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Delays
 
ICAO requires that an appropriate delay message (DLA) must be sent if the EOBT is more than 30 minutes later than that already shown in the FPL. It is important that, in the event of a delay of 30 minutes or more to the EOBT, the pilot advises the departure aerodrome ATSU/Parent Unit so that a DLA message can be sent.
 
In order to meet the requirements of ATFM, all IFR aircraft operating within Europe must have any changes to their EOBT of +/- 15 minutes notified to the Integrated Flight Plan Processing System (IFPS).
 
 
Departures
 
The pilot is responsible for ensuring that the airborne time of the flight is passed to the ATSU with whom the flight plan has been filed. The ATSU will ensure that the departure (DEP) message is sent to the appropriate addressees. The pilot should try to arrange for a 'responsible person' on the ground to telephone the airborne time to the ATSU, as passing it over the RTF may, due to controller workload, lead to a delay in sending a departure message. Failure to pass the airborne time will result in the flight plan remaining inactive; consequently, this could result in the destination aerodrome not being aware that alerting action should be taken.  If there is no ATSU at the departure aerodrome, or the ATSU is not connected to the AFTN, the pilot must ensure that the departure time is passed to the Parent Unit for onward transmission.
 
DEP messages must always be sent for VFR FPLs and IFR FPLs operating outside Controlled Airspace (CAS) or outside the IFPS Zone.  A DEP message is not required if an IFR FPL has been filed with IFPS and the flight will operate solely within the IFPS Zone. 
 
Note: Failure to activate the FPL could result in the destination aerodrome not being aware that alerting action should be taken.
 
Modifications
 
Other modifications to a filed FPL, such as a change in aircraft type, speed, level, route, etc, can be notified using a change (CHG) message.  It is also important that when any changes or modifications are made to the original FPL, that a change (CHG) message is transmitted to all the addressees that will be affected by the change or modification. 
 

In the case of FPLs filed with IFPS, and as long as the CHG message is sent to them, IFPS will do this automatically for the IFR portions of the FPL.
 
Cancellations
 
Any changes to aircraft call sign, point of departure and/or destination will require the original FPL to be cancelled and a new FPL submitted. Should the flight be cancelled, for any reason, it is equally important to ensure that a cancellation (CNL) message is transmitted to all the original FPL addressees. 
 
In the case of FPLs filed with IFPS, and as long as the CNL message is sent to them, IFPS will do this automatically for the IFR portion of the FPL.
　
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本文鏈接地址：Guide to Visual Flight Rules (VFR) in the UK(39)