14 C.F.R. § 91.603 Aural speed warning device.
Title 14 - Aeronautics and Space
No person may operate a transport category airplane in air commerce unless that airplane is equipped with an aural speed warning device that complies with §25.1303(c)(1).
Title 14: Aeronautics and Space
PART 91—GENERAL OPERATING AND FLIGHT RULES
Subpart G—Additional Equipment and Operating Requirements for Large and Transport Category Aircraft
§ 91.603 Aural speed warning device.
