Reducing Operating Cost.

Reporting Elevator Problems - Leveling
It is possible to minimize downtime and lower operating cost of your vertical equipment by accurately reporting problems when they do occur.
One of the most important and least expensive things an elevator owner can do to reduce costs and improve service from the service vendor is striving to accurately report elevator problems.
A common and arguably the most misreported trouble call concerning elevators are about the floor heights between the outer landing and the elevator cab not being level. It's not so much the fact that the elevator is not within the design parameters of its manufacturer; it's the amount of the difference in level that's reported that adds a degree of difficulty to the responding technician. Accurate information is vital when reporting troubles to the vendor. Think of describing a car problem to a mechanic as "I hear a noise somewhere, sometimes, but not all of the time and maybe not the same noise". Huh?
When I was a service mechanic and later a service manager, one of the most difficult tasks was getting accurate and usable information about a problem being reported. In the workings of an elevator there is huge difference in a .250" and 1" of floor level accuracy. When giving scrutiny to the problem which may be occurring intermittent as well, the logical approach taken to find the cause and resultant corrective action is two very different paths depending on what measurement was used. The old adage of; "Bad info in, bad info out" applies here. Both areas of cause and effect are time consuming and be aware that somewhere, whether it's stated or not, a time clock is running for the technician to resolve the issue and move on.
So the average technician will explore the most obvious fact known: people not involved in the elevator industry most likely are erring when reporting floor level problems.
To determine what the manufacturer of your elevator uses for level tolerance; request that in writing from your service provider so you have a standard to compare any unlevel problem you may note.
Our practical real world experience tells us that a modern elevator in a well maintained condition will consistently stop and hold within 1/16" to 1/8". That does not imply that all elevators will meet that number, in-fact that's far from it. Americans with Disabilities Act (ADA) compliance does not require that degree of accuracy, nor does applicable code. ADA and The Florida accessibility code requires .500" (1/2") for floor accuracy.

How to Determine the Stopping Accuracy
The best method used to determine the level condition of an elevator by the owner/manager is to obtain a short length straightedge, six inches (6") in length is more than enough, and with the doors fully open, place the edge across the opening on the higher of the two sills; and across to the opposite sill. Then with an accurate rule or gauge, measure the distance from one to another. Record that difference in heights and move to another floor and repeat that process until enough information is gathered to determine the extent of the problem. Report those finding when placing the service call and again when the technician responds. This serves a greater purpose than just getting the problem resolved; it demonstrates to the technician that you care about accuracy of the information and have that working knowledge of the leveling tolerances. Both lend towards a quick and absolute resolve of any problems, reduce downtime due to investigating the extent of any leveling issue, and also can reduce your liability in that you've demonstrated a proactive approach to possible elevator issues. All of that equals less operating costs