip — “Landing a Helicopter When the Engine Quits | Autorotation Training,” Micah Muzio (YouTube). Embedded with the creator's player; we don't host or alter it.

4 · Reference sources

Use the authoritative references

📄 FAA Helicopter Flying Handbook, Ch. 11 — Helicopter Emergencies & Hazards 📄 FAA HFH, Ch. 4 — Components, Sections & Systems
Your aircraft: the exact emergency procedures and memory items are in your Robinson R44 POH, Section 3 (Emergency Procedures). These steps are aircraft-specific — learn and confirm them from the POH, not from this overview.
✍️ Fill in for the aircraft you fly (N-________)
Value / limit:
R44 POH section & page:
Leave blank until you look it up in your R44 POH (see the reference above) and confirm it with your CFI. Aircraft-specific numbers vary with weight & conditions — don’t guess.
Risk management (the “Consider”): the two failure modes that hurt people are misdiagnosis (treating the wrong problem) and delay (analyzing instead of flying). Fly first — RPM and airspeed — then diagnose, then act with the correct POH procedure. Practiced memory items turn a startle into a sequence you can execute.

5 · Knowledge check