AERIAL APPLICATION TEST PAPER 2025/2026 QUESTIONS
AND ANSWERS RATED A+
✔✔Centrifugal pump - ✔✔Most common
High Volume, low Pressure
Output: 200+ gal/MIN
around 5000 rpm to operate
✔✔Fan Driven Pumps - ✔✔under aircraft, in propeller slipstream
✔✔Why do motor-driven pumps need extra capacity? - ✔✔To offset pressure loss from
friction and run anti-drip valves
✔✔What happens if a pump is undersized? - ✔✔Reduces swath width, causing poor
coverage and wasted fuel/time
✔✔Interior Baffles - ✔✔internal dividers designed to reduce liquid movement (slosh)
during flight
✔✔Fiberglass - ✔✔Less weight, but it absorbs pesticide liquids if scratched, which
contaminates future tank loads. is easy to repair
✔✔what are the dual uses of tanks - ✔✔hold liquids for spraying and hoppers for dry
material
✔✔Emergency dump valve - ✔✔quickly release load
✔✔Tank Vents - ✔✔prevent vacuum that would stop flow
✔✔Visual Gauge - ✔✔Shows liquid level
✔✔Hydraulic agitation - ✔✔uses spray liquid returned to tank to keep mix stirred
✔✔Purpose of filters and screens - ✔✔Protect system, prevent nozzle clogs
Higher Mesh=Finer screen
✔✔Spray System Piping Requirements - ✔✔Use larger pipes (up to 3") for good flow.
Smaller pipes (1-1.5") okay for low-volume, slow-speed aircraft. Must handle pump's
max output.
✔✔How do hoses degrade internally - ✔✔sunlight exposure, high temp, vibration, long
term chemical exposure
, ✔✔Positive Shut-Off Valve - ✔✔Placed before nozzles; stops dripping when system is
off.
✔✔Suckback Feature - ✔✔Creates slight vacuum in boom to prevent nozzle drip;
shows on pressure gauge.
✔✔Without Check Valves... - ✔✔Too much vacuum can drain boom, causing spray
delays.
✔✔Spray booms - ✔✔support nozzles along the wingspan or rotor span, carries liquid
to nozzles
✔✔Streamlined booms: - ✔✔least turbulence
✔✔Airfoil shaped boom - ✔✔moderate turbulence
✔✔Round Booms - ✔✔most turbulence
✔✔Boom length guide for FIXED WING - ✔✔75% of wingspan
✔✔Boom length guide for ROTARY WING - ✔✔75% of rotor diameter
✔✔What can happen if boom lengths are too long - ✔✔wing/rotor vortices (spiraling air
currents) and causes drift
✔✔Boom End Maintenance - ✔✔End caps help flushing but trap air, causing spray
delay. Fix with air bleed lines
✔✔Flow meters - ✔✔measure the volume of liquid from the pump to the nozzle
✔✔Valves - ✔✔Control spray flow and direction, allow system shutoff or section control
✔✔Pressure gauge - ✔✔Mesures spray system pressure to maintain correct nozzle
output, droplet size, and spray pattern
✔✔What do you do if the electronic flow control system fails - ✔✔use the pressure
gauge to monitor application manually
✔✔Application Volume Categories: CONVENTIONAL - ✔✔5-15+ gallons/acre
High spray volume, broad coverage
✔✔Application Volume Categories: LOW VOLUME (LV) - ✔✔0.5-5 gallons/acre
Less spray than conventional, still good coverage
AND ANSWERS RATED A+
✔✔Centrifugal pump - ✔✔Most common
High Volume, low Pressure
Output: 200+ gal/MIN
around 5000 rpm to operate
✔✔Fan Driven Pumps - ✔✔under aircraft, in propeller slipstream
✔✔Why do motor-driven pumps need extra capacity? - ✔✔To offset pressure loss from
friction and run anti-drip valves
✔✔What happens if a pump is undersized? - ✔✔Reduces swath width, causing poor
coverage and wasted fuel/time
✔✔Interior Baffles - ✔✔internal dividers designed to reduce liquid movement (slosh)
during flight
✔✔Fiberglass - ✔✔Less weight, but it absorbs pesticide liquids if scratched, which
contaminates future tank loads. is easy to repair
✔✔what are the dual uses of tanks - ✔✔hold liquids for spraying and hoppers for dry
material
✔✔Emergency dump valve - ✔✔quickly release load
✔✔Tank Vents - ✔✔prevent vacuum that would stop flow
✔✔Visual Gauge - ✔✔Shows liquid level
✔✔Hydraulic agitation - ✔✔uses spray liquid returned to tank to keep mix stirred
✔✔Purpose of filters and screens - ✔✔Protect system, prevent nozzle clogs
Higher Mesh=Finer screen
✔✔Spray System Piping Requirements - ✔✔Use larger pipes (up to 3") for good flow.
Smaller pipes (1-1.5") okay for low-volume, slow-speed aircraft. Must handle pump's
max output.
✔✔How do hoses degrade internally - ✔✔sunlight exposure, high temp, vibration, long
term chemical exposure
, ✔✔Positive Shut-Off Valve - ✔✔Placed before nozzles; stops dripping when system is
off.
✔✔Suckback Feature - ✔✔Creates slight vacuum in boom to prevent nozzle drip;
shows on pressure gauge.
✔✔Without Check Valves... - ✔✔Too much vacuum can drain boom, causing spray
delays.
✔✔Spray booms - ✔✔support nozzles along the wingspan or rotor span, carries liquid
to nozzles
✔✔Streamlined booms: - ✔✔least turbulence
✔✔Airfoil shaped boom - ✔✔moderate turbulence
✔✔Round Booms - ✔✔most turbulence
✔✔Boom length guide for FIXED WING - ✔✔75% of wingspan
✔✔Boom length guide for ROTARY WING - ✔✔75% of rotor diameter
✔✔What can happen if boom lengths are too long - ✔✔wing/rotor vortices (spiraling air
currents) and causes drift
✔✔Boom End Maintenance - ✔✔End caps help flushing but trap air, causing spray
delay. Fix with air bleed lines
✔✔Flow meters - ✔✔measure the volume of liquid from the pump to the nozzle
✔✔Valves - ✔✔Control spray flow and direction, allow system shutoff or section control
✔✔Pressure gauge - ✔✔Mesures spray system pressure to maintain correct nozzle
output, droplet size, and spray pattern
✔✔What do you do if the electronic flow control system fails - ✔✔use the pressure
gauge to monitor application manually
✔✔Application Volume Categories: CONVENTIONAL - ✔✔5-15+ gallons/acre
High spray volume, broad coverage
✔✔Application Volume Categories: LOW VOLUME (LV) - ✔✔0.5-5 gallons/acre
Less spray than conventional, still good coverage
