What are the multiplication factors for landing on a contaminated runway?

What are the multiplication factors for landing on a contaminated runway?

• A. 1.15 paved wet; 1.15 grass
• B. 1.2 dry grass; 1.3 wet grass
• C. 1.25 for all surfaces
• D. 1.43 LDR

Answer: (A)

Contaminated runways slow braking, so the landing distance required increases. For the typical ME-IR performance charts, the published multiplier for a contaminated surface is 1.15 for both paved wet surfaces and grass. This means you take the dry landing distance and multiply by 1.15 to estimate the landing distance on a contaminated runway. In other words, if your dry LDA is X, the contaminated LDA is about 1.15 × X. Other multipliers (like 1.2, 1.3, or 1.25, or a single 1.43 for all surfaces) do not match the standard contamination factors used for these surface types in this context.

Contaminated runways slow braking, so the landing distance required increases. For the typical ME-IR performance charts, the published multiplier for a contaminated surface is 1.15 for both paved wet surfaces and grass. This means you take the dry landing distance and multiply by 1.15 to estimate the landing distance on a contaminated runway.

In other words, if your dry LDA is X, the contaminated LDA is about 1.15 × X. Other multipliers (like 1.2, 1.3, or 1.25, or a single 1.43 for all surfaces) do not match the standard contamination factors used for these surface types in this context.