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2021年9月，机队出现了一起由于前缘缝翼指示故障导致的空速低警告事件，特做相关总结和说明。

SR 3-5153093741

波音认为外表清洁度，在运行情况下，对飞机油耗的降低，几乎可以忽略不计。在刚清洗的飞机阻力大概降低0.1%，油耗大概降低0.07%-0.1%。但一投入运行，基本上就被污染了。而抛光对机体油耗的降低不产生效用。

HNA could see about a 0.1% improvement in drag for washing a dirty aircraft (of course it is a temporary benefit as it will begin getting dirty again as soon as put it back in operation).

A 0.1% improvement in drag translates into about a 0.07% – 0.1% decrease in fuel burn, depending on the distance flown.  i.e., washing produces only a very, very small improvement which may not be measurable in service.

In addition, polishing an aircraft does not reduce the fuel burn much, if at all.