The additional ASMA time is a proxy for the average arrival runway queuing time on the inbound traffic flow, during congestion periods at airports.
It is the difference between the actual ASMA time of a flight and a statistically determined unimpeded ASMA time based on ASMA times in periods of low traffic demand.
When monitoring ASMA performance at airports, it is important to note that the goal is not to reduce ASMA time to the unimpeded reference time - as this could negatively impact on runway throughput - but rather to reduce additional ASMA time and associated fuel burnt to the necessary minimum.
| Column name | Data source | Label | Column description | Example |
|---|---|---|---|---|
| YEAR | Network Manager | YEAR | Reference year | 2014 |
| MONTH_NUM | Network Manager | MONTH | Month (numeric) | 1 |
| MONTH_MON | Network Manager | MONTH_MON | Month (3-letter code) | JAN |
| APT_ICAO | PRU | APT_ICAO | ICAO 4-letter airport designator | EBBR |
| APT_NAME | PRU | APT_NAME | Airport name | Brussels |
| STATE_NAME | PRU | STATE_NAME | Country in which the airport is located | Belgium |
| ASMA_RADIUS | PRU | ASMA_RADIUS | The radius around the airport (in NM) used for the ASMA calculation | 40 |
| FLT_ASMA_UNIMP_2 | NM_Airport | IFR flights with unimpeded reference time | 7290 | |
| TIME_ASMA_UNIMP_2 | NM_Airport | Total unimpeded reference ASMA time in minutes | 60081 | |
| TIME_ASMA_ADD_2 | NM_Airport | Total additional ASMA time in minutes | 15175 |
\[ \begin{align*} \text{Average additional ASMA time} & = \frac{\text{TIME_ASMA_ADD_2}}{\text{FLT_ASMA_UNIMP_2}} \end{align*} \]
\[ \begin{align*} \text{Average unimpeded ASMA time} & = \frac{\text{TIME_ASMA_UNIMP_2}}{\text{FLT_ASMA_UNIMP_2}} \end{align*} \]