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hours in service stresses
gen.	реальная наработка (Alexander Demidov); наработка (Remove and replace magnesium tail booms with more than 400 hours time in service on the effective date of this AD within 100 further hours in service. Alexander Demidov)
law	рабочие часы (для кап. ремонта и т.п. Alexander Demidov)

hours in service: 8 phrases in 5 subjects

Electrical engineering	2
Energy industry	2
General	1
Law	2
Oil / petroleum	1