Sir John, now you can tell him what is a hard landing officially.
An FO friend said me, that a "rule" issued by airlines (here Pegasus) tell that that landings should not exceed 1.65G, (1.65x the aircraft weight which acted on aircraft tyres at the instant of touchdown) or it can be considered as a hard landing (high sink rate generally) and the aircraft can be grounded for inspection.
And for Sir John who like to talk officially, Boeing say that the aircraft can safely handle up to 2.5G landings, but the limit due to rule is 1.65. (Called VAC).