United Technical Operations is the maintenance, repair and overhaul division of United Airlines. We bring over 85 years of MRO experience, employee talent and operational integrity to our customers. As a full-service global MRO provider, our specialized areas include engines, line maintenance, global emergency maintenance (GEM), landing gear, component maintenance, composites and sheet metal, and engineering services. The San Francisco Maintenance Base engine shop is ISO AS9100 approved and we continue to be certified through successful surveillance and compliance. United is also proud to support several government programs that encompass a variety of services from our product portfolio.