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].
If rain and wet roads are a concern, you should consider replacing your tires when they reach approximately 4/32 of remaining tread depth. Since water can't be compressed, you need enough tread depth to allow it to escape through the tire's grooves.f two of your tires have a lot of remaining tread depth, but you need to replace the other two because they were damaged or have worn out, you should replace them with a pair of tires that come as close as possible to matching your existing tires.
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.