Ignition Techniques & Control Flashcards

Plastic sphere dispensers (PSDs) used in aerial ignition rely on what chemical reaction?

Answer: Potassium permanganate and ethylene glycol

PSD spheres contain potassium permanganate injected with ethylene glycol, producing a delayed exothermic ignition.

A helitorch dispenses what type of fuel?

Answer: Gelled gasoline

Helitorches drop ignited gelled gasoline, producing intense ignition suitable for heavy fuels and slash.

What is a primary advantage of aerial ignition over hand ignition on large units?

Answer: Rapid, uniform ignition over large or inaccessible areas

Aerial ignition quickly covers large or rugged areas with consistent ignition patterns.

Ignition was planned to proceed into the wind, but the wind has shifted 90 degrees. What is the best immediate action for the Firing Boss?

Answer: Pause ignition and reassess the firing pattern with the burn boss

Wind shifts can convert backing or flanking fire into head fire, so ignition should pause for reassessment.

A terra torch is best described as:

Answer: A truck- or trailer-mounted device that projects ignited gelled fuel

Terra torches are ground-based units that throw a stream of burning gelled fuel.

Fusees are often preferred over drip torches in which situation?

Answer: Ignition in fine flashy fuels such as grass, where quick, light ignition is needed

Fusees are lightweight and effective for lighting fine fuels like grass.

Why should igniters maintain communication and avoid getting ahead of holding forces?

Answer: To ensure holding can secure the line before fire pressure builds

Ignition outpacing holding increases slopover and escape risk.