PH.VIII.E — Vortex Ring State (VRS)

What does ACS code PH.VIII.E cover?

ACS Code PH.VIII.E covers "Vortex Ring State (VRS)" under Area of Operation VIII (Emergency Operations) for the FAA Private Pilot Helicopter certificate (FAA-S-ACS-15). 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-15 (Private Pilot Helicopter)
• Area of Operation: Area VIII — Emergency Operations
• Task: Task E — Vortex Ring State (VRS)
• 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

• PH.VIII.E.K1: Elements of vortex ring state.
• PH.VIII.E.K2: Effects of wind, weight, temperature, and density altitude.
• PH.VIII.E.K3: Requirements for the formation of VRS.
• PH.VIII.E.K4: Aerodynamics and indications of VRS.
• PH.VIII.E.K5: Flight scenarios under which VRS can occur.
• PH.VIII.E.K6: Effective recovery techniques.

Risk Management Elements

• PH.VIII.E.R1: Pilot recognition and response to VRS.
• PH.VIII.E.R2: Entering the maneuver at a lower altitude than planned.
• PH.VIII.E.R3: Application of power or exceeding powerplant limitations.
• PH.VIII.E.R4: Collision hazards.
• PH.VIII.E.R5: Distractions, task prioritization, loss of situational awareness, or disorientation.
• PH.VIII.E.R6: Loss of tail rotor effectiveness (LTE).

How do I study PH.VIII.E?

1. Read each element for PH.VIII.E in FAA-S-ACS-15 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 PH.VIII.E, 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: PH.VIII.D — Systems and Equipment Malfunctions
• Next task: PH.VIII.F — Low Rotor Revolutions Per Minute (RPM) Recognition and Recovery
• Same area: PH.VIII.A — Powerplant Failure in a Hover in a Single-Engine Helicopter
• Same area: PH.VIII.B — Powerplant Failure at Altitude in a Single-Engine Helicopter
• Same area: PH.VIII.C — Approach and Landing with One Engine Inoperative (OEI) (Simulated)
• Same area: PH.VIII.D — Systems and Equipment Malfunctions
• Same area: PH.VIII.F — Low Rotor Revolutions Per Minute (RPM) Recognition and Recovery
• Same area: PH.VIII.G — Antitorque System Failure