During 1964, the pre-production aircraft of 103mo "Gruppo" were replaced by production standard G.91 R/1 combat aircraft; thus 16 of the pre-production aircraft were converted for service with the Italian aerobatic team, the "Frecce Tricolori"; these conversions, which had their armament removed and other modifications such as the addition of pitch dampers, ballast, and smoke tanks beneath the wings, were designated as the "G.91 PAN". The G.91 PAN reportedly accumulated roughly 1,500 flight hours per year, and had an average efficiency in excess of 90 per cent.