a pilot was flying a short flight from oenpelli to jabiru , northern territory .
on board the flight last year were the pilot , two adults and three children .
the pilot reported the children on board were excited and a little disruptive .
the passenger seated in the front seat coughed through the headset .
the pilot says this distracted him as he forgot to lower the landing gear .
report also found the pilot was ` relatively new ' to the cessna 310 aircraft .
there were no injuries but the aircraft was substantially damaged .