★ PTS mapping: This lesson aligns to FAA-S-8081-20A (Nov 2023), Area of Operation IV — Inflight Maneuvers (per Lesson→Area map). It is a PTS, so items are Tasks/elements (no ACS K/R/S codes); read the exact Task lettering and tolerances from the current published PTS.
Recognize the failure, protect rotor RPM, and fly the right response — single-engine autorotation or OEI continued flight.
A powerplant failure announces itself through a cluster of cues: a yaw (in a single-engine helicopter, the loss of driving torque changes the pedal demand), a change in noise and vibration, decaying engine instruments (N1/N2, torque, manifold pressure, fuel flow), and — critically — rotor RPM (Nr) beginning to decay if collective is not adjusted. Warning lights, horns, and low-Nr aural warnings may also fire. The ATP-level pilot is trained to recognize the failure quickly and correctly, because the time available to protect Nr is measured in seconds, and a delayed or misdiagnosed response is far more dangerous than the failure itself.
In a single-engine helicopter (such as the R44), a complete powerplant failure leaves the rotor with only its stored energy and the airflow of descent to keep turning. The immediate, memorized response is to lower the collective to protect rotor RPM, establish the autorotative airspeed and attitude, control heading with pedals, and select a landing area. The freewheeling unit (autorotation/sprag clutch) disconnects the dead engine so the rotor can turn freely. Detailed autorotative approach and landing technique is covered in its own lesson; the key point here is the immediate recognition-and-protect-Nr reflex, because rotor RPM lost in the first seconds may be unrecoverable.
| Immediate action | Why |
|---|---|
| Lower collective | Reduces blade pitch/drag so descending airflow keeps Nr in the operating band. |
| Set autorotation airspeed/attitude | Optimizes glide and rotor energy toward the chosen landing area. |
| Pedals for heading/trim | Without engine torque the antitorque demand changes; keep the aircraft in trim. |
| Select landing area & commit | Energy is finite; an early, decisive choice preserves options. |
In a multi-engine helicopter, the loss of one engine (one-engine-inoperative, OEI) is fundamentally different: the remaining engine(s) may allow continued flight, often by entering an OEI power regime (sometimes time-limited contingency ratings such as a 30-second / 2-minute / continuous OEI power). The pilot must recognize which engine failed, control yaw and Nr, set the appropriate OEI power, and decide — based on the OEI performance available, weight, density altitude, and the flight phase — whether to continue (fly away) or land. This is where the operational categories (Performance Class / Category A vs B procedures) and the height-velocity considerations for OEI become decisive. OEI maneuvering is an ATP-level multi-engine skill that the single-engine autorotation response does not address.
✈️ Your test aircraft: the OEI continued-flight material in this section applies only to multi-engine helicopters. The single-engine R-44 has no OEI case — its only powerplant-failure response is entry to autorotation. ATP-H practical tests are normally flown in a turbine and/or multi-engine, IFR-capable helicopter — use your actual test aircraft's OEI ratings, limits, and procedures from its RFM/POH for items marked aircraft-specific.
Curated reference clip — “Helicopter Engine Failure: How to Land Safely (Autorotation Tutorial)” · Pilot Yellow (YouTube), verified via oEmbed. Embedded with the creator's player; we don't host or alter it.
✈️ Your test aircraft: the R-44 fill-in values cover its single-engine, piston, VFR figures. ATP-H practical tests are normally flown in a turbine and/or multi-engine, IFR-capable helicopter — use your actual test aircraft's data (OEI/IFR/limits/performance as relevant) from its RFM/POH for items marked aircraft-specific. For OEI tasks: the single-engine R-44 has no OEI case — a power loss is an autorotation; OEI continued-flight applies only to multi-engine test aircraft.