Ask about one actual work decision
Begin with: “What would you check before replacing a component because of a fault code?” Ask what evidence the person had, what they checked, who authorized the work and how they knew the result was acceptable. The same question can reveal disciplined process at different experience levels.
Probe an ambiguous situation
Give an ordinary scenario such as fleet PM inspection finding a developing leak. Ask what information they would gather before changing anything. Reward candidates who identify missing facts and boundaries. Do not turn the interview into a test of dangerous improvisation or ask them to describe bypassing safeguards.
Separate tasks from titles
Someone who has worked around fleet preventive maintenance may not have led a project involving mobile service in a yard or customer location. Ask which specific tasks they performed personally, which they assisted and which they have only seen. In a hiring process, clear limits are useful information, not grounds for embarrassment.
Check documentation and communication
Ask them to explain how they would record a handoff after intermittent no-start on a cold morning. Could the next shift understand what happened? Would a customer or inspector understand the result? This helps distinguish candidates who complete work from candidates who can make the work verifiable.
Finish with mutual clarity
Tell candidates the actual shift, travel demands, supervision and tools supplied. Road-call duty, rotating shifts and tool ownership can materially change a compensation package. Use the same essential questions for every comparable applicant, document role-related reasons for decisions and avoid asking for protected personal details.