How to Identify When Your TMA Needs Professional Repair

Not every problem shows up as a crumpled cartridge. Learn the warning signs that mean a TMA should come off the road before its next shift.

A TMA earns its keep in the seconds after a driver loses control. If it is compromised before that moment, nobody knows until it is too late. A short pre-shift walkaround catches most issues, but some damage needs a trained eye and the right shop.

Signs you can spot in the yard

• Visible deformation, cracks, or missing sections on the cartridges or blades.
• The attenuator does not lower or raise smoothly, or drifts once deployed.
• Hydraulic fluid leaks under the truck or slow, uneven movement.
• Loose, bent, or corroded mounting hardware at the frame.
• Warning lights, the arrow board, or the message board not working correctly.

When to stop guessing and call a shop

Any strike, even a minor one, is a reason for a professional inspection. Cartridges are engineered to crumple once. After that they need replacement, not straightening. The same goes for the frame. If the truck was rear-ended at low speed and the attenuator looks fine, have it checked anyway, because the load path runs through hardware you cannot see from the ground.

Can a crew fix a crumpled cartridge in the field?

No. Crash cartridges are single-use components and must be replaced with the correct parts, then the unit re-certified.

How often should a TMA be inspected?

Do a walkaround before each shift and a full professional inspection after any impact or on the schedule your maintenance program sets.