4. Routine maintenance, inspection and operational testing of the emergency generator and associated. components must be overseen by a properly trained person [see MSFC(07), Sec. 604.5; NFPA. 99(99), Sec. 3-4.4.1.1(b)3; NFPA 110(99), Sec. 6-4.7; NFPA 110(02), Sec. 8.4.7].
Replace the tires at least every 6 years. If you're not sure, the minimum replacement time that is recommended by the NHTSA is six years regardless of use, with 10 years being the maximum service life for tires. Check your owner's manual for specific recommendations related to your car.s the tires wear, these bars will become flush (level or even) with the tire's tread. At this point, it's time to replace the tires. 3. Check the tread by using the penny test.  Take a penny, and place it upside down with Lincoln facing you in the center of the tread (at the thickest part of the tire).
Car companies and tire companies have sent bulletins to dealers saying that tires older than six to ten years should be replaced. WATCH a video on how to tell the age of your tires. Fortunately, you don't have to depend on a professional to determine the age of your tires.The answer is right in front of you, written on the side of the tire itself. Every tire has a Tire Identification Number -- a serial number -- inscribed on its sidewall.On tires manufactured after 2006, the number is written on the sidewall that faces out and is easily visible.n fact, as all tires age they become more prone to losing their tread suddenly and causing an accident. According to the National Highway Traffic Safety Administration (NHTSA), when tires are older than six years, the chances of a sudden tread separation start to climb.