14 C.F.R. § 23.1553 Fuel quantity indicator.
Title 14 - Aeronautics and Space
A red radial line must be marked on each indicator at the calibrated zero reading, as specified in §23.1337(b)(1). [Doc. No. 27807, 61 FR 5193, Feb. 9, 1996]
Title 14: Aeronautics and Space
PART 23—AIRWORTHINESS STANDARDS: NORMAL, UTILITY, ACROBATIC, AND COMMUTER CATEGORY AIRPLANES
Subpart G—Operating Limitations and Information
Markings And Placards
§ 23.1553 Fuel quantity indicator.
