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Which one of the following instances of performance of aircraft is not considered for determining basic runway length?

Which one of the following instances of performance of aircraft is not considered for determining basic runway length? Correct Answer Emergency landing case

Factors affecting basic runway length

Aircraft characteristics
  1. Power and propulsion system
  2. Type of an aircraft

Safety requirements

 
  1. Normal landing
  2. Normal take-off case
  3. Engine failure case while take-off

Airport environment
  1. Atmosphere
    1. Temperature
    2. wind
  2. Location and condition of the runway
    1. Altitude
    2. Runway gradient

Important point:

Basic runway length is calculated with the following assumptions:

i) It is calculated at Mean sea level (MSL)

ii) It is calculated for standard temp 15°C at MSL.

iii) The gradient is assumed to be zero.

Due to the variance of these assumptions, some corrections are applied.

i) Elevation Correction: 7% increase in basic runway length for every 300 m rise above MSL

ii) Temperature correction: 1% increase for every 1°C rise in airport reference temperature with respect to standard temperature at elevation.

Where,

Standard temperature at elevation = Temperature at MSL – 0.0065 × Elevation

This increase is made on the already corrected runway length for elevation.

iii) Gradient correction: 20% increase for 1% of effective gradient.

Related Questions

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1. The basic runway length should be increased at the rate of 7 percent per 300 m rise in elevation above the mean sea level.
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3. The runway length after having been corrected for elevation and temperature should be further increased at the rate of 20% for every 1 percent of effective gradient.
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