173.220—Internal combustion engines, self-propelled vehicles, mechanical equipment containing internal combustion engines, and battery powered vehicles or equipment.

(1) The valves must be in the closed position and in the case of electrically operated valves, power to those valves must be disconnected;
(2) After closing the valves, the vehicle, equipment or machinery must be operated until it stops from lack of fuel before being loaded aboard the aircraft;
(3) In no part of the closed system shall the pressure exceed 5% of the maximum allowable working pressure of the system or 290 psig (2000 kPa), whichever is less; and
(4) There must not be any residual liquefied gas in the system, including the fuel tank.
(c) Battery-powered or installed. Batteries must be securely installed, and wet batteries must be fastened in an upright position. Batteries must be protected against a dangerous evolution of heat, short circuits, and damage to terminals in conformance with § 173.159(a) and leakage; or must be removed and packaged separately under § 173.159. Battery-powered vehicles, machinery or equipment including battery-powered wheelchairs and mobility aids are not subject to any other requirements of this subchapter except § 173.21 when transported by rail, highway or vessel.
(d) Lithium batteries. Except as provided in § 172.102, Special Provision A101 of this subchapter, vehicles, engines and machinery powered by lithium metal batteries that are transported with these batteries installed are forbidden aboard passenger-carrying aircraft. Lithium batteries contained in vehicles, engines or mechanical equipment must be securely fastened in the battery holder of the vehicle, engine or mechanical equipment and be protected in such a manner as to prevent damage and short circuits (e.g., by the use of non-conductive caps that cover the terminals entirely). Lithium batteries must be of a type that have successfully passed each test in the UN Manual of Tests and Criteria as specified in § 173.185, unless approved by the Associate Administrator. Equipment (other than vehicles, engines or mechanical equipment) containing lithium batteries, must be described as “Lithium batteries contained in equipment” and transported in accordance with § 173.185 and applicable special provisions.
(2) Are not subject to the requirements of subparts D, E and F (marking, labeling and placarding, respectively) of part 172 of this subchapter or § 172.604 of this subchapter (emergency response telephone number) for transportation by vessel or aircraft. For transportation by aircraft, the provisions of § 173.159(b)(2) as applicable, other applicable requirements of this subchapter, including shipping papers, emergency response information, notification of pilot-in-command, general packaging requirements, and the requirements specified in § 173.27 must be met. For transportation by vessel, additional exceptions are specified in § 176.905 of this subchapter.
[64 FR 10778, Mar. 5, 1999, as amended at 66 45381, Aug. 28, 2001; 68 FR 45035, July 31, 2003; 69 FR 75216, Dec. 15, 2004; 69 FR 76158, Dec. 20, 2004; 70 FR 34398, June 14, 2005; 71 FR 14603, Mar. 22, 2006; 71 FR 78632, Dec. 29, 2006; 72 FR 44950, Aug. 9, 2007; 74 FR 2259, Jan. 14, 2009; 75 FR 73, Jan. 4, 2010]