Additional ASMA Time

The Additional ASMA time is the difference between the actual ASMA transit time and the unimpeded ASMA time calculated for non-congested conditions.

Unit of Measurement

Minute.

Calculation of the indicator

Let

  • \(c\), a combination of aircraft class, ASMA sectors and arrival runway, as described in the technical note for unimpeded ASMA time,
  • \(f(c)\), a flight characterised by a combination \(c\),
  • \(\textrm{AcASMA}(f(c))\), the actual ASMA transit time for a flight \(f(c)\), i.e.┬áthe elapsed time between the last entry of the flight \(f(c)\) in its ASMA sector and its actual landing time (ALDT),
  • \(\textrm{UASMA}(c)\), the unimpeded ASMA time for a combination \(c\).

The additional ASMA time, \(\textrm{AdASMA}(f(c))\), is calculated for each flight \(f(c)\) as the difference between the actual ASMA transit time \(\textrm{AcASMA}(f(c))\) of the flight and the unimpeded ASMA time \(\textrm{UASMA}(c)\):

\[ \textrm{AdASAM}(f(c)) = \textrm{AcASMA}(f(c)) - \textrm{UASMA}(c) \]

The additional ASMA time, \(\textrm{AdASMA}(c)\), for a given combination \(c\) is the average of the additional ASMA time, \(\textrm{AdASMA}(f(c))\) of all the flight \(f(c)\) characterised by that combination \(c\).

The additional ASMA time, \(\textrm{AdASMA}\), for a given airport is the weighted average of the additional ASMA time, \(\textrm{AdASMA}(c)\), for all the combinations \(c\) at that airport with their probability of occurrence.