adj.无用的；不实用的；无益的
The surveillance radar is unserviceable. 监视雷达不工作。
To damage threads to an unserviceable condition. 螺纹损坏后不可用。
Unserviceable due to excessive wear. 由于过度磨损而不可用。
The following essential approach aid is unserviceable with R/W 31 localizer. 必要的进场设备：31号跑道航道不工作。
This applies to the transport of both serviceable and unserviceable units. 可用件和不可用件的运输也会遇到相同的问题。
