Ignition Techniques & Control Flashcards

Which firing technique typically produces the lowest intensity and slowest rate of spread?

Answer: Backing fire

Backing fire spreads against the wind or downslope at low intensity.

Why is backing fire often used along the downwind control line before interior ignition?

Answer: To create a widened black line that can stop later head fires

Backing fire builds depth of black along the downwind edge, securing the unit for interior ignition.

Mass ignition of a unit (e.g., rapid aerial ignition of the whole area) is used to:

Answer: Create a strong convection column that lofts smoke high and reduces residual smoke

Rapid mass ignition builds a strong convection column, improving smoke lift and shortening burn duration.

When fuel moisture varies across a unit, how should the firing pattern typically be adjusted?

Answer: Narrow strips in drier fuels and widen them in moister fuels

Drier fuels burn more intensely, so narrower strips control intensity, while moister fuels need wider strips to carry fire.

What is the main reason to ignite interior strips progressively away from the black line rather than randomly?

Answer: To ensure each new strip burns into existing black, limiting run distance

Progressive ignition from black keeps each strip's run short and fire behavior predictable.

An igniter notices a spot fire across the control line. What should be done first?

Answer: Notify the Firing Boss and holding immediately so ignition can be held

Prompt notification lets holding respond and the Firing Boss suspend ignition if needed.

Dot or spot ignition in a heavily stocked stand is often chosen to:

Answer: Keep fire intensity low and reduce crown scorch under a canopy

Properly spaced spots produce low-intensity fire that limits scorch to overstory trees.