(a) The entity shall establish a system of regular and frequent maintenance checks of lifts sufficient to determine if they are operative.

(b) The entity shall ensure that vehicle operators report to the entity, by the most immediate means available, any failure of a lift to operate in service.

(c) Except as provided in paragraph (d) of this section, when a lift is discovered to be inoperative, the entity shall take the vehicle out of service before the beginning of the vehicle's next trip and ensure that the lift is repaired before the vehicle returns to service.

(d) If there is no other vehicle available to take the place of an OTRB with an inoperable lift, such that taking the vehicle out of service before its next trip will reduce the transportation service the entity is able to provide, the entity may keep the vehicle in service with an inoperable lift for no more than five days from the day on which the lift is discovered to be inoperative.