169. The following are major defects:(1) a component of the frame is broken, cracked or sags in a way that makes a mobile part and the body touch, or any other condition indicating that a side rail will very likely break down;
(2) a component of the frame that is so cracked or broken that it hampers the good working order or reduces the solidity of a steering, suspension, coupling, engine or transmission component;
(3) a crack of 37 mm or more in the vertical part of the side rail (web) or a crack of 25 mm or more in the horizontal lower part of the side rail (flange) or any crack beginning in the horizontal lower part of the side rail and extending into the vertical part;
(4) more than 25% of the locking pins that are not engaged or present in the case of the sliding bogie of a semi-trailer;
(5) a plate or a kingpin that is cracked, not securely fixed or bent to an extent that it makes coupling difficult;
(6) while the tractor truck is coupled with a semi-trailer, horizontal play exceeding 12.8 m between the kingpin and the jaws, or a kingpin that is improperly engaged or movement between a fastener of the coupling device and the frame of the tractor truck or semi-trailer;
(7) 25% or more of the locking pins that are missing or not working or lengthwise play that exceeds 9.5 mm in the locking mechanism of the slides, in the case of a sliding fifth wheel;
(8) a crack, a weld or a breach in the part of a component of the coupling device that bears a load or that is subjected to tension or sheer stress;
(9) play at the point of contact between the coupling hook and ring in excess of 9.5 mm for the hook or for the ring; and
(10) a component of the coupling device that is poorly mounted, cracked, broken, bent, missing, worn, so maladjusted that it might rupture, fall off or where more than 20% of the fasteners are missing or ineffective.