12.104 Landing Performance

12.104.2 Given typical performance data, demonstrate the ability to determine LDR.

To determine Landing Distance Required (LDR), use the aircraft’s performance charts or data and apply the appropriate corrections for existing conditions.

Basic Method

1. Start with the basic landing distance
From the POH/AFM chart, using:

• Aircraft landing weight
• Pressure altitude / density altitude
• Temperature

This gives the base landing distance.

2. Apply corrections for conditions, such as:

• Headwind / tailwind
• Runway slope
• Runway surface condition (wet, grass, soft, sealed)
• Flap setting
• Approach speed
• Braking effectiveness

3. Add safety factor if required
(As specified by manufacturer or operating rules)

Example