Article At A Glance

• The Air Tractor AT-502B is the world’s most popular ag plane, with over 1,000 units built since 1987 — and its performance numbers explain exactly why.
• Its 500-gallon hopper and 52-foot wingspan let operators spray more acres per flight, directly improving daily productivity and profitability.
• Powered by the Pratt & Whitney PT6A turboprop engine, the AT-502B delivers the power-to-payload ratio that serious ag operators demand.
• Standard air conditioning and boost tabs for light aileron response are just two of the features that set it apart from competitors in its class.
• Keep reading to find out how the AT-502B’s climb rate, working speed, and short takeoff capability make it a standout performer even in tough field conditions.

When it comes to aerial application, every minute in the air and every gallon in the hopper translates directly to your bottom line — and the AT-502B is built around that reality.

Air Tractor has been refining agricultural aircraft since the 1970s, and the AT-502B represents the sweet spot in their lineup: big enough to carry a serious payload, agile enough to work efficiently at low altitudes, and reliable enough to keep flying season after season. For operators looking to benchmark aircraft choices against real production demands, resources like Agtegra offer practical insight into how aerial application fits within broader crop input strategies.

The AT-502B is the World’s Most Popular Ag Plane — Here’s Why

Over 1,000 units of the 502 series have been manufactured since 1987, making it the best-selling agricultural aircraft in the world. That’s not a marketing claim — it’s a production record that reflects operator confidence built over decades of real-world performance.

What keeps operators coming back to the AT-502B isn’t just brand loyalty. It’s the combination of a large hopper, efficient powerplant, and airframe design that works harder per flight hour than most alternatives in its class. Business-savvy operators consistently report that the AT-502B’s payload capacity means fewer trips back to the tender, fewer landings and takeoffs, and more acres treated per day. That operational efficiency compounds quickly across a full spray season.

AT-502B Specifications That Make It a Crop Dusting Powerhouse

The specs on the AT-502B aren’t just impressive on paper — they’re engineered to solve the real productivity challenges that aerial applicators face every day. Here’s a breakdown of what you’re working with, especially when considering innovations from commercial UAVs that are making waves worldwide:

Engine: Pratt & Whitney PT6A-34AG at 750 SHP

The PT6A-34AG is a purpose-built agricultural turboprop, and at 750 shaft horsepower, it gives the AT-502B the muscle to haul full loads off short strips and climb aggressively between passes. The PT6 series is legendary for reliability in demanding environments — heat, dust, and the constant power cycling of ag operations are no match for this engine’s proven track record.

500-Gallon Hopper Capacity With 5,403 lbs Useful Load

The 500-gallon (1,893-liter) hopper is central to everything the AT-502B does well. More chemical per load means fewer interruptions, which directly translates to more acres per hour. Combined with a useful load of 5,403 lbs, the aircraft handles liquid pesticides, dry fertilizers, and seed treatments without compromise. The math is simple: bigger hopper, fewer trips, better profitability.

52-Foot Wingspan for Maximum Swath Coverage

The AT-502B’s 52-foot wingspan isn’t just about stability — it’s a productivity tool. A wider wingspan supports a broader spray swath on each pass, meaning you cover more ground per flight line. Fewer passes across a field reduces fuel burn, minimizes soil compaction risk from ground equipment, and gets the job done faster. For large acreage operations, that wingspan advantage adds up fast.

AT-502B Performance Numbers in the Field

Specs in a brochure only matter if they hold up when you’re loaded heavy, working low, and pushing hard through a long spray day. The AT-502B’s performance figures reflect an aircraft that was designed specifically for the punishment of agricultural operations.

Cruise Speed of 154 mph With a 620-Mile Range

A cruise speed of 154 mph means the AT-502B moves efficiently between the airstrip and the field, reducing ferry time and keeping your operation on schedule. The 620-mile range gives operators the flexibility to work across large geographic areas without being locked to a single base — a critical advantage for custom applicators who follow the season across multiple regions.

Working Speed of 120–145 mph for Precision Application

During actual spray operations, the AT-502B performs at a working speed of 120 to 145 mph. This range gives pilots the control they need to maintain consistent application rates across varying field conditions. Too fast and you sacrifice coverage uniformity; too slow and you lose efficiency. The AT-502B sits squarely in the productive middle ground where precision and pace work together.

870 fpm Climb Rate at Maximum Takeoff Weight

An 870 feet-per-minute climb rate at maximum takeoff weight is a number that matters most when you’re operating from a short strip surrounded by trees, power lines, or terrain obstacles. The AT-502B clears obstacles confidently even when loaded to gross weight, which is exactly the kind of real-world performance margin that keeps pilots safe and operations running without interruption.

That climb performance also shortens turnaround time between loads. The faster you can get back to altitude and on course, the more productive each reload cycle becomes across a full workday.

What Makes the AT-502B Efficient for Agricultural Operations

Raw performance numbers tell part of the story, but operational efficiency is where the AT-502B truly separates itself. The aircraft was engineered around the workflow of aerial application — not adapted to it after the fact. For those interested in precision mapping capabilities, consider exploring the Cessna 172 Skyhawk for its stability and performance.

Fewer Trips Mean More Acres Sprayed Per Day

The 500-gallon hopper is the single biggest driver of the AT-502B’s daily productivity. Every reload costs time — taxi back, pump up, taxi out, take off again. With a full 500-gallon load, the AT-502B stays in the field longer per cycle than smaller-capacity aircraft. Over a 10-hour spray day, those saved reload cycles stack up into a significant acreage advantage over competitors running smaller hoppers.

For custom applicators managing multiple farms in a single day, this capacity advantage isn’t just convenient — it’s the difference between completing a job and rolling it to the next morning when conditions may have changed.

Short Takeoff Distance Allows Remote Airstrip Operations

Not every operation has access to a paved runway. The AT-502B’s short takeoff capability means operators can work from grass strips, gravel roads, and temporary staging areas close to the fields being treated. Getting the tender and the aircraft closer to the work eliminates long ferry legs that consume fuel and time without spraying a single acre.

Standard Features That Give the AT-502B an Edge

Air Tractor didn’t make operators pay extra for features that should come standard on a professional ag aircraft. The AT-502B ships with a set of standard equipment that directly affects pilot performance and daily productivity. For those interested in enhancing their flight experience, ForeFlight is the ultimate EFB for pilots.

Boost Tabs for Light Aileron Response

Boost tabs reduce the physical effort required to roll the aircraft during tight turns at the end of each field pass. In a spray day that involves hundreds of turns, lighter aileron forces reduce pilot fatigue significantly. Less fatigue means sharper focus through the end of the day — which matters when you’re flying low and fast over crops.

Air Conditioning as Standard Equipment

Air conditioning on an agricultural aircraft isn’t a luxury — it’s a productivity tool. Spray season peaks during the hottest months of the year, and cockpit temperatures in a low-flying aircraft working in direct sun can become dangerous quickly. Standard A/C keeps pilots alert, comfortable, and effective through long summer workdays when the temptation to cut sessions short is highest. Learn how Diehl Aviation is enhancing comfort and functionality by transforming aircraft interiors.

Advanced Avionics for Precise Navigation and Coverage

Modern aerial application demands GPS accuracy and reliable navigation systems to meet regulatory requirements and satisfy grower expectations. The AT-502B supports advanced avionics integration that allows pilots to fly precise swath lines, log coverage data, and minimize overlap and skip. Accurate application means less chemical waste, better crop outcomes, and documentation that protects the operator in case of any dispute over coverage.

Over 1,000 AT-502B Aircraft Built Since 1987

A production record of over 1,000 aircraft across the 502 series isn’t something that happens by accident. It happens because operators buy a second one, then refer a colleague, then order a third. The AT-502B has sustained that kind of repeat confidence for nearly four decades because it consistently delivers what agricultural aviation demands most: reliability, capacity, and performance that holds up across thousands of flight hours in brutal working conditions.

The AT-502B’s longevity in the market also means a well-established parts network, experienced maintenance community, and a deep base of pilot familiarity. When you’re trying to keep aircraft in the air during a narrow spray window, access to parts and knowledgeable A&P mechanics familiar with your specific airframe is worth more than almost any performance specification on a spec sheet.

Is the AT-502B the Right Aircraft for Your Operation?

For most mid-size to large aerial application operations, the AT-502B hits the ideal intersection of payload and performance. If you’re spraying a high volume of acres per season, running multiple fields per day, or working in areas where airstrip access is limited, the AT-502B’s 500-gallon hopper, short-field capability, and proven PT6A powerplant give you the operational flexibility to stay productive regardless of what the day throws at you. It’s not the largest aircraft Air Tractor builds, but for a wide range of operations, it’s the most practical — and that’s exactly why it remains the world’s best-selling ag plane.

Frequently Asked Questions

Here are answers to the most common questions operators and pilots ask about the AT-502B’s performance and capabilities.

What engine powers the Air Tractor AT-502B?

The Air Tractor AT-502B is powered by the Pratt & Whitney PT6A-34AG turboprop engine, producing 750 shaft horsepower.

The PT6A-34AG is a purpose-built agricultural variant of the PT6 series, engineered to handle the constant power cycling, dusty environments, and demanding workloads of low-level ag operations. It’s one of the most proven turboprop engines in agricultural aviation, with an extensive global service network that makes parts and maintenance support accessible even in remote operating areas.

How much can the AT-502B carry in its hopper?

The AT-502B carries 500 gallons (1,893 liters) per load with a total useful load of 5,403 lbs, making it one of the highest-capacity single-engine ag aircraft available.

That hopper volume handles liquid pesticides, dry fertilizers, and seed treatments. For more detailed specifications, you can visit the Air Tractor AT-502B page. Here’s a quick reference for what the AT-502B’s payload capacity means in practical terms:

AT-502B Payload At a Glance
• Hopper capacity: 500 US gallons (1,893 L)
• Useful load: 5,403 lbs
• Compatible materials: Liquid pesticides, dry fertilizer, aerial seeding
• Result: Fewer reloads, more acres per flight hour, better daily throughput

For operators running high-acreage days, fewer reload cycles mean significantly more ground covered before conditions change — whether that’s wind picking up, temperatures rising, or simply running out of daylight.

What is the working speed of the AT-502B during spray operations?

The AT-502B operates at a working speed of 120 to 145 mph during aerial application, balancing coverage uniformity with operational efficiency.

This speed range is one of the AT-502B’s key competitive strengths. Pilots can fine-tune their approach speed based on the crop type, application rate, and field layout without sacrificing either accuracy or productivity. The aircraft remains fully responsive and controllable throughout this working range, even at maximum hopper loads.

• 120 mph: Optimal for high-volume liquid applications requiring slower droplet travel
• 130 mph: Standard working speed for most pesticide and fertilizer applications
• 145 mph: Upper working range for lighter loads and faster field coverage scenarios
• 154 mph: Cruise speed used for ferry legs between airstrip and field

Maintaining consistent speed across passes is critical for even application rates, and the AT-502B’s stable airframe and responsive controls make it easier for pilots to hold precise lines throughout long spray sessions.

Can the AT-502B operate from unimproved airstrips?

Yes. The AT-502B’s short takeoff performance, combined with its robust landing gear and airframe design, allows it to operate from grass strips, gravel surfaces, and temporary staging areas located close to the fields being treated. This short-field capability reduces ferry time significantly — keeping the aircraft productive rather than burning fuel moving between a paved airport and the work site. For operations in remote or rural areas where infrastructure is limited, this is a meaningful operational advantage that directly affects daily throughput. Learn more about the Air Tractor AT-502B.

How does the AT-502B’s 52-foot wingspan benefit crop spraying?

The 52-foot wingspan supports a wider spray swath on each pass across the field, which means fewer total passes required to cover the same acreage. Fewer passes translate directly into reduced fuel consumption, less total flight time per job, and faster field completion — all of which improve profitability per acre treated.

Beyond swath width, the generous wingspan contributes to the aircraft’s overall stability at low altitudes and working speeds. Stable platforms are easier to fly precisely, which reduces operator fatigue and improves application accuracy over the course of a long spray day.

The wingspan also plays a role in the AT-502B’s climb performance by generating lift efficiently even at heavy gross weights. This allows the aircraft to clear terrain obstacles and reach working altitude faster after each reload — a performance characteristic that adds up across dozens of cycles in a single day.

For operations covering large, open fields, the wide swath coverage the 52-foot wingspan enables can be the deciding factor in whether a job gets finished in one session or requires a return trip. That kind of single-visit completion protects crop timing and meets grower expectations for responsive service.