Will 393.207D put my truck out of service?
Yes—there's a strong chance. Across our inspection records, 393.207D resulted in an out-of-service placement 69.2% of the time (9 out of 13 all-time citations). That's more than double the 31.4% average OOS rate across all FMCSR codes. If you've been cited, assume your truck will be pulled from service until the cracked or broken coil spring is repaired and re-inspected.