More info on PIA website:
Mandatory Requirements:
Seats must be approved for Boeing 777-200LR fleet.
Seat must be compliant with the latest FAR25/CS25 requirements (including 25.562) that include 16G certification and complies with RTCA DO160D for electrical items.
Seat manufacturer must be TSO/ETSO holder. The TSO/ETSO must cover whole seat structure including fire, static and dynamic tests. If any furniture is not covered in TSO/ETSO or fire, static and dynamic tests are not included in TSO/ETSO then it must be approved through FAA/EASA process and is eligible to be installed on B777-200LR aircraft.
Seats must be 180 degree flat bed.
Seat must be both electrical and mechanically operated.
All Maintenance documents including Manuals, SBs etc. Must be provided by manufacturer throughout the life cycle of seats in both digital and hard copy format.
Seat manufacturer will have to provide technical support during installation and integration test of Business class seats.
Seats must have reading light and in-arm meal trays.
Seats must have 10 year warranty support for primary structure and 05 years for secondary structure.
Manufacturer must provide spare support throughout service life of seats.
Source: PIA