FMCSR 393.71K-CDLSC: Fifth Wheel Defects – Driver Q&A

Yes, almost certainly. Across our inspection database, trucks cited for 393.71K-CDLSC have been placed out of service at a 100.0% rate — all 2 citations in our records resulted in OOS placement. For context, the national average OOS rate across all FMCSR codes is 31.4%, so this violation triggers roadside enforcement far more often than typical maintenance citations. Expect your truck to be parked until the fifth wheel assembly is repaired and re-inspected.

This violation carries a CSA severity weight of 8 points. The weight gets multiplied by the number of violations within a 30-day period — so a single citation adds 8 points to your carrier's safety record in the Roadside Safety BASIC. Multiple citations in the same month compound quickly. Even one citation meaningfully impacts both your personal record and your fleet's SMS score.

Immediate steps:

1. Do not operate the vehicle — your truck is now OOS and must be repaired before moving.
2. Inspect the fifth wheel assembly for loose bolts, cracks, excessive movement, or wear.
3. Check related systems — our data shows this citation frequently co-occurs with frame damage (393.201A/B), lighting defects (393.11A1), and brake issues (393.43A). Have a certified mechanic inspect all of these.
4. Document repairs with photos and receipts.
5. Request a Level I re-inspection at the same location or next inspection point before resuming operations.

Yes. Your 100.0% OOS rate is dramatically higher than similar vehicle maintenance violations. Compare: inoperable lamps (393.9) average 6.9–15.4% OOS, frame defects (393.201) are not typically OOS-eligible, and windshield defects (393.78) trigger OOS only 0.3% of the time. Fifth wheel defects represent a critical safety failure — the coupling that anchors your entire trailer. Inspectors treat this as a non-negotiable roadside stop.

You can submit a DataQs (Roadside Data Quality Program) request if you believe the citation was issued in error — for example, if the inspector cited you for a defect that did not exist, or if documentation of repairs was overlooked. However, fifth wheel condition is an equipment-based finding (not paperwork), so contestation is harder if the defect was genuinely present. Focus instead on rapid repair and requesting an expedited re-inspection to clear the violation. Consult your carrier's safety manager to file DataQs if you have photographic evidence the truck was compliant.

Our inspection records show only 1 citation in Pennsylvania over the last 180 days, and 2 total citations ever in our database — making this an exceptionally rare violation. It ranks #2,651 out of 3,036 FMCSR codes by enforcement volume. This rarity makes it harder to predict where you'll encounter enforcement, but it also means if you're cited, the defect is severe enough to warrant immediate attention rather than a routine maintenance issue.

Immediate. Do not delay. Your truck is already parked at the scale or inspection site. The 100.0% OOS enforcement rate means you cannot operate legally until repairs are complete and verified. Fifth wheel integrity is load-critical — failure during transit risks jackknife, rollovers, or cargo loss. Our inspection data shows 2 citations in the last 12 months and 1 in the last 90 days, indicating steady enforcement whenever defects are detected. Hire a certified mechanic today and schedule a Level I re-inspection as soon as repairs are finished.

This violation records against both the driver and the carrier. Your personal MVR includes the citation, and your carrier's DOT file includes it under the Roadside Safety BASIC. For drivers, accumulation affects insurability and employment. For carriers, it contributes to CSA crash risk assessment and may trigger audits or compliance reviews if patterns emerge. Ensure your carrier documents the repair and files any DataQs appeal on record to mitigate fleet-level impact.