LHR SIDs

[Lost_luggage34]

Apologies - a question from the unwashed here ....

I have a very basic understanding of SIDs. i.e. Seaford, Compton, Brookmans, Dover departures etc. But can anyone tell me what the difference is between say a Dover 2G (if there is such a SID) and a 5G departure ?

Is it simply down to aircraft performance - climb rates, noise abatement, routing ? I read the ais SID plates but have yet to determine the answer - any information would be most welcome.

[BN2A]

Changes according to the departute airfield and departure runway...
LHR might have Dover 2G, 2J, 2K...
LGW might have Dover 3G, 2H...
STN might have Dover 4G, 4F...
LTN might have Dover 5C, 5D...

:cool:

etc. etc.

NB. Lists are examples and demonstrate the point and are not the actual routes used...
My memory isn't THAT good...:D

[Lost_luggage34]

Thank you BN2A - but I am talking specifically about LHR departures.

[Elevation]

Lost_luggage34

It is a usual practice, when a SID is modified it is given a higher numeric number.

i.e. DOVER 2G if modified will be named DOVER 3G. The "new" DOVER 3G SID will then have a start date from whence the old DOVER 2G will be disused.

Hope this helps.

[foghorn]

The first three (or five if an intersection) characters denote the fix at the end of the SID.

The number is incremented when the SID is modified (as Elevation says)

The final letter denotes the runway for the SID:

F EGLL 27L
G EGLL 27R
H EGLL 23
J EGLL 09R
K EGLL 09L
M EGKK 26L
P EGKK 08R
R EGSS 23
S EGSS 05

etc.

[Lost_luggage34]

Excellent - many thanks for the responses.