Quote from a press report:
"As for the seeking of permission from Airbus Company, it was stated that PIA does not require any as has been intimated by the Airbus in their Communication. PIA does not need NTO (Non Technical Objection) because "it concerns a cabin configuration and not a design/standard deviation for which and NTO can apply."
The project of these seats installation in Airbus A-310 aircraft along with IFE (Internal Flight Entertainment) equipment was undertaken jointly by equipment manufactures and certified by DER/DAR (Designated Engineering Representatives/ Designated Airworthiness Representatives) from DG AC
France authorised by European Association Safety Authority (EASA). Based on certification by DER/DARI Civil Aviation Authority of Pakistan (CAA) gave approval of the project to PIA. As is the aviation certification procedure, DG AC
France on behalf of EASA will issue a Supplemental Type Certificate (STC) for these installations".
Source: Business Recorder