The bridge has required extensive preventive maintenance to mitigate deterioration due to the location's salt air.

A T2 hangar was also used for more extensive maintenance and repair.

El Cajón also developed costly structural problems requiring extensive maintenance and repairs.

While the power tops on these did not necessarily need extensive maintenance, they could be operated manually if necessary.

They also performed extensive maintenance and repair work on the damaged hatch of the Kvant-2-module.

Pulsed systems are typically expensive and require extensive maintenance.

He was notoriously hard on his guitars, and many of them required extensive periodic maintenance.

In all, the plane needed about 50 changes, plus extensive routine maintenance.

A commercially registered plane may require more frequent or more extensive maintenance.

Overstressed by growing outside their natural environment, they require extensive maintenance to adapt to conditions that are less than ideal.