In an Out-and-Back/Cross-Country scenario, what is the unacceptable visibility of cords on the main gear tire?

In an Out-and-Back or Cross-Country scenario, the visibility of any cords on the main gear tire is considered unacceptable because it indicates that the tire may be significantly worn or damaged. Tires are designed to provide traction, stability, and safe maneuverability during flight, and the appearance of cords compromises these essential functions.

When cords are visible, it signals that the tire tread has been extensively worn down, reducing its effectiveness and increasing the risk of blowouts or loss of traction during landing and takeoff. This presents a potential safety hazard and may violate operational standards for aircraft maintenance and inspection.

Others options, while they may seem less severe, do not address the fact that any visible cords indicate a level of wear that is beyond acceptable safety limits for flight operation. Therefore, even a single cord compromise the integrity and reliability of the tire, necessitating immediate inspection and possible replacement to ensure safe operation of the aircraft.