"operational maintenance" is correct and suitable for use in written English.
You can use it to refer to the maintenance of equipment or machines in order to keep them operational. For example: "The factory supplies department must ensure that operational maintenance is carried out regularly on all machinery."
On Tuesday Transfield Services, which holds a $2bn contract for operational, maintenance and welfare services on Manus and Nauru, appeared before the Senate inquiry for its first public hearings.
By whatever means cathodic protection is applied, a small liability for operational maintenance arises, either for the continuous supply of the imposed current or for the periodic renewal of the sacrificial anodes.
The wind industry also offers opportunities in the service sector, for field technicians, installation technicians, and operational maintenance experts.
Furthermore, the proposed condition indicator can be directly employed by condition-based maintenance programs as a condition covariate for operational maintenance decision analysis.
Operational maintenance was the greatest contributor to CO2 emissions, followed by the production, construction and transportation stages.
The optimal integrated DER system is obtained by minimising an objective function that contains investment, operational, maintenance and environmental costs.
PSM includes process technology, operating procedures, operational and maintenance activities, nonroutine activities, emergency preparedness plans, and training.
"Operational and maintenance" costs increased by 34% in real terms.
Ministers said the windfarm would create 1,960 construction jobs and 580 operational and maintenance jobs.
Any surplus remaining after that and the payment of canal operational and maintenance expenses also goes to the treasury.
What the Pentagon calls "operational and maintenance" costs per active-duty warrior also grew by 34% in real terms.
