ANAC Agricultural Pilot Airplane (PAGA) cheat sheet

In Brazil, agricultural aviation is governed by RBAC 137 (agricultural aircraft operations) plus RBAC 61 (licences and ratings); the PAGA (Piloto Agrícola) is the specific licence endorsement for aerial application.

Three core documents must be valid before any application flight: the pilot's PAGA licence/medical certificate, the aircraft's airworthiness certificate (CAV), and the operator's authorization or registration with ANAC as an agricultural aviation operator.

RBAC 137 requires the operator to hold an operations manual (MGO/manual de operações) approved or accepted by ANAC, defining aircraft, equipment, application limits and pilot responsibilities.

Application of agrochemicals is regulated jointly: ANAC (flight safety), MAPA (product registration and agronomic prescription), and state environmental/health agencies (IBAMA for environmental licensing, ANVISA for toxicology).

A valid agronomic prescription (receituário agronômico) issued by a licensed agronomist is legally required before applying any pesticide; the pilot must carry or have access to it.

Logbooks and application records must be retained: flight hours, product used, dose, area treated, weather at time of application, and pilot/aircraft identification; retention periods follow RBAC 137 and MAPA rules.

The PAGA licence requires specific theoretical and practical training, including agricultural toxicology, application techniques and low-level flight; recurrent training and proficiency checks are mandatory to maintain currency.

Any accident or incident involving agricultural aircraft, including product spill or drift complaint, must be reported to ANAC (and CENIPA for accidents) within the timelines set by regulation.

Agricultural aircraft are certified in the restricted/agricultural category with a defined maximum takeoff weight (MTOW) and a maximum hopper load; exceeding either invalidates the certification basis and the flight.

The spray system comprises hopper, agitator, pump, filters, pressure regulator, boom, nozzles and shutoff valve; each component must be inspected before flight for leaks, blockage and correct calibration.

Nozzle type and orifice size determine flow rate and droplet spectrum: flat-fan and hollow-cone nozzles produce different VMD (volume median diameter), which directly affects drift and coverage.

Flow rate formula: L/min = (L/ha × swath width in m × speed in m/s) / 600, or in aviation units L/min = (L/ha × swath in m × speed in km/h) / 60000 × 1000; verify against pump pressure and nozzle chart.

Engine and propeller on ag aircraft operate in severe dust and chemical environments; air filters, compressor wash and propeller blade erosion inspection are required at intervals shorter than for general aviation.

Hopper agitation must keep suspension products in suspension; settling causes dose stratification, nozzle blockage and under-application at the start of a swath.

Corrosion control is critical: fertilizer (urea) and many pesticides are highly corrosive to aluminium structures; post-flight washing and inspection of the hopper, boom and belly are mandatory maintenance tasks.

Pre-flight inspection of the spray system includes: valve function test, nozzle pattern check on the ground, pressure gauge accuracy, and confirmation that the emergency dump/jettison system works.

Weight and balance: total weight = empty weight + pilot + fuel + hopper load; the hopper is located near the CG, so load variation changes weight more than balance, but boom/equipment additions must be reflected in the current weight and balance record.

Takeoff distance increases with density altitude; rule of thumb: density altitude rises about 120 ft per 1 °C above ISA at a given pressure altitude, reducing engine power and lift.

Use the aircraft's POH charts for takeoff/landing distance, and apply the 50 ft obstacle clearance factor; agricultural strips are often short, unpaved and surrounded by obstacles.

Landing on soft or unpaved strips increases rolling friction; soft-field technique (keep weight off the nosewheel, minimum braking) is standard for ag strips.

Stall speed increases with weight by the square root of the load factor; a hopper full at low level leaves little margin, so approach and application speeds must respect the published V speeds for the actual weight.

The hopper load must be reduced when density altitude, strip length, obstacles or wind limit performance; the pilot computes the maximum safe load before each departure, not a fixed default.

After application, the aircraft lands lighter; the risk shifts to a forward CG or a tendency to float, so landing speed and flare must be adjusted for the reduced weight.

Crosswind and tailwind limits apply to agricultural strips; a tailwind of 10 kt can increase landing distance by roughly 20 percent, and obstacle clearance margins must account for it.

Fatigue is the dominant human-factors risk in agricultural aviation: long seasonal days, early starts and repeated short flights degrade vigilance; duty and rest limits must be respected and logged.

Spatial disorientation risk increases during low-level turns, spray runs over featureless fields and in hazy conditions; the pilot must rely on instruments and a defined reference line, not on sensation.

The 'get-there' and 'get-the-field-done' pressures (commercial pressure) drive continued flight into worsening weather or into an unplanned load; a pre-briefed personal minimums checklist counters this.

Single-pilot workload during application is high (flying, monitoring spray pressure, watching obstacles); task prioritization rule: aviate, navigate, then manage the spray system.

Checklist discipline and standardized callouts replace the second crew member; verbalizing 'hopper empty, valve closed, turning' builds a self-check habit.

Self-medication and alcohol: many agrochemicals and common medications impair performance; the pilot must apply the same rules as for any commercial flight, and chemical exposure symptoms must be treated as a no-go condition.

Post-accident analysis of ag operations repeatedly cites wire strikes and loss of control in the turn at the end of the swath; briefing the turn direction and the obstacle map before takeoff is a CRM equivalent for single pilots.

Situational awareness is maintained by a continuous scan cycle: field boundary, obstacles, altitude, airspeed, spray pressure and wind drift indicator, in a fixed order.

Temperature inversion (stable air, usually early morning or night) traps droplets and reduces vertical mixing; spraying under an inversion produces concentrated drift downwind, so application is avoided until the inversion breaks.

Delta T (temperature minus dew point) is a standard drift indicator: a small delta T means high relative humidity and slower evaporation but greater risk of fine droplets persisting; a large delta T means rapid evaporation and possible drift of fine droplets.

Wind speed limits for aerial application are typically 3-10 km/h minimum (to aid dispersion) and a maximum around 10-15 km/h depending on product label and local rules; never apply in gusty or shifting wind.

Relative humidity below about 50-60 percent increases evaporation of fine droplets, reducing deposition on target and increasing off-target movement; coarse droplet spectrum is used in these conditions.

Turbulence and thermals in the afternoon cause uneven deposition and dangerous low-level handling; early morning and late afternoon windows are preferred for both safety and efficacy.

Thunderstorm and gust-front avoidance: downdrafts and wind shear are lethal at application altitude, and outflow boundaries can shift wind direction 180 degrees within minutes.

Visibility and haze affect obstacle detection during low-level runs; the pilot establishes a minimum flight visibility and a go/no-go decision before departure.

Rainfastness: rainfall after application can wash the product off the leaf; the label defines the rain-free interval, and the pilot/agronomist must check the forecast before spraying.

The application pattern is planned on the ground: swath width, number of runs, turn direction, refill/loading point and entry/exit headings are decided before takeoff to keep the aircraft over the field.

Swath width depends on nozzle spacing, boom height, droplet size and wind; it is determined by calibration, not assumed, and the number of runs = field width / effective swath width.

GPS with lightbar or autopilot guidance reduces overlaps and skips; the pilot must still maintain visual obstacle avoidance and not fixate on the guidance screen.

The loading/refill site must be planned for wind direction, distance from watercourses and dwellings, and safe approach/departure paths; it becomes the navigation hub for the mission.

Fuel planning accounts for the ferry, the application runs, the reserve and the go-around/refill cycle; ag aircraft have limited endurance with a full hopper, so fuel and load planning are linked.

Obstacle survey: power lines, towers, trees, fences and irrigation pivots are plotted on a field map with heights and distances; the map is briefed before the first run.

Ferry flight planning respects the aircraft's restricted category limitations and any populated-area overflight restrictions; agricultural aircraft should avoid congested areas.

Boundary and buffer zones (watercourses, houses, roads, apiaries, sensitive crops) are marked as no-spray areas and are part of the navigation plan, not an in-flight decision.

Application height is set by the label and the crop: typically 2-4 m above the canopy for field crops, higher for orchards and for coarse droplets; the boom must be level and at the correct height above the target.

The standard swath pattern is the back-and-forth (racetrack) with 180-degree turns; the turn is made after the spray valve is closed and with a climb, never while spraying at low altitude.

Wire strikes are the leading fatal hazard: never fly under a wire, cross wires only at a surveyed crossing point with a known clearance, and mark all lines on the field map.

Spray valve discipline: open at the field boundary after the aircraft is aligned and at application height; close before the boundary, before any turn and before any climb.

Drift management uses the droplet spectrum, boom height, wind and buffer zones; the coarsest practical droplet size is selected when wind or humidity increases.

Emergency dump/jettison is used to reduce weight in an engine failure or forced landing; dump only in a safe area and follow the aircraft's procedure, since dumping over people or water is prohibited.

Low-level maneuvering limits: bank angles and pull-ups at application altitude must stay within the aircraft's published envelope; a 60-degree bank increases stall speed by about 40 percent.

Post-application procedure: close the valve, record the treated area and product, wash the system at the designated site, and log the flight; contamination of the next load must be prevented.

Engine failure at application altitude: immediately establish best glide speed, select a forced-landing field ahead (not behind), dump the hopper if the procedure calls for it, and transmit MAYDAY with position.

Hopper load emergency: a full hopper increases stall speed and reduces climb; in a forced landing the dump valve is used to reduce impact energy, but dumping over people, dwellings or water is avoided.

Spray system failure: pump failure, burst hose or stuck valve is handled by closing the master spray valve, reducing power, and returning to land; chemical contamination of the cockpit requires ventilation and landing as soon as possible.

Fire: agricultural aircraft carry flammable fuel near hot engine sections; the procedure is fuel shutoff, electrical master off, forced landing, and evacuation upwind of the fire.

Loss of control in the turn: the recovery is power reduction, wings level, and gentle pull-up; the low-altitude turn is the most common LOC accident scenario, so the go-around decision must be made early.

Wire strike aftermath: if a wire is hit, maintain control, avoid abrupt pull-up into a second wire, and land as soon as practicable; structural damage may not be immediately visible.

Chemical spill on the ground: stop the engine, contain the spill with absorbent material, keep people upwind, and notify the authorities; the pilot's emergency kit includes PPE and spill materials.

Emergency briefing before each flight covers: forced-landing fields, wire locations, wind, refill site, and the dump procedure; it is a mental rehearsal, not a paperwork item.

Toxicology basics: LD50 (oral dermal) and WHO hazard class define the product's toxicity; the label's signal word and colour band (green, blue, yellow, red) communicate the hazard to the pilot and ground crew.

Exposure routes are inhalation, dermal and oral; PPE for mixing and loading is more demanding than for the cockpit, and the pilot must wear the PPE specified on the label.

Cholinesterase-inhibiting insecticides (organophosphates and carbamates) cause a characteristic syndrome: miosis, salivation, sweating, bradycardia and weakness; any such symptom after exposure means immediate removal from duty and medical care.

Drift and volatilization are environmental risks: buffer zones protect watercourses, apiaries, dwellings and sensitive crops, and the label's buffer distances are mandatory.

Container and washwater management: triple rinsing, no rinsate discharge to watercourses, and return of empty containers to the licensed collection point are legal requirements.

Product storage and transport follow MAPA and ANVISA rules; the aircraft and loading site must carry the required safety signage and spill containment.

The agronomic prescription defines the product, dose, area and application conditions; the pilot may refuse an application that violates the label or the prescription.

Record keeping supports traceability: product, batch, dose, date, time, weather, area and pilot are recorded and retained; these records are the operator's legal defence and the basis for residue compliance.