Sec. 27.1553 — Fuel quantity indicator.
If the unusable fuel supply for any tank exceeds one gallon, or five percent of the tank capacity, whichever is greater, a red arc must be marked on its indicator extending from the calibrated zero reading to the lowest reading obtainable in level flight.
NEXT: Sec. 27.1555 - Control markings.
PREVIOUS: Sec. 27.1551 - Oil quantity indicator.