Apparatus Model Year?

[x635 4,066]

When an apparatus is built partially in 2006, and completed in 2007, what is the delivery year?

Is it based on the year of the chasis, body completion, or what?

[AndyC3J 190]

In most cases, it seems to go by the year of the chassis.

I've wondered a lot (and asked a few times) about this as well, and have never really gotten a straight answer. With cars, there seems to be a cut-off point in mid year where it becomes the following model year, but fire trucks don't seem to work the same way.

Most places go by the chassis manufacture date, others by when it was delivered. Some probably still go by which half of the year it was started in, or when they ordered it. Who knows?