An Air Chathams flight bound for Whanganui from Auckland had to make an emergency landing at Hamilton Airport on Monday due to an electrical fault.
The fault caused a detector to register heating in the rear cargo area of the Saab 340.
The aircraft and its 31 passengers were not able to continue to Whanganui until the aircraft had been inspected by engineers who had to travel from Auckland.
Air Chathams chief executive Craig Emeny said it caused a four to five-hour delay before the aircraft was approved to resume the flight.
Emeny said it wasn't a fault the airline had previously encountered.