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LERX Leading-Edge Root eXtension.

It consists of a number on a continuous scale, ranging from 0 on the lower end and with no upper limit, that is computed between two pavement types (rigid or flexible), and the subgrade support strength category. The value is calculated based on a number of factors, such as aircraft geometry and a pavement's traffic patterns, and is not necessarily the direct bearing strength of the pavement.A PCN of 80/R/B/W/T would mean that the underlying pavement's value indicating load-carrying capacity is 80 (unitless), is rigid (and thus is likely concrete), is on a medium-strength subgrade, has no limit on tire pressure, and has been calculated through technical evaluation.The fifth and final part describes how the first value was worked out, a T indicating a technical evaluation, and a U indicating usage – a physical testing regime. An aircraft having an ACN equal to or less than the PCN can operate without weight restrictions on a pavement.The ACN of an airplane is a function of not only its weight but also the design parameters of its landing gear such as the distances between the wheels of a multiple-wheel landing gear assembly.The ACN is a single unique number expressing the relative effect of an aircraft on a pavement for a specified subgrade strength specifying a particular pavement thickness.

In fact the ICAO documentation makes it very clear that it is not a design/evaluation method and that the PCN is simply the ACN of the most damaging aircraft that can use the pavement on a regular basis (regular being defined by the operator).As per October 2007, ICAO revised the alpha factor for four wheel undercarriages. But I'm really confused where an airfield still just lists Maximum AUW (all up weight in x1000Kgs) dependant upon type of undercarriage assembly. Here on acronym.io, we define the meanings of all kinds of acronyms, abbreviations and initialisms, including those relating to aviation such as LCN. The aircraft classification number (ACN) is a number expressing the relative effect of an aircraft on the runway pavement for a specified standard subgrade category, using a method defined by the International Civil Aviation Organization (ICAO).. The ACN is not permitted to exceed the PCN of the runway to be used, in order to prolong pavement life and prevent possible pavement damage.The ranges of subgrade strength covered by these standard subgrade categories (designated as A, B, C and D) are shown below.“The bearing strength of a pavement intended for aircraft of apron (ramp) mass greater than 5700 kg shall be made available using the aircraft classification number – pavement classification number ACN-PCN method………” (ICAO Annex 14, clause 2.6.2)The flexible pavements have four subgrade categories:The ACN-PCN system provides a standardised international airplane/pavement rating system replacing the various S, T, TT, LCN, AUW, ISWL, etc., rating systems throughout the world. In exceptional cases, the forwardmost CG position may make the nose-landing gear loading more critical.The ACN is defined for only four subgrade categories (high, medium, low, and ultra low).The ACN is twice the derived single-wheel load expressed in thousands of kilograms, with single-wheel tire pressure standardized at 1.25 megapascals (= 181 psi). change the alpha factors for other main landing gears so that the ranking of the damaging effect remains consistent.The ACN-PCN system of rating airport pavements is designated by the International Civil Aviation Organization (ICAO) as the only approved method for reporting strength.
Unfortunately the fact that the method of calculating ACN utilises two common design and analysis methods (the CBR equation and Westergaard theories) has led a surprisingly large number of people to assume that it is a design and evaluation method.