IFH 3-10

25 Normal Approach 25 Normal Approach 25 25 25 Normal Approach 25 Normal Approach Downsloping runway Upsloping runway Upsloping runwayDownsloping runway Wider runwayNarrower runway Wider runwayNarrower runway Normal approach Approach due to illusion Figure 3-9A Runway width illusion • A narrower-than-usual runway can created an illusion that the aircraft is higher than it actually is, leading to a lower approach. • A wider-than-usual runway can create an illusion that the aircraft is lower than it actually is, leading to a higher approach. Figure 3-9B Runway slope illusion • A downsloping runway can create the illusion that the aircraft is lower than it actually is, leading to a higher approach. • An upsloping runway can create the illusion that the aircraft is higher than it actually is, leading to a lower approach. Figure 3-9. Runway width and slope illusions. 5. Utilize the visual descent point (VDP) found on many nonprecision instrument approach procedure charts. 6. Recognize that the chances of being involved in an approach accident increase when some emergency or other activity distracts from usual procedures. 7. Maintain optimum proficiency in landing procedures.