Four Findings, One Bus, Forty Minutes to Departure
Tuesday, 05:20, -8 °C, light snow falling. You are assigned unit 214, a 40-foot transit-style bus plated for 47 passengers, on a 06:00 charter with 42 people booked and a 300 km route that includes two highway passes. The only spare is a 30-foot bus that has sat unused for three weeks. The shop mechanic does not start until 07:30. Your walk-around turns up four things: the left rear turn signal does not flash; the right front tire has a 40 mm cut in the sidewall with fabric cord visible; the right rear slack adjuster pushrod measures 57 mm on a type 30 chamber marked with a 51 mm limit; and the washer fluid reservoir is empty with slush spray already building on the windshield.
1. Classify each of the four findings and state whether unit 214 can leave the yard.
Read the worked answer
Turn signal, left rear - out of service. Every required lamp must function. You cannot hand-signal from a bus, and an un-signalled lane change in snow is a foreseeable collision.
Tire sidewall cut with cord visible - out of service. Cord means the structural plies are damaged. No repair exists; the tire comes off. A blowout on the front of a loaded bus at highway speed is a loss-of-control event.
Pushrod at 57 mm against a 51 mm limit - out of service. Past the limit, the chamber runs out of travel before full braking force reaches the shoe. Stopping distance grows and release can drag.
Washer fluid empty - not trip-stopping on its own, but in slush it is a visibility defect. Fill it; if the washer or wipers then fail to work, the bus still does not go.
Verdict: three mechanical defects, so 214 stays put. The classification matters more than the count - two of these degrade stopping, which is where the consequences are worst.
2. Dispatch says to take the old 30-foot spare, or 'just take 214 and get going, the group is already here.' What do you say, and what do you do in the next 20 minutes?
Read the worked answer
You decline to move 214. This is not a negotiation about inconvenience; it is a question of whether the vehicle is fit. Defects affecting brakes, tires or required lighting are not yours to waive, and a dispatcher's instruction is not authority to drive an unserviceable bus.
Next 20 minutes:
- Secure 214 and tag or note the defects so nobody else dispatches it by mistake.
- Notify dispatch in writing - text or radio log - listing exactly what failed. That record protects you and the passengers.
- Inspect the spare completely. A bus idle for three weeks may have low tires, a weak battery, or its own air leaks. Treat it as unknown.
- Start it, build air to governor cut-out, and run the full pre-trip and air brake tests before anyone boards.
- Give the group a realistic departure time. Twenty minutes late is cheaper than a breakdown on a pass.
If no serviceable bus exists, the trip is delayed or cancelled. The carrier makes that call, but the fitness judgement is yours.
3. What must be recorded about these findings, and who is permitted to return unit 214 to service?
Read the worked answer
Record all four findings on the daily trip inspection report: unit number and plate, date, odometer, each defect in plain language, your name, signature and the time. Note that the bus was removed from service and that dispatch was notified.
The carrier then reviews the report, arranges the repair, and records the corrective action. Only a qualified mechanic clears a safety defect - you cannot clear your own finding, and you should not sign off a repair as complete unless you personally verified it (lamp flashes, stroke re-measured within limit, new tire fitted).
If you are later assigned 214, re-check those specific items yourself. A signature on a repair sheet is evidence, not inspection.
The report belongs in the carrier's National Safety Code maintenance file and is kept for the period set by the company's NSC program and the Commercial Transport Act regulations. If you do not know where those records live, find out before you need them.