TriStar overrun 1985
The accident to G-BBAI was not caused in any way by GPWS activity. A hard GPWS "Pull Up" command would have required a mandatory go-around, then as now. "Terrain" warnings on final approach in hilly terrain were treated as nuisance warnings and would not of themselves be the cause of deviation from the final stages of a stabilised approach. Modern day EGPWS takes care of the problem ,as already noted above.
The approach was an SRA onto RW14, there being no RW14 ILS in those days. The slope was 3.5 degrees and the threshold was displaced, both for obstacle clearance reasons.
The AAIB accident report concentrated on issues such as the braking capabilities and certification of the L1011, wet runway friction and the effect of the dished profile of the touchdown zone. The landing weight was close to the performance limited Regulated Landing Weight.
Last edited by Tagron; 18th Nov 2017 at 11:57.