FMCSR 393.207C: Leaf Spring Assembly Defects—Q&A

Yes—57.5% of the time. Across our 13 million inspection records, when drivers are cited for leaf spring assembly defects or missing components under 393.207C, inspectors place the vehicle out of service in 1,006 cases out of 1,751 total citations all-time. That's significantly higher than the 31.4% average OOS rate across all FMCSR codes. Whether you get pulled from service depends on how severe the inspector judges the defect, but the odds are better than even that you'll be sidelined for repair before you can move.

Texas, North Carolina, and New Mexico lead enforcement. Our records show Texas issued 466 citations in the last 180 days (57.3% OOS rate), followed by North Carolina with 16 citations but an 81.3% OOS rate—the highest among top-cited states. New Mexico had 21 citations at 57.1% OOS. If you're running freight in TX or the Southwest, leaf spring assembly condition is under closer scrutiny.

Immediate steps:

1. Do not move the truck if OOS. Operate on the highway and you face federal penalties on top of the citation.
2. Document the defect. Take photos of the cited leaf spring assembly from multiple angles and note inspector name/badge and inspection location.
3. Schedule repair immediately. Over the last 90 days, 75 drivers cited for leaf spring defects were also cited for inoperable lamps (393.9) in the same inspection, and 40 had slack adjuster issues (393.47E)—this suggests systemic undermaintenance. Get a full frame and suspension inspection.
4. Keep repair receipts. You may need them for DataQs or insurance claim.

Yes, it's in the upper tier of severity. The 57.5% OOS rate for 393.207C is far higher than similar suspension and component codes: inoperable lamps (393.9) sit at 6.9% OOS, windshield defects (393.78) at 0.3%, and slack adjusters (393.47E) at 0.0%. Even the general maintenance inspection code (396.3A1) averages 45.3% OOS. Leaf springs are structural safety components, so inspectors treat defects as immediately hazardous to stability and control.

DataQs challenges work best for documentation errors or inspection procedure violations—for example, if the inspector didn't actually observe the defect or failed to measure slack adjuster clearance per protocol. For a physical defect like a missing or cracked leaf spring, contestation is harder because the defect is tangible and observable. If you believe the citation was issued in error (wrong vehicle, misidentified component), file through FMCSA's DataQs portal with your photographic evidence and the inspection report number. Response time is typically 30 days.

Enforcement has remained steady but elevated. Our data shows 1,104 citations issued in the last 12 months, compared to 1,751 all-time. The monthly trend since May 2025 has fluctuated between 76 and 125 citations, with peaks in October (125) and February (107). This suggests leaf spring defects are a consistent enforcement priority, not a seasonal spike. If you're managing a fleet, treat suspension maintenance as a year-round compliance focus.

Freightliner (FRHT) units account for 509 of all 393.207C citations in our database—29% of the total. Kenworth (KW) follows with 256, and Peterbilt (PTRB) with 243. These are the most common heavy-duty tractors on the road, so citation frequency tracks volume, but the data suggests no make is immune. If you're operating an older or higher-mileage unit, the wear-and-tear risk is cumulative—have leaf springs inspected at every PM cycle.

Very urgent. In the last 90 days alone, inspectors cited 249 drivers for leaf spring defects, an average of 2.7 per day. More critically, 57.5% face immediate out-of-service, meaning repair cannot wait for your next scheduled maintenance window. Leaf springs are load-bearing components that affect braking distance, steering response, and cargo stability. Operating on a defective or missing leaf spring—even to a repair shop—is illegal and dramatically increases accident risk. Schedule repair the same day you receive the citation.