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ANAC Agricultural Pilot Helicopter (PAGH) study materials
ANAC Agricultural Pilot Helicopter (PAGH) study resources

ANAC Agricultural Pilot Helicopter (PAGH) practice questions

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Question 1Air Law, ANAC Regulations and Agricultural Aviation Rules

Under ANAC rules for agricultural aviation, what is the primary purpose of the agricultural pilot helicopter licence (PAGH)?

  1. To allow the holder to perform instrument flights under IFR in controlled airspace
  2. To allow the holder to transport passengers commercially in urban areas
  3. To allow the holder to act as a flight instructor in any category of aircraft
  4. To allow the holder to conduct aerial application of agricultural products and related specialized operations Correct answer.

Explanation

The PAGH licence is a specialized authorization that qualifies the holder to perform agricultural aviation activities, chiefly aerial application of pesticides, fertilizers and similar products, along with associated specialized operations. It is not a general commercial transport, instrument, or instructor authorization, which each require separate qualifications and endorsements.

Question 2Air Law, ANAC Regulations and Agricultural Aviation Rules

Which document must an agricultural pilot carry on board the helicopter during an application flight?

  1. The helicopter's purchase invoice
  2. A written authorization from the landowner only
  3. A valid pilot licence with the appropriate medical certificate Correct answer.
  4. A copy of the operator's maintenance contract only

Explanation

Regulations require the pilot to carry a valid licence with the corresponding medical certificate in force whenever operating. Other commercial or contractual paperwork is not a substitute for these personal licensing documents, which establish the pilot's legal authority and medical fitness to fly.

Question 3Air Law, ANAC Regulations and Agricultural Aviation Rules

For agricultural application operations, the minimum altitude over populated or congested areas is generally set to protect people and property. Which principle applies?

  1. The pilot may descend below the minimum only when carrying a passenger
  2. The pilot must maintain a safe altitude that avoids hazard to persons and property on the surface Correct answer.
  3. The pilot may fly below rooftops if the helicopter is certified for low-level flight
  4. The pilot may descend to any altitude provided the spray is turned off

Explanation

The overarching rule is that the pilot must never operate at an altitude that creates a hazard to persons or property on the ground. Certification for low-level work or turning off application equipment does not remove this duty of care, and carrying passengers does not grant any altitude exception.

Question 4Air Law, ANAC Regulations and Agricultural Aviation Rules

Before beginning an aerial application flight, which pre-flight consideration is specifically required for agricultural operations?

  1. Filing an IFR flight plan regardless of weather
  2. Obtaining a new medical certificate for each flight
  3. Confirming the product to be applied and the conditions under which it may be safely used Correct answer.
  4. Replacing the helicopter's registration certificate

Explanation

Agricultural operations require the pilot to verify the product, its label instructions, and the environmental conditions under which application is legal and safe. A medical certificate is renewed periodically rather than per flight, IFR plans are not universally required, and the registration certificate is a standing document that is not replaced each flight.

Question 5Air Law, ANAC Regulations and Agricultural Aviation Rules

What is the role of the ANAC-issued agricultural aviation operator authorization?

  1. It authorizes the company to conduct agricultural aviation operations subject to regulatory requirements Correct answer.
  2. It replaces the pilot's personal licence for agricultural flights
  3. It permits the operator to ignore local municipal spraying restrictions
  4. It certifies the airworthiness of each helicopter automatically

Explanation

The operator authorization establishes the company's legal ability to perform agricultural aviation activities, provided it meets ongoing regulatory requirements. It does not replace individual pilot licensing, cannot override local restrictions, and is distinct from the aircraft's airworthiness certification.

Question 6Air Law, ANAC Regulations and Agricultural Aviation Rules

Which of the following best describes the medical fitness requirement for an agricultural pilot helicopter licence holder?

  1. The pilot only needs medical clearance once at initial licensing
  2. The pilot may self-declare fitness without any medical certificate
  3. The pilot must hold a valid medical certificate appropriate to the licence and keep it in force Correct answer.
  4. The pilot needs medical clearance only when flying above 3,000 feet

Explanation

A valid medical certificate appropriate to the licence must be maintained throughout the period of operation, not just at initial issue. Self-declaration is not a substitute, and medical fitness applies at all altitudes, including the low-level work typical of agricultural flights.

Question 7Air Law, ANAC Regulations and Agricultural Aviation Rules

Which record must an agricultural aviation operator typically retain regarding each application operation?

  1. The pilot's secondary school transcripts
  2. The helicopter's original delivery paperwork
  3. The fuel supplier's invoices only
  4. A record of the product applied, the area treated and the date of application Correct answer.

Explanation

Operators must keep application records documenting the product used, the treated area and the date, which support traceability and regulatory oversight. School records, delivery paperwork and fuel invoices do not fulfil the operational record-keeping obligation tied to chemical application.

Question 8Air Law, ANAC Regulations and Agricultural Aviation Rules

When must the pilot notify the appropriate authority of an accident involving an agricultural helicopter?

  1. Only after the insurance company has been informed
  2. Within 30 days of the accident
  3. As soon as practicable, without delay, following the accident Correct answer.
  4. Only if a third party files a complaint

Explanation

Accident notification must be made promptly, as soon as practicable, so that authorities can begin investigation and safety action. Waiting for insurers, a 30-day window, or a third-party complaint would defeat the purpose of immediate reporting.

Question 9Air Law, ANAC Regulations and Agricultural Aviation Rules

An agricultural pilot is asked to spray a field adjacent to a school that is in session. What is the most appropriate action?

  1. Proceed if the wind is below 20 knots
  2. Proceed but reduce the spray rate by half
  3. Postpone or relocate the application to avoid drift hazard to the school Correct answer.
  4. Proceed because the school is outside the field boundary

Explanation

The pilot must prevent drift onto sensitive areas such as occupied schools; postponing or adjusting the operation is the correct response. A wind threshold, reduced rate, or a boundary line does not remove the risk of drift reaching people, so proceeding in any form is inappropriate.

Question 10Air Law, ANAC Regulations and Agricultural Aviation Rules

Which condition generally prohibits aerial application of a pesticide?

  1. Wind or atmospheric conditions likely to cause the product to drift onto sensitive areas Correct answer.
  2. A temperature above 15 degrees Celsius
  3. Flight during the morning hours
  4. Operation from a private airstrip

Explanation

Application is prohibited when weather or atmospheric conditions would likely carry the product onto sensitive areas, because drift is the primary environmental and health risk. Warm temperatures, morning flights and private strips are not themselves prohibitions and may be perfectly acceptable.

Question 11Air Law, ANAC Regulations and Agricultural Aviation Rules

How does the regulation treat the mixing and loading of agricultural chemicals near water sources?

  1. Mixing near water is unrestricted for helicopter operations
  2. Mixing near water is allowed when using a closed system only
  3. Mixing and loading must be conducted so that chemicals cannot enter water sources Correct answer.
  4. Mixing near water is permitted if the pilot works quickly

Explanation

Regulations require that mixing and loading be carried out in a manner that prevents chemicals from contaminating water sources. Speed, closed systems alone, or helicopter-specific exemptions do not remove this environmental protection obligation.

Question 12Air Law, ANAC Regulations and Agricultural Aviation Rules

What does a restricted-category pesticide designation mean for an agricultural pilot?

  1. The product may be applied only under the conditions and by personnel specified in its authorization Correct answer.
  2. The product may be applied by any pilot without restriction
  3. The product may only be sold, not applied
  4. The product may be applied only at night

Explanation

Restricted products carry specific conditions on who may apply them and under what circumstances, as set out in their regulatory authorization. They are not freely usable by any pilot, are not sale-only, and are not limited to night operations.

Question 13Air Law, ANAC Regulations and Agricultural Aviation Rules

Which of the following is a required element of the pilot's pre-application site assessment?

  1. Verifying the helicopter's resale value
  2. Checking the pilot's annual leave balance
  3. Confirming the landowner's tax status
  4. Identifying sensitive areas, obstacles and emergency landing options near the field Correct answer.

Explanation

A proper site assessment identifies sensitive areas, obstacles such as power lines, and suitable emergency landing options before beginning the application. Tax status, resale value and leave balance are administrative or commercial matters with no bearing on flight safety or application legality.

Question 14Air Law, ANAC Regulations and Agricultural Aviation Rules

An agricultural helicopter pilot is operating near an aerodrome. What obligation applies regarding other traffic?

  1. The pilot must integrate with aerodrome traffic and comply with applicable airspace and communication procedures Correct answer.
  2. The pilot may ignore other traffic because agricultural flights have priority
  3. The pilot must land immediately upon entering the aerodrome vicinity
  4. The pilot may cross the runway without any coordination

Explanation

Agricultural flights near an aerodrome must integrate with existing traffic and follow the applicable airspace, communication and coordination procedures. There is no blanket priority for agricultural aircraft, no right to cross runways uncoordinated, and no requirement to land merely on entering the vicinity.

Question 15Air Law, ANAC Regulations and Agricultural Aviation Rules

What is the standard requirement regarding the pilot's rest and duty period before an agricultural application flight?

  1. The pilot may extend duty hours freely during peak season
  2. The pilot only needs rest before night flights
  3. The pilot may fly regardless of fatigue if the flight is short
  4. The pilot must be sufficiently rested and free from fatigue before operating Correct answer.

Explanation

Pilots must be adequately rested and not impaired by fatigue before operating, since fatigue degrades judgment and reaction time in demanding low-level work. Short flights, peak-season pressure and night-only rules do not override this fundamental fitness-for-duty requirement.

Question 16Air Law, ANAC Regulations and Agricultural Aviation Rules

Which statement correctly describes the validity of an agricultural pilot helicopter licence?

  1. It is valid only within the province where it was issued
  2. It is valid for life regardless of medical status
  3. It remains valid provided the holder maintains the required medical certificate and currency Correct answer.
  4. It expires automatically every 90 days

Explanation

The licence remains valid as long as the holder keeps the required medical certificate in force and maintains any required currency. It is not a lifetime privilege independent of medical status, does not expire on a 90-day cycle, and is not limited to a single province.

Question 17Air Law, ANAC Regulations and Agricultural Aviation Rules

An operator wishes to apply a product not previously used in the region. What must be verified before application?

  1. That the product has a distinctive color
  2. That the product was approved in another country
  3. That the product is authorized for the intended crop and application method Correct answer.
  4. That the product is the cheapest available option

Explanation

Before use, the operator must confirm that the product is authorized for the specific crop and application method, since authorization is use-specific. Cost, foreign approval or color are not valid bases for determining legal use in the local jurisdiction.

Question 18Air Law, ANAC Regulations and Agricultural Aviation Rules

How should an agricultural pilot respond if a required safety device on the helicopter is found inoperative before an application flight?

  1. Commence the flight if the device is not needed for the specific field
  2. Commence the flight if the application job is urgent
  3. Commence the flight but note the defect afterward
  4. Do not commence the flight until the discrepancy is corrected or deferred in accordance with approved procedures Correct answer.

Explanation

An inoperative required safety device must be resolved, or formally deferred only where approved procedures permit, before flight. Urgency, after-the-fact notation, or the nature of a particular field do not justify operating with an unresolved required equipment defect.

Question 19Air Law, ANAC Regulations and Agricultural Aviation Rules

Which of the following activities falls outside the scope of privileges granted by an agricultural pilot helicopter licence?

  1. Carrying fare-paying passengers on a scheduled air service Correct answer.
  2. Dispersing seeds over an agricultural area
  3. Applying fertilizer to a crop by helicopter
  4. Conducting pest control application over a plantation

Explanation

The agricultural licence authorizes specialized application work such as fertilizer, seed dispersal and pest control, but not scheduled commercial passenger carriage, which requires a commercial licence and an air operator certificate. The other listed activities are core agricultural tasks within the licence scope.

Question 20Air Law, ANAC Regulations and Agricultural Aviation Rules

What is the significance of the aircraft's airworthiness certificate for an agricultural helicopter operation?

  1. It certifies the pilot's competence
  2. It replaces the need for periodic maintenance
  3. It authorizes the pilot to fly in any airspace class
  4. It confirms the helicopter meets the required airworthiness standards for the intended operations Correct answer.

Explanation

The airworthiness certificate confirms the helicopter conforms to approved standards and is fit for operation within its limitations. It does not confer airspace privileges, substitute for maintenance, or certify pilot competence, each of which is governed by separate requirements.

Question 21Air Law, ANAC Regulations and Agricultural Aviation Rules

An agricultural pilot observes that weather conditions are changing rapidly and drift risk is increasing mid-operation. What is the correct course of action?

  1. Continue at a lower altitude to reduce drift
  2. Continue because the field is already partially treated
  3. Suspend the application until conditions again permit safe and compliant operation Correct answer.
  4. Continue but increase the spray rate to finish faster

Explanation

When conditions deteriorate such that drift risk rises, the pilot must suspend application until safe and compliant conditions return. Lowering altitude, increasing the rate, or completing a partially treated field all worsen or fail to address the drift hazard.

Question 22Air Law, ANAC Regulations and Agricultural Aviation Rules

An operator's helicopter is leased seasonally. Which statement best reflects the regulatory responsibility for maintaining the aircraft in airworthy condition?

  1. Responsibility shifts to the pilot because the pilot flies the aircraft
  2. Maintenance responsibility can be waived by written agreement with the landowner
  3. The lessor alone bears all responsibility once the lease is signed
  4. The operator remains responsible for ensuring required maintenance is performed and recorded regardless of lease arrangements Correct answer.

Explanation

The operating entity remains accountable for ensuring required maintenance is accomplished and properly recorded, even when the aircraft is leased. Lease arrangements do not transfer this regulatory duty to the lessor alone, to the pilot personally, or to third parties such as landowners.

Question 23Air Law, ANAC Regulations and Agricultural Aviation Rules

A landowner asks the pilot to apply a product at a rate above the label maximum to improve results. How should the pilot respond?

  1. Decline, because application must follow the authorized label rate and conditions Correct answer.
  2. Comply if the pilot reduces the treated area
  3. Comply if the pilot records the higher rate afterward
  4. Comply, because the landowner owns the crop

Explanation

Application must conform to the authorized label rate and conditions; a landowner's request cannot authorize an off-label rate. Ownership of the crop, reducing the area, or recording the deviation afterward does not make an unauthorized application lawful.

Question 24Air Law, ANAC Regulations and Agricultural Aviation Rules

Two operators share a staging area near a sensitive watercourse. Which practice best satisfies environmental protection obligations during loading?

  1. Load only when the wind blows toward the watercourse
  2. Load directly beside the watercourse to shorten taxi distance
  3. Load on any flat surface and rinse equipment into the watercourse afterward
  4. Establish a dedicated loading zone away from the watercourse with containment for spills Correct answer.

Explanation

Loading should occur in a designated area situated away from watercourses and equipped with containment to capture spills and rinsate. Loading beside the water, rinsing into it, or relying on wind direction all create a direct contamination pathway and violate environmental protection requirements.

Question 25Air Law, ANAC Regulations and Agricultural Aviation Rules

An agricultural pilot is asked to operate a helicopter type for which the pilot holds no type-specific training or endorsement. What is the regulatory position?

  1. The pilot may not act as pilot in command until the required type-specific training and endorsement are completed Correct answer.
  2. The pilot may operate if the operator accepts the risk in writing
  3. The pilot may operate if a more experienced pilot is present on the ground
  4. The pilot may operate if the flight lasts less than one hour

Explanation

Acting as pilot in command of a type requires the appropriate type-specific training and endorsement; ground presence, short duration, or a written risk acceptance cannot substitute. These conditions do not establish the competence and authorization the regulation demands.

Question 26Air Law, ANAC Regulations and Agricultural Aviation Rules

Under the general framework of civil aviation regulations applied to agricultural helicopter operations, which document must be carried on board the aircraft during an application flight?

  1. The certificate of registration and the certificate of airworthiness Correct answer.
  2. The operator's pesticide purchase invoices for the current season
  3. The pilot's personal logbook covering the last twelve months
  4. The landowner's written consent for each treated field

Explanation

Aircraft documents that establish nationality, registration and airworthiness must be on board during flight, together with the licence of the pilot and, where applicable, the operator certificate. Commercial invoices and private land consents are administrative records kept on the ground, not flight documents. The pilot logbook is retained by the pilot and is not required to be carried in the helicopter.

Question 27Air Law, ANAC Regulations and Agricultural Aviation Rules

An agricultural helicopter operator wants to begin operations with a newly hired pilot. Which action best reflects the regulatory responsibility of the operator before the pilot flies application missions?

  1. Allow the pilot to start work and complete paperwork at the end of the season
  2. Rely on the pilot's own statement that previous employers checked the records
  3. Confirm the pilot holds the correct licence, ratings and current competency checks for the type Correct answer.
  4. Delegate the verification entirely to the chemical supplier

Explanation

The operator is responsible for ensuring that each pilot is properly licensed, holds the required ratings and endorsements for the helicopter type, and has valid competency and medical checks before flying. This verification is a management duty that cannot be transferred to the pilot alone or to a third party. Deferring the checks until after operations exposes the operator and the pilot to enforcement action.

Question 28Air Law, ANAC Regulations and Agricultural Aviation Rules

During a spray run, an agricultural helicopter pilot loses radio contact with the ground crew but the aircraft and conditions remain normal. What is the most appropriate course of action?

  1. Continue only under a pre-briefed lost-communication procedure and stop application if safe coordination cannot be assured Correct answer.
  2. Increase speed and complete all remaining passes without ground signals
  3. Abandon the helicopter in flight by autorotating into the treated field
  4. Immediately jettison the load over the nearest populated area

Explanation

Operations next to ground personnel and sensitive areas depend on reliable coordination, so a lost-communication procedure should be briefed before flight and followed when contact fails. If the pilot cannot be sure that the ground crew and bystanders are clear of the flight path or drift zone, the application must be suspended until communication is restored. Continuing blindly or dumping chemical near people creates unacceptable risk.

Question 29Air Law, ANAC Regulations and Agricultural Aviation Rules

A pesticide label specifies a maximum application rate and a mandatory buffer distance from a watercourse. The landowner asks the pilot to reduce the buffer to cover more area. How should the pilot proceed?

  1. Apply above the label rate to compensate for the smaller treated area
  2. Refuse to spray the field at all and leave without explanation
  3. Apply at the label rate but shorten the buffer as a favour to the landowner
  4. Apply strictly within the label rate and buffer, and decline the request to narrow the buffer Correct answer.

Explanation

Label directions are legally binding conditions of use, so the maximum rate and any buffer distance must be respected regardless of the landowner's preference. The pilot should explain the constraint and, if necessary, adjust the flight pattern or decline the affected portion of the field. Refusing the whole job without discussion is unnecessary when a compliant plan is possible.

Question 30Air Law, ANAC Regulations and Agricultural Aviation Rules

An agricultural aviation business operates two helicopters from a temporary staging site on a private farm for several weeks. Which statement best describes how the regulatory framework treats this temporary base?

  1. It requires the pilot to register a new operating certificate for the site
  2. It is exempt from oversight because it is not a licensed aerodrome
  3. It remains subject to the operator's certificate and safety management obligations, including site hazard assessment and record keeping Correct answer.
  4. It is governed only by the landowner's private rules and local custom

Explanation

A temporary operating base does not create a regulatory gap: the operator's certificate, safety management system and record-keeping duties follow the operation wherever it is conducted. The operator must assess site-specific hazards such as power lines, neighbouring sensitive areas and emergency access before use. Being on private land or away from a licensed aerodrome does not remove that oversight.

Question 31Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

In a helicopter, what is the primary function of the swashplate assembly?

  1. It provides the drive path from the main gearbox to the tail rotor
  2. It damps lead-lag motion of the rotor blades
  3. It regulates the engine fuel flow according to collective position
  4. It transfers pilot control inputs from the non-rotating controls to the rotating blade grips Correct answer.

Explanation

The swashplate has a non-rotating lower ring moved by the cyclic and collective, and a rotating upper ring turning with the mast. Because the upper ring rotates with the rotor, it can pass blade pitch changes to each blade grip through pitch links. This is how cyclic tilt and collective rise are transmitted into the rotating system.

Question 32Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

What is the purpose of the freewheel unit (sprag clutch) between the engine and the main gearbox?

  1. It allows the rotor to keep turning after engine power is lost while preventing the rotor from driving the engine Correct answer.
  2. It disconnects the tail rotor drive during autorotation
  3. It synchronises two engines so they share load equally
  4. It limits maximum engine torque during aggressive manoeuvres

Explanation

The freewheel unit transmits torque in one direction only, from engine to gearbox. If engine power falls below rotor speed, the unit overruns, so the rotor can continue rotating and the engine is not driven by the rotor. This overrunning capability is essential for autorotation and for single-engine operation in multi-engine helicopters.

Question 33Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

Why do helicopter tail rotor blades often use a symmetrical aerofoil section?

  1. They must produce thrust in either direction as pedal inputs change blade pitch through zero Correct answer.
  2. They must avoid flutter at high coning angles
  3. They are designed to reduce centrifugal loads at the hub
  4. They need high lift at low angles of attack only

Explanation

Tail rotor pitch is varied by the pilot through a range that includes positive and negative angles, so thrust can be produced to either side for yaw control. A symmetrical section gives predictable lift in both directions with the same magnitude for equal pitch. A cambered section would produce unequal thrust for equal positive and negative pitch.

Question 34Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

During an autorotative descent, which statement best describes the airflow through the main rotor?

  1. Air flows downward through the disc exactly as in powered flight
  2. Air flows upward through the rotor disc, driving the blades and sustaining rotation Correct answer.
  3. Airflow reverses only in the retreating blade region
  4. Air flows horizontally across the disc with no vertical component

Explanation

In autorotation the engine is disengaged and the rotor is driven by air passing upward through the disc. The induced flow plus the descent rate produces an upward relative airflow that sustains blade rotation. The rotor extracts energy from the airflow to overcome drag and keep turning.

Question 35Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

What is the main reason helicopter main rotor blades are often attached with elastomeric bearings or flexible elements instead of conventional hinges?

  1. To allow the blades to be folded automatically in flight
  2. To increase blade mass so that coning is reduced
  3. To accommodate flapping, lead-lag and pitch changes with fewer mechanical parts and less maintenance Correct answer.
  4. To eliminate the need for a swashplate

Explanation

Elastomeric bearings deform elastically to permit flapping, lead-lag and feathering motions without lubricated metal hinges. This reduces part count, eliminates grease points and lowers maintenance burden. The bearings still allow the necessary blade motions, so control and dynamics are preserved.

Question 36Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

A pilot notices that the main rotor RPM decays slowly while the engine torque indication remains normal in cruise. Which component should be suspected first?

  1. The tail rotor pitch change mechanism
  2. The cyclic trim actuator
  3. The engine air intake filter
  4. The freewheel unit slipping or the main gearbox drive train Correct answer.

Explanation

If engine torque remains normal but rotor RPM falls, the drive path between engine and rotor is not transmitting torque correctly. A slipping freewheel unit or a fault in the main gearbox drive train would allow the engine to run while the rotor slows. Tail rotor or trim faults would not normally cause a slow rotor RPM decay with normal torque.

Question 37Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

What is the function of the collective pitch control?

  1. It sets the engine throttle directly through a mechanical linkage only
  2. It controls the tail rotor pitch for yaw
  3. It changes the pitch of all main rotor blades equally to control total rotor thrust Correct answer.
  4. It changes blade pitch cyclically to tilt the rotor disc

Explanation

The collective raises or lowers the pitch of all blades simultaneously and equally. This changes the total lift produced by the rotor, allowing climbs, descents and hovering. The cyclic, in contrast, varies pitch around the disc to tilt thrust.

Question 38Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

Why is a centrifugal droop stop fitted to some main rotor heads?

  1. To limit upward coning at high rotor RPM
  2. To lock the blades for storage only
  3. To limit downward blade flapping when rotor RPM is low, such as during start-up or shutdown Correct answer.
  4. To damp lead-lag oscillations in cruise

Explanation

At low rotor RPM, centrifugal force is insufficient to hold the blades out and up, so blades could droop and strike the tail boom or fuselage. Droop stops limit downward flapping until RPM rises enough for centrifugal stiffening. They protect the structure during start-up, shutdown and parked conditions.

Question 39Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

What does the term 'mast bumping' describe?

  1. Vibration caused by an out-of-balance tail rotor
  2. Contact between the rotor hub and the mast caused by excessive flapping with low blade stiffness Correct answer.
  3. Oscillation of the engine on its mounts
  4. Contact between the tail rotor and the tail boom

Explanation

Mast bumping occurs when the rotor hub flapping angle becomes so large that the hub contacts the mast. It is associated with teetering or articulated heads under low-G or low-thrust conditions. The contact can cause severe structural damage and loss of rotor control.

Question 40Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

How does a hydraulically boosted flight control system on a helicopter typically fail-safe?

  1. It locks the controls in the last commanded position
  2. It automatically engages the autopilot
  3. It shuts down the engine to reduce control loads
  4. It reverts to direct mechanical control with higher stick forces Correct answer.

Explanation

Hydraulic boost reduces pilot effort, but the mechanical linkage remains so that control can continue if hydraulic pressure is lost. The pilot then flies with unboosted forces, which are higher but manageable. This design provides a safe degradation path rather than a total loss of control.

Question 41Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

What is the main purpose of the tail rotor in a single main rotor helicopter?

  1. To drive the main rotor during autorotation
  2. To cool the main gearbox oil
  3. To counteract main rotor torque and provide yaw control Correct answer.
  4. To provide additional lift in forward flight

Explanation

The main rotor turning one way produces an equal and opposite torque reaction on the fuselage. The tail rotor produces sideways thrust to oppose this torque and to give the pilot directional control. Without it, the fuselage would rotate in the opposite direction to the rotor.

Question 42Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

In a helicopter with a conventional tail rotor, what happens to the power required by the tail rotor as forward speed increases?

  1. It remains exactly constant at all speeds
  2. It generally decreases because the main rotor wake increasingly shields the tail rotor and translational lift reduces torque Correct answer.
  3. It increases steadily because the tail rotor must overcome greater fuselage drag
  4. It becomes zero above translational lift speed

Explanation

As forward speed rises, the main rotor torque reaction decreases and the tail rotor becomes partly immersed in the main rotor wake and in undisturbed airflow. These effects reduce the tail rotor thrust required for a given yaw balance. The result is a general reduction in tail rotor power demand at higher speeds.

Question 43Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

What is the function of the engine-to-gearbox coupling shaft in a helicopter?

  1. It transmits engine torque to the main gearbox input Correct answer.
  2. It drives the oil pump for the main gearbox
  3. It carries the tail rotor drive shaft
  4. It supports the main rotor mast bearings

Explanation

The coupling shaft connects the engine output to the main gearbox input, often through a freewheel unit. It must tolerate small misalignments and transmit high torque. Its failure would interrupt the drive from engine to rotor.

Question 44Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

Why must the main rotor blades be tracked and balanced?

  1. To increase the maximum rotor RPM
  2. To set the engine idle speed
  3. To reduce vibration and ensure the blades follow the same path, improving comfort and reducing structural loads Correct answer.
  4. To adjust the tail rotor thrust

Explanation

Blade tracking ensures all blades follow the same tip path, while balancing reduces out-of-balance forces. Poor tracking or balance causes vibration that increases fatigue loads and degrades handling and comfort. Correct adjustment restores smooth operation and prolongs component life.

Question 45Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

What is the main advantage of a fenestron (shrouded tail rotor) compared with a conventional tail rotor?

  1. It allows the tail rotor to produce lift
  2. The shroud protects the rotor in confined areas and reduces noise Correct answer.
  3. It eliminates the need for any anti-torque device
  4. It removes the need for a tail rotor drive shaft

Explanation

A fenestron encloses the tail rotor in a duct, which shields the blades from ground contact and foreign objects. The duct also modifies the noise pattern and can reduce noise levels. It does not remove the need for anti-torque thrust or for a drive shaft.

Question 46Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

A helicopter is hovering and the pilot increases collective pitch without adding throttle. What is the most likely immediate effect?

  1. Tail rotor thrust decreases automatically
  2. Engine torque decreases
  3. Rotor RPM tends to decrease because more power is required Correct answer.
  4. Rotor RPM tends to increase because lift is greater

Explanation

Increasing collective pitch increases blade angle of attack and therefore rotor drag and power required. If throttle or fuel flow is not increased, the engine cannot supply the extra power, so rotor RPM tends to droop. This is why collective and throttle are coordinated, often through a correlator or governor.

Question 47Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

What is the purpose of a rotor brake on a helicopter?

  1. To stop and hold the main rotor after engine shutdown Correct answer.
  2. To slow the helicopter during a quick stop
  3. To brake the tail rotor during autorotation
  4. To limit rotor overspeed in flight

Explanation

A rotor brake is used on the ground to slow and hold the main rotor after shutdown, particularly in windy conditions. It prevents the rotor from windmilling and reduces the risk of blade damage. It is not a flight control and is not used to slow the aircraft in flight.

Question 48Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

Which statement correctly describes the load path of the main rotor thrust in a helicopter?

  1. Thrust passes from the blades through the hub and mast into the main gearbox and airframe Correct answer.
  2. Thrust is carried only by the engine mounts
  3. Thrust is transferred to the airframe through the tail rotor drive shaft
  4. Thrust passes from the blades directly into the tail boom

Explanation

Main rotor lift is generated at the blades and carried through the blade grips and hub to the mast. The mast transmits the load into the main gearbox structure and then into the airframe. Engine mounts and the tail drive shaft are not primary load paths for rotor thrust.

Question 49Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

What does a 'governor' do in a helicopter powerplant installation?

  1. It regulates hydraulic system pressure
  2. It controls the tail rotor pitch
  3. It limits the maximum altitude of the helicopter
  4. It automatically adjusts engine power to maintain a selected rotor RPM Correct answer.

Explanation

The governor senses rotor or engine RPM and adjusts fuel flow or throttle to hold the selected RPM. This frees the pilot from constant manual throttle correction as collective changes. It acts on engine power, not on tail rotor pitch or hydraulic pressure.

Question 50Aircraft General Knowledge: Helicopter Structure, Powerplant and Systems

Why is a twin-engine helicopter's combining gearbox necessary?

  1. It merges the torque from both engines into a single drive to the main rotor Correct answer.
  2. It cools the engine oil before it returns to the engines
  3. It provides the freewheel function for only one engine
  4. It reduces the rotor RPM to the tail rotor speed

Explanation

In a multi-engine helicopter each engine drives its own input, and the combining gearbox sums their torques into one output to the main rotor. This allows either engine to drive the rotor if the other fails. It also provides the mechanical interface for load sharing.