FAA Part 137 Agricultural Aircraft Operations Certificate (UAS Agricultural Dispensing) — Study Guide

FAA Part 137 Agricultural Aircraft Operations Certificate (UAS Agricultural Dispensing) — Study Guide

Credential: Agricultural Aircraft Operator Certificate under 14 CFR Part 137 Issuing body: Federal Aviation Administration (FAA), Flight Standards Jurisdiction: United States (federal) Level: Federal operating certificate (operator-level, not a pilot certificate — it authorizes the operation, held by the business/entity) Prerequisites: (1) Part 107 Remote Pilot Certificate for the person manipulating the controls (FAA exempts Part 137 UAS operations from the normal private/commercial manned-pilot certificate requirement — verified via FAA guidance); (2) pass the knowledge and skill tests of 14 CFR 137.19(e) and 137.41(b)/(c) demonstrating agricultural-dispensing competency; (3) for UAS over 55 lb takeoff weight (fully loaded spray drones typically are): an FAA Section 44807 exemption; (4) the aircraft and operation must meet Part 137 operating rules. Renewal: No fixed expiration stated in the catalogue — currency is tied to Part 107 recurrent training (every 24 calendar months) plus ongoing compliance with the Part 137 certificate's terms. Verify current FAA policy on certificate duration when applying.

Why this credential matters

Any time a drone dispenses a substance onto agricultural land — pesticides, foliar fertilizers, desiccants, cover-crop seed — the operation falls under Part 137 agricultural aircraft operations, and the operator needs a Part 137 certificate. Flying the spray mission on a Part 107 certificate alone is a federal violation. This is the legal gate for the entire agricultural spray-drone industry, and it layers three regulatory regimes on every flight: Part 107 (pilot), Part 137 (agricultural operation), and FIFRA/state pesticide law (what is dispensed).

Pathway

1. Earn Part 107. Pass the 60-question Unmanned Aircraft General knowledge test, complete IACRA application, TSA vetting. (Shared guide: ../shared/faa-part-107-study-guide.md — link, not duplicated here.)
2. Determine aircraft class. If the fully loaded takeoff weight exceeds 55 lb, obtain a Section 44807 exemption (the petition process — allow months). Most agricultural spray drones (30–50 L payload class) exceed 55 lb loaded.
3. Prepare the Part 137 application. FAA guidance for UAS ag operators: operations manual, knowledge/skill test preparation per 137.19(e) (agricultural knowledge: safe handling of economic poisons, effects on plants/animals, weather, application equipment) and 137.41(b)/(c) (skill demonstration).
4. Pass the knowledge and skill tests. Administered per FAA procedures for ag operators — the knowledge test covers dispensing-specific aeronautical knowledge; the skill test is a practical demonstration of agricultural aircraft operation.
5. Certificate issuance. The FSDO issues the Agricultural Aircraft Operator Certificate with operating limitations.
6. Layer pesticide compliance. The Part 137 certificate does not authorize pesticide use — the operator/pilot must also hold state pesticide applicator certification/licensing for the categories applied (see pesticide-applicator-licensing-study-guide.md), and every application must follow the EPA-registered product label (FIFRA — the label is the law).

Knowledge domains

Domain 1 — Part 137 operating rules

Part 137 Subpart C prescribes how ag operations are conducted: operations over congested areas require FAA approval and a plan; dispensing must be done safely with regard to persons and property; pilots must meet the competency tests. For UAS, the key adaptations: the manned-pilot certificate requirement is exempted (Part 107 suffices), but the operator certification, knowledge/skill testing, and operating limitations still apply. Know what a Part 137 certificate's operations specifications contain: authorized aircraft, areas, and limitations.

Domain 2 — Section 44807 exemption (heavy UAS)

49 U.S.C. §44807 allows the FAA to exempt UAS that don't fit Part 107's 55-lb framework. The petition must show an equivalent level of safety: aircraft airworthiness basis, command-and-control link reliability, lost-link procedures, see-and-avoid/DAA provisions, and operating limitations. Processing takes months — business planning must account for it. The exemption typically carries conditions (altitude caps, VLOS or EVLOS provisions, pilot qualifications) that become part of the legal operating envelope.

Domain 3 — Agricultural dispensing knowledge (137.19(e))

Safe handling of "economic poisons" (the statute's term): toxicity categories, label comprehension, spill response, equipment decontamination. Effects of dispensed materials on plants, animals, and persons — drift damage to neighboring crops is the classic liability. Meteorology for application: temperature inversions (the #1 drift-weather trap — calm, clear mornings trap spray in a concentrated layer that moves laterally), wind speed/direction limits, humidity and evaporation effects on droplet spectra. Application equipment: calibration, nozzle selection per ASABE S572 droplet spectra, swath width determination, and the relationship between droplet size and drift (fine droplets drift; the label's droplet-size requirement is legally binding).

Domain 4 — Skill demonstration (137.41(b)/(c))

Practical demonstration of agricultural aircraft operation: preflight inspection of the dispensing system, calibration verification, swath runs demonstrating uniform application and obstacle/terrain management, emergency procedures (engine/motor failure with a loaded hopper, lost link, flyaway containment), and shutdown/securing procedures. For UAS: automated mission planning with manual takeover proficiency.

Domain 5 — The pesticide-law layer

FIFRA: only EPA-registered products, applied per label (rates, droplet spectra, buffer zones, restricted-entry intervals). State applicator licensing: commercial applicator certification in the relevant categories (agricultural plant, aerial) plus business licensing and drift-liability insurance in many states. The Part 137 operator who sprays without the pesticide credential violates two federal regimes simultaneously.

Worked examples

Example 1 — Exemption determination. A spray drone: empty 32 kg, 40 L tank (40 kg liquid), batteries included in empty weight. Takeoff weight = 72 kg ≈ 159 lb > 55 lb → Section 44807 exemption required before Part 137 operations. The operator plans the business timeline around a multi-month petition — or selects a smaller platform, trading payload for regulatory simplicity.

Example 2 — Swath and application rate. Drone: 8 m effective swath, 6 m/s ground speed, flow rate 2.4 L/min. Application rate (L/ha) = flow / (speed × swath) × 600 = 2.4/(6×8)×600 = 2.4/48×600 = 30 L/ha. Label requires 30–40 L/ha → compliant at this speed; increasing speed to 8 m/s drops to 22.5 L/ha → off-label. Calibration discipline is legal compliance, not agronomy.

Example 3 — Inversion risk. Clear calm morning, 6:30 AM, temperature 12°C at 2 m and 14°C at 10 m (inversion). Spraying now risks the droplet cloud hanging in the stable layer and drifting kilometers when the inversion breaks. Correct decision: delay until surface heating breaks the inversion (typically mid-morning), document the weather observation — the applicator's log is the liability shield.

Example 4 — Drift buffer. Label requires a 25-ft downwind buffer to sensitive areas. Field is 800 ft wide with a neighboring vineyard on the east edge; wind from the west at 8 mph. The operator must leave the easternmost 25+ ft unsprayed (plus a safety margin — label buffers are minimums) or wait for a wind shift. Spraying the buffer is a FIFRA label violation regardless of whether damage occurs.

Standards/regulations cross-reference

• 14 CFR Part 107 — pilot certification and small-UAS operating rules (shared guide).
• 14 CFR Part 137 — the agricultural operations rule (this guide).
• 49 U.S.C. §44807 — the heavy-UAS exemption authority.
• FIFRA + 40 CFR Part 171 — pesticide applicator certification (merged pesticide guide).
• State pesticide laws — applicator licensing, business registration, insurance.
• ASABE S572 — droplet spectra classification (label-referenced drift compliance).
• 14 CFR Part 137 operating limitations — congested-area operations, dispensing safety.

Pitfalls

1. Part 107 alone is not enough. The most common violation in the spray-drone industry — dispensing without Part 137.
2. The 55-lb trap. Operators buy a 40-L drone, load it, and discover they're 100 lb over Part 107 limits with no 44807 exemption — grounded until the petition processes.
3. Label buffers are minimums, not targets. Drift damage within a complied-with buffer is still the operator's problem civilly; outside it, it's a FIFRA violation too.
4. Inversion spraying. The weather condition most likely to cause a multi-farm drift incident — and the hardest to explain to an inspector afterward without logged observations.
5. State pesticide licensing. The FAA certificate doesn't cover it; many states require commercial applicator certification and an aerial/UAS category endorsement.

Practice problems

1. A drone weighs 28 kg empty and carries 30 L of spray mix. Does it need a Section 44807 exemption? Show the math.
2. Swath 6 m, speed 5 m/s, flow 1.8 L/min. Compute L/ha. The label specifies 20–30 L/ha — compliant?
3. List the three regulatory layers governing a commercial spray-drone operation and what each authorizes.
4. Morning conditions: fog in low spots, no wind, clear sky. Spray or wait? Justify with the inversion mechanism.
5. A Part 137 operator's pilot holds Part 107 but no state pesticide license. They spray a general-use herbicide for hire. Identify the violation(s).

Answers

1. 28 + 30 = 58 kg ≈ 128 lb > 55 lb → yes, 44807 exemption required.
2. 1.8/(5×6)×600 = 1.8/30×600 = 36 L/ha — above the 30 L/ha label maximum → non-compliant; reduce flow or increase speed.
3. (a) Part 107 — pilot qualification and UAS operating rules. (b) Part 137 (+44807 if heavy) — authorization to conduct agricultural dispensing operations. (c) FIFRA/state pesticide law — authorization to apply the specific pesticide (applicator certification + label compliance).
4. Wait. Fog in low spots + calm + clear = classic radiation inversion; spray would hang in the stable layer and drift unpredictably when the inversion breaks. Log conditions, delay until mixing develops.
5. (a) State law: commercial application for hire without applicator licensing — violation in states requiring it (most do, even for general-use products applied commercially). (b) Potential FIFRA issues depending on product classification. The FAA side is compliant; the pesticide side is not.

Original ETS reference writing, verified against public sources on 2026-09-30. Thin sourcing is flagged inline. Not legal advice — confirm current editions with the issuing body.