貝爾直升機(jī)商業(yè)技術(shù)出版物 Commercial Technical Publications
時(shí)間：2012-10-28 10:52來源：藍(lán)天飛行翻譯 作者：航空 點(diǎn)擊：次
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Information Letters can be issued against a specific model of helicopter and General Information Letters (IL GEN) are issued against the entire fleet of helicopters. |
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