Decals with usable fuel amount next to filler caps
Question. A few years back there was an airworthiness requirement that next to the fuel filler caps on general aviation aircraft, the usable fuel amount in litres was written on a decal. This was a quite important safety measure where aircraft such as the Cessna 172 and Cessna 152 could have standard size fuel tanks or so-called long range fuel tanks.
Is that airworthiness requirement still current?