Fleet and Vehicle Maintenance
What this domain tests
Fleet and Vehicle Maintenance tests preventive maintenance (PM), defect and work-order control, fleet availability and reliability, parts and warranty management, and maintenance records. Scenario items often ask what to do first when a defect or repeat failure appears.
Core rules and concepts
- PM intervals follow OEM requirements plus agency policy, triggered by miles, time, or engine hours, whichever comes first.
- A work order should record complaint, cause, correction, parts, labor, and status. Repeat repairs need root-cause review.
- Fleet availability = available vehicles ÷ total fleet. Reliability is better measured by mean distance between failures (MDBF) or road calls per 100,000 miles.
- Safety defects ground a vehicle until repaired; deferrals require documented approval and a deadline.
- Warranty recovery and parts min/max levels protect both cost and uptime.
Worked example
A fleet has 150 buses. Twelve are in PM, four await parts, and two are at the body shop. Available = 150 − 18 = 132, so availability = 88%. The target is 90%, which requires 135 available. The agency is short three buses. Reasoning: PM units are not available for service, so they cannot be counted. The fix may be moving PM to off-peak, expediting parts, or adjusting the spare ratio.
Traps that cost marks
Counting units in PM as available; confusing PM completion with PM compliance; treating a repeat road call as a one-off; and approving a deferral without a safety review or follow-up date.