§ 171.49. Defrosters.
The requirements for defroster systems are as follows:
(1) School buses shall be equipped with defrosting and defogging devices to prevent and remove obstructions from the driver’s view; for instance, ice, snow or frost on the outside of the windshield or condensation on the inside of the windshield. Defrosting and defogging equipment shall direct a sufficient flow of heated air onto the windshield, the window to the left of the driver, the glass in the viewing area directly to the right of the driver and the glass in the service door.
(2) The defrosting system shall conform to SAE Standard J 381 and 382. See Appendix A.
(3) The defroster and defogging system shall be capable of furnishing heated outside ambient air, except that part of the system furnishing additional air to the windshield, entrance door and stepwell may be of the recirculating air type.
(4) Auxiliary fans are not to be considered as a defrosting and defogging system.
(5) Portable heater may not be used.
Authority The provisions of this § 171.49 amended under the Vehicle Code, 75 Pa.C.S. § § 4103, 4551—4553 and 6103.
Source The provisions of this § 171.49 adopted August 19, 1987, effective August 20, 1987, 17 Pa.B. 2561; readopted December 4, 1987, effective December 5, 1987, 17 Pa.B. 5052; amended September 13, 1996, effective September 14, 1996, 26 Pa.B. 4411. Immediately preceding text appears at serial pages (122792) to (122793).
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