Charliedontsurf_83
14th Jan 2016, 21:01
Hi,
recently we had some debates over what should be considered as a departure time in ICAO FPL format.
In the Item 13 we insert the departure time, which should be off block time as per explanation given in Skybrary. I failed to find any respective ICAO definition, but no doubts here: at least in Europe, if you file ETD for 1400UTC, it will be shown as EOBT 1400 UTC.
The estimated elapsed time though is as per ICAO definition as the time required from take-off to arrive over that designated point, so the time enroute, or trip time, is calculated for the time frame between take off and arriving over navaid.
That means if we want to calculate the ETA, we can not just add the ETE to ETD value, which appears to be a common mistake, but rather ETA = ETD+(taxi time)= TOT as take off time.
TOT + ETE = ETA.
The problem is, neither the take off time nor taxi time are stated nowhere in the FPL, so where exactly should we start to count the EET?
I mean Eurocontrol provides some taxi time statistics plus most airlines have their own, but then again, they are not stated in the FPL, so if you don't know it, you can' t really define the ETA.
recently we had some debates over what should be considered as a departure time in ICAO FPL format.
In the Item 13 we insert the departure time, which should be off block time as per explanation given in Skybrary. I failed to find any respective ICAO definition, but no doubts here: at least in Europe, if you file ETD for 1400UTC, it will be shown as EOBT 1400 UTC.
The estimated elapsed time though is as per ICAO definition as the time required from take-off to arrive over that designated point, so the time enroute, or trip time, is calculated for the time frame between take off and arriving over navaid.
That means if we want to calculate the ETA, we can not just add the ETE to ETD value, which appears to be a common mistake, but rather ETA = ETD+(taxi time)= TOT as take off time.
TOT + ETE = ETA.
The problem is, neither the take off time nor taxi time are stated nowhere in the FPL, so where exactly should we start to count the EET?
I mean Eurocontrol provides some taxi time statistics plus most airlines have their own, but then again, they are not stated in the FPL, so if you don't know it, you can' t really define the ETA.