Air New Zealand subsidiary Eagle Air has been cleared of any wrongdoing after an aircraft it was operating was forced to belly-land in Blenheim in 2007.
The Beechcraft 1900-D was on a flight from Timaru to Wellington when its landing gear failed on approach to Wellington Airport.
The aircraft then flew to the Woodbourne Aerodrome in Blenheim to perform an emergency landing. No one was injured.
The Transport Accident Investigation Commission says a fatigue crack in an actuator allowed hydraulic fluid to leak overboard, which caused the landing gear to fail.
The commission says the aircraft was properly maintained and since Eagle Air quickly remedied the fault, no further safety recommendations are necessary.