Is this image showing 18.5 liters or quart of engine oil?
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1 Answer
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The answer is actually in the image: Below "OIL", it says "QT", which according to the "Abbreviations" table under "General Information" in the A320 FCOM, means
Quart (US)
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$\begingroup$ Probably they use this unit because as it is close to liter (0.94), they don't have to change anything for the european market, except the label. $\endgroup$– LegiseySep 26, 2018 at 13:12
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2$\begingroup$ @Legisey I think the European market also uses quarts, not liters. It wouldn't make sense for a European made plane which is used by airlines around the globe and potentially flies intercontinental with pilots from all over the globe to have separate displays for different markets, especially in the risky manner you describe where they only replace the unit but don't redo the calculations. $\endgroup$– NzallSep 26, 2018 at 13:31
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4$\begingroup$ A bigger question is why do they use US Quarts for oil? Or more broadly how have we ended up with such a mix of US and metric units (and possibly imperial for all I know). I was going to ask but it's too close to Why doesn't the aviation industry use SI units?, thoughg the accepted answer there states Non-SI is only used for altitude, distance and speed except in US and some other American countries. which doesn't seem to be the case here $\endgroup$– Chris HSep 26, 2018 at 13:59
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$\begingroup$ Yes. The capacity of tank for overflow oil is 20.1 quart. And why i uplift full oil, it only show 18.5. There are logical about it? $\endgroup$ Sep 26, 2018 at 14:26
OILand right below it it saysQT. Probably more obvious to an American who is used to this archaic unit of measure, but theF. USEDlabel is also identified inKGright above it... $\endgroup$