Papua New Guinea's national airline, Air Niugini, has had to pull two Fokker-100 aircraft off the Port Moresby to Cairns passenger run after failing to install new ground proximity warning systems.
Australia's Civil Aviation Authority (CAA) banned the planes when the airline failed to meet a July deadline for fitting the equipment despite being given five years' notice of the new requirement.
Air Niugini corporate affairs manager Eva Arni says other Fokker-100 aircraft which carried the equipment had been leased for the Cairns run and there had been no disruption to the service.
She says the airline would install the warning systems in its own Fokkers.
