CH.VIII.F — Low Rotor Revolutions Per Minute (RPM) Recognition and Recovery

What does ACS code CH.VIII.F cover?

ACS Code CH.VIII.F covers "Low Rotor Revolutions Per Minute (RPM) Recognition and Recovery" under Area of Operation VIII (Emergency Operations) for the FAA Commercial Pilot Helicopter certificate (FAA-S-ACS-16). Candidates are tested on knowledge elements and risk management factors defined in 14 CFR regulations and FAA handbooks (PHAK / AFH).

Task Specification & Required References

• ACS Document: FAA-S-ACS-16 (Commercial Pilot Helicopter)
• Area of Operation: Area VIII — Emergency Operations
• Task: Task F — Low Rotor Revolutions Per Minute (RPM) Recognition and Recovery
• Primary FAA Sources: Pilot's Handbook of Aeronautical Knowledge (FAA-H-8083-25), Airplane Flying Handbook (FAA-H-8083-3) / Helicopter Flying Handbook (FAA-H-8083-21), Aviation Weather Handbook (FAA-H-8083-28), 14 CFR Parts 61, 91 & 107, Aeronautical Information Manual (AIM).

Airman Certification Standards Elements

Knowledge Elements

• CH.VIII.F.K1: Elements related to low rotor rpm recovery energy management, including the combination of conditions that may lead to this situation.
• CH.VIII.F.K2: Effects of wind, weight, temperature, and density altitude.
• CH.VIII.F.K3: Aerodynamics that affect low rotor rpm conditions.
• CH.VIII.F.K4: Powerplant performance.
• CH.VIII.F.K5: Main rotor (Nr) limitations.
• CH.VIII.F.K6: Difference between low rotor rpm and blade stall.

Risk Management Elements

• CH.VIII.F.R1: Powerplant limitations.
• CH.VIII.F.R2: Powerplant governor operation.
• CH.VIII.F.R3: Collision hazards.
• CH.VIII.F.R4: Distractions, task prioritization, loss of situational awareness, or disorientation.
• CH.VIII.F.R5: Low inertia rotor systems.

How do I study CH.VIII.F?

1. Read each element for CH.VIII.F in FAA-S-ACS-16 and note any you cannot explain in your own words.
2. Study each one in the FAA source it points to: the handbook chapter, the 14 CFR section or the AIM paragraph.
3. Practice with questions tagged CH.VIII.F, and read the explanation for every miss.
4. Retest, then review the ACS codes you still miss on your practice test report.

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Related ACS tasks

• Previous task: CH.VIII.E — Vortex Ring State (VRS)
• Next task: CH.VIII.G — Antitorque System Failure
• Same area: CH.VIII.A — Powerplant Failure in a Hover in a Single-Engine Helicopter
• Same area: CH.VIII.B — Powerplant Failure at Altitude in a Single-Engine Helicopter
• Same area: CH.VIII.C — Approach and Landing with One Engine Inoperative (OEI) (Simulated)
• Same area: CH.VIII.D — Systems and Equipment Malfunctions
• Same area: CH.VIII.E — Vortex Ring State (VRS)
• Same area: CH.VIII.G — Antitorque System Failure