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During the inspection of a double or triple set, what additional checks are required beyond a single trailer inspection?
- A.Only the rear trailer needs inspection in a set
- B.Sets are inspected the same as singles with no additions
- C.Every extra coupling point (fifth wheels, pintle/drawbar, dolly), the extra sets of air and electrical connections, and the shutoff valves and safety chains between units
- D.The dolly and its connections are the carrier's problem, not the driver's
Correct answer
C. Every extra coupling point (fifth wheels, pintle/drawbar, dolly), the extra sets of air and electrical connections, and the shutoff valves and safety chains between units
Why
Each added unit adds couplings and connections that can fail, so the inspection grows with the set. A systematic front-to-back walk keeps any of those extra points from being skipped.
Manual topic: Combination Vehicles - Doubles and Triples · From the Combination Vehicles practice bank (CV-227).