View Full Version : Data Link PDC/CDL @ EGLL
Spooky 2
29th Nov 2012, 12:56
I've been looking all over the net for an example of a PDC/DCL out of EGLL, to KJFK. Specifically I cannot confirm that an altitude assignment is given in the departure SID Compton 3G. I know the SID shows the 6000' max alt until cleared by ATC, but is there a 6000' restriction in the body of the PDC/DCL text message as well or is the crew expected to aware of this, thus it is omitted.
Another 777/787 sim lesson in the making. :ok:
Gonzo
29th Nov 2012, 17:52
Off the top of my head, it only gives the crew the SID designator.
Cough
29th Nov 2012, 18:29
Gonzo is correct.
Spooky 2
3rd Dec 2012, 13:20
Thanks Gents!
When voice was used to request departure datas on the clearance delivery freq. pilots were calling for "departure clearance". Suddenly because it can be requested by data link it becomes a "pre departure clearance"....Which was for me an FAA procedure from the last century using airline hosts computers to send a minimum of datas to prepare the taxi phase during which a real departure clearance shall be obtained.
Eurocae (ED85A) and ARINC (ARINC623) have produced a set of procedures for DCL not for PDC. Unfortunately , the main provider SITA is even more inconsistent when it officially explain DCL i its adverts :
"The term “PDC” also is used to describe the US, Canadian, and Australia datalink PDC implementations. In these implementations, the PDC is sent as a ground-ground message from the tower to an airline host computer. The airline then takes responsibility for delivery of the PDC via either ACARS datalink, or, for non-ACARS equipped aircraft, through some other means such as a gate printer. The other datalink PDC implementation implemented in many locations around the world is called “DCL” for departure clearance!!!!. The DCL message itself also contains the “PDC” term.(Wrong for ED85A !) However, the delivery method is different and defined by Eurocae ED-85A which supersedes AEEC-developed ARINC 623 for the DCL application. DCL is the implementation such that the datalink dialog is directly between the pilot and the controller. The pilot requests the departure clearance via datalink. The DCL request is then routed to the tower, where, the controller then sends the clearance to the aircraft directly via datalink.
Why to make it simple when it can be done messy ...