IOWA AERIAL APPLICATORS STUDY GUIDE 2025/2026
QUESTIONS AND SOLUTIONS GRADED A+
✔✔When should you use spray pressure to decrease boom output - ✔✔When you want
to make 10% or less in boom output
✔✔If you want to increase output of nozzle by 2 with spray pressure, how much should
you increase spray pressure - ✔✔4x
✔✔Better to set spray system at lowest or highest operating pressure - ✔✔Lowest
because it is less likely to emit drift droplets and doesn't wear out tips as fast
✔✔How do ram air spreaders compromise aircraft performance - ✔✔Can cause
considerable drag
✔✔Which type of metering gate on ram air spreader is used to disperse liquid and dry -
✔✔Hinged metering gate
✔✔Which type of metering gate requires more frequent calibration - ✔✔Hinged
metering gate
✔✔What is wrong if hinged metering gate is distributing unevenly - ✔✔Rubber gate
cover is likely worn out
✔✔What are spreader vanes - ✔✔Partitions of a ram air spreader ducts which prevent
particle movement from one duct to another
✔✔Problems of spreader tail mounted improperly - ✔✔1. Turbulence and drag may
increase
2. Deposition of pesticide on aircraft tailgear may increase
3. Uneven swath pattern
4. Swath may become more and more narrow
✔✔What happens to swath width if you increase hopper feed rate of ram air -
✔✔Decrease because particle stream exiting the duct becomes heavier
✔✔What two ways do liquid pesticide products indicate the amount of active ingredient
they have - ✔✔1. Pounds of a.i. per gallon
2. Percentage of the formularies total weight
✔✔Problems that can occur if equipment is not calibrated - ✔✔1. Ineffective control
2. Waste time and money
3. Chemicals in environment for no purpose
4. Overapplication
, 5. Increase exposure and drift
✔✔When pesticide label lists a range what must you consider - ✔✔1. Pest biology
2. Pesticide chemistry
3. Crop growth stage
4. Weather conditions
5. Drift potential
✔✔When can you apply amount different from label - ✔✔Only when less than
recommended
✔✔Three variables that influence discharge rate - ✔✔1. Nozzle tip size
2. Number of nozzles
3. Spray pressure
✔✔Two variables that influence APM - ✔✔1. Swath width
2. Speed of aircraft
✔✔Best time to conduct pattern testing - ✔✔Early morning before thermal turbulence
with wind less than 10 mph
✔✔What can a pattern test help you determine - ✔✔1. Nozzle positioning along boom
2. Spray uniformity
3. Effective swath width
✔✔Most common way to prevent propwash displacement - ✔✔Add nozzles to right side
of the boom and remove from left
✔✔How does wingtip or rotor vortex cause drift - ✔✔Captures spray and propels it
upward
✔✔ Measures to control fatigue - ✔✔1. Sleep
2. Balanced diet
3. Scheduled breaks
4. Realistic deadlines
✔✔Knowledge and skills to complete pesticide treatment - ✔✔1. Know aircraft features
2. Know weather
3. Follow label instructions
4. Familiar with pesticide
5. Recognize plants from air
6. Know where to spray and maneuver
7. Communicate with ground crew
✔✔Precautionary steps before application - ✔✔1. Clean clothes, helmet, and harness
QUESTIONS AND SOLUTIONS GRADED A+
✔✔When should you use spray pressure to decrease boom output - ✔✔When you want
to make 10% or less in boom output
✔✔If you want to increase output of nozzle by 2 with spray pressure, how much should
you increase spray pressure - ✔✔4x
✔✔Better to set spray system at lowest or highest operating pressure - ✔✔Lowest
because it is less likely to emit drift droplets and doesn't wear out tips as fast
✔✔How do ram air spreaders compromise aircraft performance - ✔✔Can cause
considerable drag
✔✔Which type of metering gate on ram air spreader is used to disperse liquid and dry -
✔✔Hinged metering gate
✔✔Which type of metering gate requires more frequent calibration - ✔✔Hinged
metering gate
✔✔What is wrong if hinged metering gate is distributing unevenly - ✔✔Rubber gate
cover is likely worn out
✔✔What are spreader vanes - ✔✔Partitions of a ram air spreader ducts which prevent
particle movement from one duct to another
✔✔Problems of spreader tail mounted improperly - ✔✔1. Turbulence and drag may
increase
2. Deposition of pesticide on aircraft tailgear may increase
3. Uneven swath pattern
4. Swath may become more and more narrow
✔✔What happens to swath width if you increase hopper feed rate of ram air -
✔✔Decrease because particle stream exiting the duct becomes heavier
✔✔What two ways do liquid pesticide products indicate the amount of active ingredient
they have - ✔✔1. Pounds of a.i. per gallon
2. Percentage of the formularies total weight
✔✔Problems that can occur if equipment is not calibrated - ✔✔1. Ineffective control
2. Waste time and money
3. Chemicals in environment for no purpose
4. Overapplication
, 5. Increase exposure and drift
✔✔When pesticide label lists a range what must you consider - ✔✔1. Pest biology
2. Pesticide chemistry
3. Crop growth stage
4. Weather conditions
5. Drift potential
✔✔When can you apply amount different from label - ✔✔Only when less than
recommended
✔✔Three variables that influence discharge rate - ✔✔1. Nozzle tip size
2. Number of nozzles
3. Spray pressure
✔✔Two variables that influence APM - ✔✔1. Swath width
2. Speed of aircraft
✔✔Best time to conduct pattern testing - ✔✔Early morning before thermal turbulence
with wind less than 10 mph
✔✔What can a pattern test help you determine - ✔✔1. Nozzle positioning along boom
2. Spray uniformity
3. Effective swath width
✔✔Most common way to prevent propwash displacement - ✔✔Add nozzles to right side
of the boom and remove from left
✔✔How does wingtip or rotor vortex cause drift - ✔✔Captures spray and propels it
upward
✔✔ Measures to control fatigue - ✔✔1. Sleep
2. Balanced diet
3. Scheduled breaks
4. Realistic deadlines
✔✔Knowledge and skills to complete pesticide treatment - ✔✔1. Know aircraft features
2. Know weather
3. Follow label instructions
4. Familiar with pesticide
5. Recognize plants from air
6. Know where to spray and maneuver
7. Communicate with ground crew
✔✔Precautionary steps before application - ✔✔1. Clean clothes, helmet, and harness
