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| hours in operation (Typically, this type of engine is overhauled after 17000 hours in operation. Alexander Demidov); hours of operation (Alexander Demidov) | |||
| fired hours (применимо к эксплуатации турбин Tanyabomba) | |||
| working hours (В. Бузаков) | |||
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| operating hour | |||
| часы наработки: 9 phrases in 4 subjects |
| Aviation | 4 |
| Energy industry | 1 |
| Military | 1 |
| Technology | 3 |