Instrument landing system ( ils ) a standard icao precision landing aid to provide accurate azimuth and descent guidance signals for use by aircraft for landing on the runway under adverse weather conditions 这是国际民航组织指定的标准精确著陆导向设备，提供准确的方向指示及下降指引讯号，即使在恶劣的天气状况下，航机亦能安全地在跑道上降落。
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An ils is a standard international civil aviation organisation ( icao ) precision landing aid provides accurate azimuth and descent guidance signals for use by aircraft for landing on the runway even under adverse weather conditions 这是国际民航组织指定的标准精确著陆导向设备，提供准确的方向指示及下降指引讯号，令航机即使在恶劣的天气状况下，亦能安全地在跑道上降落。
