(The following admonition is published as received from the Associate Airframe and Services Manager in the Wichita Aircraft Certification Office. Specific models included are: 150, 152, 172, R172, 177, 180, 182, 185, 206, and 207.)

“Cessna airplanes fitted with wheel fairings incorporate a scraper adjacent to the tire. Damage will result if the correct clearance is not set between the tire and scraper. You should check the clearance when the scraper is disturbed, when the tire is changed and when speed fairings are installed. Adjust the clearance to have a minimum of 0.55 inch (14 mm) to a maximum of 0.80 inch (20 mm). The clearance allows for tire growth due to rotational speed and aging. Although tread wears off the tire with use, age growth increases the tire size faster than wear decreases it. Low tire pressure may change the rolling shape of the tire, which can cause tire-to-scraper interference as well, so maintaining proper tire pressures is also important. Cessna has recently revised the 172R/172S, 182S/182T/T182T and 206H/T206H maintenance manuals to incorporate this clearance information.

It will be included in older manuals as they are revised.”