TDZE

AcronymDefinition
TDZETouchdown Zone Elevation
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References in periodicals archive ?
* Approach light system (except you may not descend below 100 feet above TDZE unless the red terminating bars or red side row bars also are distinctly visible and identifiable).
If the approach has a MALSR or similar set of lights, there aren't any red lights and that whole 100 feet above TDZE doesn't even apply.
The GS intercept is a further-than-normal 7.9 nm from the runway, and has a 4.2-degree slope going down to 1368 feet, more than 1100 feet above the TDZE. Add the three-mile visibility requirement and this procedure is well in the realm of non-precision, nonaligned approaches.
You reach the MDH of 565 feet (TDZE is 435 feet) about two statute miles from the runway.
Per FAR 91.175 you can descend below MDA with only part of the approach lights but not below 100 feet above TDZE. You also need the required visibility to be down this low, but you could fly this by the LNAV minimums and you'd only need 3/4 of a mile.
This change mandated replacing the term Height Above Touchdown (HAT) with Height Above Threshold (HATh), and replacing Touchdown Zone Elevation (TDZE) with Threshold Elevation (THRE).
It doesn't provide the altitudes for the transition to the IAF or subsequent fixes, it doesn't show the vertical profile of the approach, it omits MDA/DA, TDZE and airport elevation, and it doesn't show climb-to and hold altitudes for the missed.
You can descend to 100 feet above TDZE using any approach lighting system (and a MALSR doesn't have red terminating bars anyway).
If the author is referencing 91,175, please note that operation below MDA based on visible and identifiable runway characteristics is 100 feet above TDZE, not 100 feet below MDA.
Dig deeper and you see the TDZEs differ by 45 feet.