To improve system reliability, Hawaiian Electric will conduct quarterly aerial inspections of its major overhead transmission lines from Monday, Dec. 8, to Friday, Dec. 12.

The islandwide inspections will be conducted in a Manuiwa Airways helicopter from 7:30 a.m. to 4 p.m.

Exact times and routes will depend on weather conditions. In some areas, the aircraft may be required to fly low and slow which may cause temporary noise disturbances.