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.
Replacing the original-equipment wheels and tires can affect handling and fuel economy. The Transportation Research Board says 200 million replacement tires are purchased each year at a cost of $20 billion. You can expect to replace the tires on your vehicle every three to five years. Itâs big business. Although consumers donât typically base their decision to change their wheels and tires on fuel economy, a little research could improve mileage. Rolling resistance is the key to fuel economy.