Exhaust gases entering the vehicle's cabin due to an exhaust-system leak constitutes which sort of defect?
- None
- Minor
- Trivial
- Major ✓
Answer: D. Major
Exhaust gases getting into the cab from a leaking exhaust system is a major defect, so the truck must not be driven until it is repaired.
Why this is the answer
The handbook explains that the inspection schedule splits defects into just two groups, major and minor. A minor defect gets recorded on the report and passed on to the operator. With a major defect, the rule is different: the vehicle cannot be driven at all, and major defects have to be repaired before the truck goes back out. The same handbook lists leaking exhaust systems among the causes of vehicle fires, so exhaust fumes escaping into the cab are treated as a serious safety defect rather than a small one.
Why the other answers are wrong
- A. None — Only two categories exist in the schedule, major and minor, so a defect cannot be classed as none once a leak is present.
- B. Minor — A minor defect is one you record on the report and report to the operator, and an exhaust leak that lets gases into the cab is handled as a defect that stops the truck from being driven.
- C. Trivial — Trivial is not one of the defect categories the inspection schedule uses, and a leaking exhaust system is listed as a fire risk, not something to shrug off.
Remember it
Think of it as a two-box form: major or minor. If it can start a fire or put fumes in the cab, it belongs in the box that keeps the truck parked.