Why is it that some aircraft dont have the 31,500 restriction, makes me think twice about going above 31,500 with 1 Pack inop or Bleed if the A-320 has been around for a while. Any thoughts ?
I have no idea as all the 320's I have worked on had the restriction.
That appears to be a serious error in the DDG and to have a fleet where some can and some cannot is asking for a stuff up. Is the DDG/MEL actually correct and agree with the Master MEL?
Are the aircraft just listed as serial numbers or registrations too?
As this kind of restriction is common on many aircraft I wonder your friend thought to query the lack of restriction and if so what advice was given?
Unless some S/No aircraft are fitted with kick ar$e air con packs that can do the job at higher altitudes and the aircraft can do an emerg descent in the req'd time??