220.127.116.11 Restricted Opening of Car Doors
(1) An alternate power source shall be provided that shall permit the means to operate for not less than 1 h upon loss of normal power.
(2) The alternate power source shall be
(-a) monitored, and when it is detected that there is insufficient capacity to operate the means for not less than 1 h, an audible signal conforming to (d) shall operate
(-b) provided with readily visible information that indicates the expiration date of the alternate power source in lettering not less than 5 mm (0.25 in.) high
(c) On automatic operation, the portion of the means dependent on power shall be monitored, and when it is detected that it has failed to operate in accordance with 18.104.22.168.1, an audible signal conforming to (d) shall operate.
(d) The audible signal required by (b)(2)(-a) or (c) shall be at least 10 dBA above ambient, not exceeding 80 dBA, measured inside the car.
(b) 1000 N (225 lbf) applied over a period of 300 s with the force increasing incrementally, applied in the opening direction of the door at a location as near to the restricting means as possible, but not to exceed 300 mm (12 in.)