Practice question

The service door does not trigger the loading warning sequence when opened, although it opens normally. What component links the door to the warning system?

  1. The fire extinguisher bracket
  2. The heater booster pump
  3. The crossing gate hinge
  4. The service door position (loading) switch that signals the warning lamp controller

Answer: D — The service door position (loading) switch that signals the warning lamp controller

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