49 U.S.C. § 41724: Musical instruments

the instrument can be stowed safely in a suitable baggage compartment in the aircraft cabin or under a passenger seat, in accordance with the requirements for carriage of carry-on baggage or cargo established by the Administrator; and there is space for such stowage at the time the passenger boards the aircraft. the instrument is contained in a case or covered so as to avoid injury to other passengers; the weight of the instrument, including the case or covering, does not exceed 165 pounds or the applicable weight restrictions for the aircraft; the instrument can be stowed in accordance with the requirements for carriage of carry-on baggage or cargo established by the Administrator; neither the instrument nor the case contains any object not otherwise permitted to be carried in an aircraft cabin because of a law or regulation of the United States; and the passenger wishing to carry the instrument in the aircraft cabin has purchased an additional seat to accommodate the instrument. the sum of the length, width, and height measured in inches of the outside linear dimensions of the instrument (including the case) does not exceed 150 inches or the applicable size restrictions for the aircraft; the weight of the instrument does not exceed 165 pounds or the applicable weight restrictions for the aircraft; and the instrument can be stowed in accordance with the requirements for carriage of carry-on baggage or cargo established by the Administrator. Not later than 2 years after the date of enactment of this section, the Secretary shall issue final regulations to carry out subsection (a). The requirements of this section shall become effective on the date of issuance of the final regulations under subsection (b).