A320 PERF Q.
Airbus runway charts will show the code or codes for the weight limiting reason .
Why do they repeat the same number twice ,
example 6-6 for brake energy ?
Sometimes there is only one number there like code 2
It's common to see two different ones like 2-3 .
Do they just list them in a correlative order when two resticting codes apply or do they list the numbers being the first one the more closer restrictive one.
When do they list only one ?
Like only 2 for second segment, by how many pounds margin for example do the omit the second number or even like in some cases not show any restricting code at all ?