ECON cruise, LR cruise...
Join Date: Apr 2002
Location: MIRSI hold - give or take...
Age: 52
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Agreed - but that doesn't mean the 1000 ft in front of the TDZ are not suitable for the ground run of an aeroplane. If you land short, you're still on a load bearing surface of just the same quality as that of the TDZ and beyond.
The definition of Ground Run in performance is a different kettle of fish and involves the distance travelled by the aircraft from main wheel touchdown till the aircraft comes to a complete stop, assuming maximum breaking effort. Landing distance is the distance travelled from a screen height (typically 50 ft) till the aircraft comes to a complete stop.
Still agree with you - all of the LDA must be suitable for the ground run. However, using standard screen heights and path, your ground run will only start at the TDZ. If you look at the AFM tables for LDR, you will see one of the conditions being a screen height of 50 ft., signifying that the AFM figures include the distance travelled from 50 ft to the TDZ.