A hard landing by a training aircraft at Oamaru Airport caused ‘‘substantial damage’’, but went unreported to authorities for a year, it has emerged. The incident, along with several others, was part of a concerning ‘‘culture problem’’ at the airport where there was a ‘‘failure’’ to report incidents, airport manager Matthew Sisson told Waitaki district councillors this week. After a propeller strike on the runway, the plane’s nose wheel detached during the ‘‘serious’’ incident about 9pm on February 13 last year. An airfield inspection the following month uncovered ‘‘unexplained runway surface damage’’, no operator accepting responsibility at the time. The hard landing was the third incident ‘‘of a similar nature involving the same operator’’ at the airport in recent years. Earlier incidents were also not reported to the Waitaki District Council at the time.…