14 CFR 137.53 - Operation over congested areas: Pilots and aircraft.
(a) General. No person may operate an aircraft over a congested area except in accordance with the pilot and aircraft rules of this section.
(b) Pilots. Each pilot in command must have at least -
(1) 25 hours of pilot-in-command flight time in the make and basic model of the aircraft, at least 10 hours of which must have been acquired within the preceding 12 calendar months; and
(2) 100 hours of flight experience as pilot in command in dispensing agricultural materials or chemicals.
(c) Aircraft. (1) Each aircraft must - (i) If it is an aircraft not specified in paragraph (c)(1)(ii) of this section, have had within the preceding 100 hours of time in service a 100-hour or annual inspection by a person authorized by part 65 or 145 of this chapter, or have been inspected under a progressive inspection system; and
(ii) If it is a large or turbine-powered multiengine civil airplane of U.S. registry, have been inspected in accordance with the applicable inspection program requirements of § 91.409 of this chapter.
(2) If other than a helicopter, it must be equipped with a device capable of jettisoning at least one-half of the aircraft's maximum authorized load of agricultural material within 45 seconds. If the aircraft is equipped with a device for releasing the tank or hopper as a unit, there must be a means to prevent inadvertent release by the pilot or other crewmember.