Giga,
There are also basic Operating activities, falling generally in the category of "Tender Loving Care". TLC includes the following:
1. Starting and stopping equipment with care, per OEM instructions.
2. Flooding or Venting equipment at start, as per OEM.
3. Loading the equipment gently, ramping up as it 'warms up'.
4. Unloading equipment gently, ramping it down before stopping it.
5. Keeping equipment under steady conditions as far as possible - Tramline operations
Some of the 'maintenance' activities listed in my earlier post are usually done by Operators, but they remain maintenance acticities irrespective of who does them.
Together the two sets contribute greatly to keep relaibility at high levels.