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

Question

Question

This question was previously asked in

ESE Civil 2019 Official Paper

Answer 1

Factors affecting basic runway length
Aircraft characteristics	Power and propulsion system Type of an aircraft
Safety requirements	Normal landing Normal take-off case Engine failure case while take-off
Airport environment	Atmosphere Temperature wind Location and condition of the runway Altitude 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.