Commercial Rotorcraft - Helicopter Study Guide

COMMERCIAL ROTORCRAFT – HELICOPTER STUDY GUIDE (Detailed, ACS-Based)

I. Preflight Preparation

1. Pilot Qualifications

Know:

• Commercial pilot privileges & limitations

  • A person who holds a commercial pilot certificate with a rotorcraft-helicopter rating may:

  • Act as PIC of a helicopter carrying persons or property for compensation or hire.

  • Act as PIC of a helicopter for compensation or hire in operations not requiring an airline transport pilot (ATP) certificate.

  • Conduct aerial work operations, such as:

    • Aerial photography

    • Powerline or pipeline patrol

    • Search and rescue

    • Aerial application (crop dusting, spraying, etc.) (Part 137)

    • Banner towing

    • Helicopter external load operations (Part 133)

    • Sightseeing flights (under Part 91.147 if compliant with LOA requirements)

Limitations:

• Must meet the requirements of the applicable operating rules (e.g., Parts 91, 119, 133 (External Loads), 135 (Air Carrier)).

• Cannot act as PIC in air carrier operations unless meeting the certification and training requirements under Part 135 or 121.

• May not act as PIC for hire in a passenger-carrying operation unless the operator holds the appropriate certificate or authorization (such as an Air Carrier or Operating Certificate).

• 61.133 no limitations for rotorcraft.

• Currency requirements (day, night, passengers, flight review):

  • Flight Review (FAR 61.56 Pg 77)

  • No person may act as PIC of an aircraft if they have not done a flight review and received an endorsement from an authorized instructor within the previous 24 calendar months.

  • A flight review must consist of a minimum of a 1-hour ground and 1-hour flight.

  • Student pilots are exempt.

  • Recent Flight Experience (FAR 61.57 Pg 78)

  • No person may act as PIC of an aircraft carrying passengers during the day unless they have completed 3 takeoffs and landings within the last 90 days in an aircraft of the same category, class, and type.

  • The same requirements exist for night but landings must be completed 1 hour after sunset and 1 hour before sunrise.

  • Night currency transfers to day currency/Day currency does not transfer to night.

• Logging PIC time & commercial operations:

  • Each Log Entry Must Include

  • Date

  • Total Flight Duration

  • Departure and Arrival Location

  • Aircraft type and identification (N-number)

  • Name of safety pilot (if used)

  • Conditions of flight (day, night, actual/simulated instrument)

  • Type of experience or training (PIC, SIC, dual received, solo, CFI, etc.)

  • Type of experience or training (PIC, SIC, dual received, solo, CFI, etc.)

  • May Log PIC when:

    • You’re the sole manipulator of the controls of an aircraft you’re rated in.

    • You’re the sole occupant (solo).

    • Acting as PIC in a required multi-pilot crew.

2. Medical Certificates (2nd class requirements)

Operating without an instrument rating

Be able to explain:

• Why commercial pilots need higher standards (PAVE/ADM)

  • Risk Management / Decision-Making

  • Apply the PAVE checklist:

    • Pilot: Am I fit to fly? (IMSAFE)

    • Aircraft: Is the R22 within weight/CG limits? Maintenance current?

    • enVironment: Weather, terrain, wires, confined areas.

    • External pressures: Am I feeling rushed?

• Aeronautical Decision Making (ADM)

  • A Systematic approach to the mental processes used by pilots to consistently determine the best course of action in response to a certain set of circumstances.

  • Over 80% of all aviation accidents are caused directly by human error and decision making.

What types of compensation you can and cannot receive?

• Even as a commercial pilot, there are limits:

  • I cannot hold out to the public as a common carrier unless operating under Part 135 or 121.

  • I cannot conduct charter flights or on-demand passenger transport without a Part 135 certificate.

  • I cannot fly for hire if I don’t hold the proper category/class/rating (e.g., no external load ops without the rating).

  • I cannot be compensated in a way that creates flight time logging fraud or violates care and judgment rules.

  • I cannot accept compensation for private pilot–level operations (point-to-point passenger transport) unless the operation is specifically allowed under commercial privileges.

3. Airworthiness Requirements

Know the required documents: AROW

• A: Airworthiness Certificate

• R: Registration

• O: Operating Limitations

• W: Weight & Balance

Inspections: A1LATE

• A: Annual Inspection

• 1: 100 hour inspection

• L: Life limited parts

• A: Airworthiness Directives (ADs) & Service Bulletins (SBs)

• T: Transponder

• E: Emergency Locator Transmitter (ELT)

  • Transponder is inspected every 24 calendar months.

  • ELT is inspected within 12 calendar months of the last inspection, when used for more than 1 cumulative hour, after 50% of their useful life has expired or half dead.

Be able to perform:

• Step-by-step determination of airworthiness using logbooks.

• MEL vs. inoperative equipment (91.213)

  • Inoperative Equipment (91.213)

  • No person may take off an aircraft with inoperative equipment unless:

    • An approved Minimum Equipment List exists for that aircraft.

    • The aircraft has in it a letter of authorization from the responsible Flight Standards office, authorizing operation under the MEL.

    • The aircraft records available to the pilot must include an entry describing the inoperable equipment.

MEL/MMEL:

• Minimum Equipment List (MEL)

  • Is built out of a Master Minimum Equipment List (MMEL)

  • Is generated by an owner/operator and approved by the FAA

  • Lists components required for flight on a specific aircraft's Master Minimum Equipment List, which is generated by the manufacturer and approved by the FAA.

4. AD compliance

• Airworthiness Directives and Service Bulletins

  • ADs are legally enforceable regulations issued by the FAA to correct unsafe conditions in the aircraft, engines & other equipment.

  • The purpose of ADs is to ensure continued airworthiness and safety of the aircraft.

• Process of ADs:

  1. Notice of Proposed Rulemaking (NPRM)

  • This is the standard process where the FAA publishes a proposed solution to an unsafe condition. The public has a period to provide comments.

  1. Final Rule with Request for comments (FRC)

  • This rule is used when urgent action is needed but public comments are still allowed after the action has been implemented.

• Stable

  • Cool, dry air, it's colder than its surroundings, so it sinks and condenses, spins clockwise.

  • Unstable

  • Warm, moist air, it's warmer than its surroundings, so it rises and expands, spins counterclockwise.

5. Weather

Understand the structure of weather needed to make safe decisions:

Key Weather Concepts

• High/Low Pressure System:

  • High Pressure: Surrounded on all sides by lower pressure.

  • Ridge: Elongated area of high pressure.

  • Air flows clockwise, down, and out.

  • Low Pressure: Surrounded by higher pressure.

  • Trough: Elongated area of low pressure.

  • Air flows counterclockwise, up, and in.

  • Visibility: Poor

  • Clouds: Stratus

  • Turbulence: None

  • Ice: Rime

  • Precipitation: Steady

  • Pressure: High Pressure

Air Masses

• An air mass is a large body of air with uniform temperature and humidity that affects surface weather.

• Classification of Air Masses (by source region):

  • Continental (dry) or maritime (moist)

  • Polar (cold) or tropical (warm)

Air Mass Designations:

• cA — Continental Arctic: Extremely cold, very dry.

• cP — Continental Polar: Cold, dry, stable (Common winter air over Canada/U.S.).

• cT — Continental Tropical: Hot, dry (Forms over deserts, e.g., Southwest U.S.).

• mP — Maritime Polar: Cool, moist (North Pacific and North Atlantic).

• mT — Maritime Tropical: Warm, humid (Gulf of Mexico, Caribbean, warm Atlantic/Pacific).

• mE — Maritime Equatorial (rare in CONUS): Very warm, extremely moist (Deep tropical regions near the equator).

Frontal Systems

Types of Fronts (PPM 6-28):

• Warm Front:

  • Warm air replacing cold air, causes temperature inversion & wind shear.

• Occluded Front:

  • Occurs when a fast-moving cold front catches up to a slow-moving warm front & smashes it between another cold front.

• Cold Front:

  • Cold air displaces warm air, creates thunderstorms ahead of the frontal location.

• Stationary Front:

  • Very little to no movement, rain occurs where two fronts meet & can influence weather in the area for days.

Clouds

• Cloud Formation:

  • Clouds form when air is cooled to its dew point (or becomes saturated) and water vapor condenses into tiny droplets or ice crystals.

  • Cooling usually happens when air rises and expands (adiabatic cooling), but can also result from contact cooling, mixing, or adding moisture.

Types of Clouds

High Clouds (Above ~20,000 ft AGL)

• Cirrus (Ci): Wispy, hairlike clouds formed from sublimation of ice crystals in very cold, stable air.

• Cirrostratus (Cs): Thin, sheet-like clouds covering the sky, often produce halos around the sun/moon.

• Cirrocumulus (Cc): Small, white patches or ripples — “mackerel sky.”

Middle Clouds (6,500–20,000 ft AGL)

• Altostratus (As): Gray/blue-gray layer, covers sky, sun looks like it’s behind frosted glass.

• Altocumulus (Ac): White/gray patches, may appear as rolls or rounded masses.

Low Clouds (Surface–6,500 ft AGL)

• Stratus (St): Uniform gray layer, can bring drizzle or mist (like fog but not on the ground).

• Stratocumulus (Sc): Low, lumpy clouds covering much of the sky.

• Nimbostratus (Ns): Thick, dark clouds producing steady precipitation.

Thunderstorm Life Cycle

• Thunderstorms require moisture, unstable air, and a lifting mechanism. They go through three stages:

  • Cumulus (updrafts): Strong rising air builds towering cumulus clouds.

  • Mature (strong up- and downdrafts, heavy precipitation, turbulence): Most dangerous stage.

  • Dissipating (downdrafts dominate): Precipitation tapers off, storm begins to lose energy.

Hazards Associated with Thunderstorms

• Severe turbulence, hail, lightning, icing, wind shear, and microbursts.

• As a pilot, avoid thunderstorms by at least 20 miles.

• If inadvertently encountered, slow to maneuvering speed, maintain level flight, and ride it out.

Windshear

• Windshear: A sudden change in wind speed and or direction over a relatively short distance. It can occur horizontally or vertically and can significantly affect aircraft performance, especially close to the ground.

• Vertical Windshear: Calm surface wind but winds aloft are 30 kts, causing rapid changes in climb rate and power required.

• Microburst: A dangerous source of wind shear, occurring horizontally over 1 nautical mile or less and vertically less than 1,000ft.

Fog Formation

• Types of Fog:

  • Steam Fog (Evaporation Fog): Occurs when cold dry air moves over warm water.

  • Upslope Fog: Occurs when moist air is forced up a slope and cools adiabatically.

  • Radiation Fog: Occurs overnight on clear, calm nights when the ground cools below the dew point.

  • Advection Fog: Occurs when warm moist air moves over a colder surface.

• Precipitation Fog: Occurs when warm rain falls through cooler air near the surface.

6. Performance & Limitations

Critical Aerodynamic Concepts

• Dissymmetry of Lift:

  • Is the differential (unequal) lift between advancing and retreating halves of the rotor disk caused by the difference in relative wind between advancing and retreating blades.

• Retreating Blade Stall: Occurs when the relative airflow over the advancing side is higher due to forward speed, causing increasing dissymmetry of lift, which can result in a stall and loss of lift.

Recovery Methods

• For Vortex Ring State: Lower collective to reduce AOA, apply aft cyclic, correct for any roll.

• For Low RPM conditions: Lower collective and roll on throttle.

• Dynamic Rollover:

  • Most commonly occurs when hovering near the surface, to correct simply remove any one of the three ingredients: rolling moment, thrust greater than weight, or pivot point other than the helicopter’s center of gravity.

7. Aircraft Systems

You must be able to explain these from memory:

• Fuel System: Gravity-flow (no fuel pumps) and includes a main tank, an optional auxiliary tank, and more.

• Electrical System: 14-volt DC system with alternator and sealed lead-acid battery.

• Flight Control System: Actuated through control rods and various mechanisms.

8. Human Factors

Know:

• Stress & Fatigue / IMSAFE checklist: Factors affecting performance and decision-making.

• Hypoxia (four types: Hypoxic, Hypemic, Stagnant, Histotoxic) and symptoms associated with it.

• Decision-making models: Aeronautical Decision Making (ADM) for enhanced safety.

II. Preflight Procedures

1. Preflight Inspection

Be able to:

• Walk through your helicopter’s POH preflight verbally.

• Identify critical components (mast, hub, rotor blades, TR blades, pitch links).

• Understand indications of blade delamination, leaks, bearing wear, and mast bumping risks.

2. Cockpit Management

• Crew Resource Management (CRM): Using all available resources to maintain safety.

• Maintain situational awareness through continuous monitoring and workload management strategies.

III. Airport Operations

Know:

• Controlled vs. uncontrolled communications, light gun signals, helicopter-specific pattern entries, avoiding wake turbulence, and operational procedures around fixed-wing traffic.

IV. Hovering & Taxi

Hovering Basics

• Steps to execute a successful hover, including managing RPM, collective control, and aircraft stability.

Hovering Turns

• Utilizing the pedals for controlling turns while maintaining altitude and trajectory control.

Taxiing Operations

• Differences between hover taxi and air taxi, including application scenarios and hazards associated with each.

V. Takeoffs & Landings

Normal Takeoff and Landing Procedures

• Description of the standard processes of taking off and landing a helicopter, including speed, altitude, and attitude management.

Special Takeoff Procedures

• Max performance takeoff techniques, and procedures for steep approaches and running landings adjusted for various conditions.

VI. Performance Maneuvers

Autorotation Techniques

• Methods for entering and managing autorotative flight under different altitude scenarios, including 180° autorotation techniques.

Confined Area Operations

• Procedures and considerations for safely conducting operations in confined areas or over obstacles, summarized as WOTFEEL methodology.