Ignition Techniques & Control Flashcards

When conducting strip-head firing, what primarily controls the intensity of the fire as strips burn together?

Answer: The width of the strips between ignition lines

Wider strips allow the head fire to build more momentum and intensity, while narrower strips keep intensity lower.

A burn boss observes that strips are producing flame lengths above prescription. Which adjustment is most appropriate?

Answer: Narrow the strip spacing or convert to backing fire

Reducing strip width or using backing fire lowers rate of spread and flame length.

Flanking fire is ignited in which orientation relative to the wind?

Answer: Parallel to the wind direction

Flanking fire lines are lit parallel to the wind so the fire spreads laterally at intermediate intensity.

Which ignition technique is most dependent on a steady, consistent wind direction to remain safe and effective?

Answer: Flanking fire

Flanking fire requires a consistent wind direction because a wind shift can turn flanks into head fires.

In spot (grid) ignition, what happens when spots are placed too close together?

Answer: Junction zones produce higher intensity as spots merge

Closely spaced spots merge quickly, creating junction zones with elevated intensity.

Why is a test fire typically ignited in a location representative of the unit but easily controlled?

Answer: To verify fire behavior meets prescription while minimizing escape risk

The test fire confirms predicted behavior and smoke conditions before committing to full ignition.

Who on a prescribed fire is generally responsible for supervising igniters and coordinating firing patterns with holding?

Answer: Firing Boss (FIRB)

The Firing Boss supervises ignition personnel and coordinates firing operations under the burn boss.