Help needed with ACN vs. PCN
Now I know that ACN has to be less than PCN, so long as tyre pressure is at or below limit of runway, you're good to go. My question is around the B777-300ER and B777F...
Both have a standard tyre pressure of 221 psi, yet many of the airports it operates into/out of have a PCN containing the restriction of 217 psi (or X - medium tyre pressure category).
Im a little confused...
So how is this allowed? Is this just a recommendation? Do the aircraft operators have to lower tyre pressures? Do the aircraft operators have to have prior agreement with airport operator?
Any help would be awesome, thanks
