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Title 14: Aeronautics and Space
CHAPTER I: FEDERAL AVIATION ADMINISTRATION, DEPARTMENT OF TRANSPORTATION
SUBCHAPTER C: AIRCRAFT
PART 25: AIRWORTHINESS STANDARDS: TRANSPORT CATEGORY AIRPLANES
Subpart G: Operating Limitations and Information
: Markings and Placards
25.1553 - 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.
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