Built in errors!!!
Alice Springs had an approach which I think was called a"twin NDB" approach for a short time.
The chart showed it as a straight line approach using two locators and the NDB. The only one in Australia using three aids.
The problem was that the two locators were aligned with the runway, and the NDB was not. So we actually had a bent approach which was shown as straight. There was a built in 4 degree error.
This approach was almost unflyable within normal tolerances, and was quickly changed after a westwind freighter had a CFIT one night, killing three pilots.