747-400 Prnav
I have an interest in a number of 744s but am not flight deck or technical so please forgive my ignorance.
Some of these aircraft have triple IRS but no GPS installed: can they be PRNAV compliant in this configuration? Or are there different levels of PRNAV accuracy, the lower of which they might meet? The other aircraft have triple IRS and twin GPS so I assume that they will / could be compliant. All these aircraft are presently flying schedules into / out of Europe and I'd like to know whether they will continue to be able to do so or whether they will require modified nav sytems at some point?
Many thaanks
Torque