Keeping a TMA Ready: A Maintenance Baseline

A crash truck only protects your crew if it deploys correctly and stays MASH-compliant. Here is a practical baseline for keeping units ready and legal.

An attenuator that hangs up on deployment or has a compromised structure is a false sense of security. Maintenance on a TMA is not about looks. It is about making sure the unit does its one job when a vehicle comes in at speed. Build a routine and stick to it.

Regular checks

• Cycle the deployment mechanism and confirm it moves from travel to protect in about 20 seconds without binding.
• Inspect the energy-absorption structure for cracks, corrosion, or prior impact damage.
• Verify arrow board lamps, controls, and wiring; a dark board is a safety gap.
• Check mounting hardware and hydraulic or actuator components for wear and leaks.
• Confirm the truck still meets the roughly 26,000 lb GVWR target after any equipment changes.

After an impact

A unit that has taken a hit is not a judgment call. It needs inspection and, in most cases, repair and MASH re-certification before it goes back to work. Skipping that step means the next impact meets a weakened structure. Document the event and get the unit evaluated by a service provider who can re-certify it.