Write short note on longitudinal gradient of runway

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written 3.0 years ago by

teamques10 ★ 68k

longitudinal gradient gets transformed into the effective gradient, which is used as a design parameter for finding out the length of any runway strip.So, therefore we are taking these two things together here and what we found is that the longitudinal gradient of a runway increases the required runway length and it is a zero gradient condition, then there is no change in the length of the runway strip.
- But, as soon as there is a longitudinal gradient, then the length of the runway strip will change. It also affects the aircraft performance in the sense that if there are number of gradients being provided, then at the point where the two gradients are meeting each other there is kink being formed and as the aircraft traverses this kink, there are chances of a structural disability, deformation coming within the aircraft. So, this particular amount by which the two longitudinal gradients have been connected with each other that is what is the steepness of those two longitudinal gradients will define that amount of damage which may be caused to any aircraft.
- Now, ICAO has limitized the maximum longitudinal gradient to 1.25% to 1.5% of runways that serve the largest type of aircraft. So, that is the limited value being provided by the ICAO rate of change of effective longitudinal gradient. In this case, what we have to look at is that at what particular rate the effective longitudinal gradient is changing, then that should not be abrupt.
- If it is abrupt, then this abrupt grade change will cause premature lift off of the aircraft during taking off, because if it is abrupt and as soon as there is an upgrade being followed by a downgrade, we will find that there will be a lift which will be induced on the aircraft and this lift will be premature lift instead of the designated point from where the lift should have taken place, this lift will be taking place before that.

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