Controller Replacement in a 1928 Traction Elevator
You are a licensed elevator mechanic surveying a 1928 eight-story office building for a controller replacement. The elevator is a geared traction machine with original hoistway door locks, a car door contact, and no door lock monitoring. The owner's contractor calls the job a repair and plans to reuse all door equipment. While checking the third-floor hoistway door, you find that with the car parked 4 ft above the landing, the door can be pulled open about 3/8 in. before the lock pawl catches. The building has a current certificate and no accident history. The owner wants the controller swapped over a weekend and the elevator back in service Monday. The AHJ has not been consulted.
1. Is this work a repair or an alteration, and which code basis governs the decision?
Read the worked answer
The owner's label does not control. Replacing a controller is generally an alteration under the adopted A17.1, while A17.3 sets the baseline for existing elevators. The alteration triggers A17.1 requirements for the altered equipment and related safety interfaces, which can include door lock monitoring. Do not decide this alone on a weekend: submit the scope to the AHJ for a determination before work begins. Separately, the 3/8 in. door movement with the car away is a door-lock deficiency under the existing-elevator rules and must be corrected regardless of how the controller work is classified.
2. What door lock and monitoring work is required before the elevator can be returned?
Read the worked answer
Repair and adjust the hoistway door locks so the door cannot be opened beyond the permitted clearance when the car is away from the landing. If the controller replacement is an alteration, install door lock monitoring as required by A17.1 and verify that the car cannot start or continue to run with a door unlocked. Test every landing, including the third floor, and confirm that the monitoring circuit stops the car and prevents motion. Document the measurements and test results. Do not rely on the old car door contact alone as a substitute for proper lock monitoring.
3. How should you handle the owner's demand for a Monday return to service?
Read the worked answer
Tell the owner in writing that the weekend schedule cannot be guaranteed until the AHJ determines the alteration scope and any required permit and inspection are arranged. Explain that returning the car with a known door-lock deficiency exposes the owner and mechanic to liability and is not permitted. Offer a realistic schedule that includes lock repair, monitoring installation if required, testing, and inspection. Do not sign a certificate or place the car in service before the required work is complete and accepted.