on-condition maintenance

on-condition maintenance

[¦ȯn kən¦dish·ən ′mānt·ən·əns]
(industrial engineering)
Examination of those aspects of an installation that are predictive of pending failure, followed by performance of preventative maintenance activities before occurrence of total failure.

on-condition maintenance

Maintenance of machinery when condition monitoring equipment indicates that a mechanical failure is about to occur.

on-condition maintenance

A type of aircraft maintenance in which parts are replaced only when their condition appears no longer airworthy, instead of at predetermined intervals of operation.
References in classic literature ?
He glanced unhappily at one of the pictures on the wall.
It was a gloomy Sunday afternoon when the book came under my hand; and mixed with my interest in the story was an anxiety lest the pictures on the walls should leave their nails and come and lay themselves at my feet; that was what the pictures had been doing in Rochester and other places where the disembodied spirits were beginning to make themselves felt.
But I have also seen his eyes rest fondly upon the faces in the room, upon the pictures on the wall, upon all the familiar objects of that home, whose abiding and clear image must have flashed often on his memory in times of stress and anxiety at sea.
The parlour, the back parlour, and the dining-room were warm and brightly lighted, with comfortable chairs and sofas, and gay pictures on the walls.
In the largest there were pictures on the walls, portraits and landscapes of little interest.
There were no drapery curtains at the dormer windows, no pictures on the wall.
Hayward led them into a large, long room, dingily magnificent, with huge pictures on the walls of nude women: they were vast allegories of the school of Haydon; but smoke, gas, and the London atmosphere had given them a richness which made them look like old masters.
You're like the pictures on the walls of a deserted house: `The Portrait of a Gentleman.
There were no pictures on the walls but here and there boughs laden with heavy-petalled flowers spread widely against them.
For instance, the pictures on the wall next the fire seemed to be all alive, and the very clock on the chimney-piece (you know you can only see the back of it in the Looking-glass) had got the face of a little old man, and grinned at her.
And Valentin began to walk away slowly, looking vaguely at the pictures on the walls, with a thoughtful illumination in his eye.
It was not a child's room, but a grown-up person's room, with gloomy old pictures on the walls and heavy old oak chairs.