Originally Posted by
FlightDetent
ALD or RLD?
In the NTSB briefing (link posted above) it was stated that the available landing distance for this runway was 7800 feet. At maximum landing weight on a
wet grooved runway, a 737NG will require approximately 6800 feet of runway with both reversers, Flaps 30, max braking (air distance included). On a wet ungrooved runway (braking advisory medium), the calculated landing distance exceeds 8,300 feet. If braking action was medium to poor, the calculated distance exceeds 9500 feet. To be fair, all of these calculations are conservative, and demonstrated performance is usually better. The landing data calculator I have only gives a choice of both reversers or no reversers, again conservative for the one reverser inop scenario. Those calculations start at 8300 feet for the best case braking conditions and exceed 12,000 for medium/poor braking.
I do not know the actual landing weight, however according to the preliminary data the incident aircraft touched down at approximately 15 knots faster than the maximum weight Flaps 30 approach speed
with a 15 knot tailwind. This is 30 knots total faster than the entry condition for the calculations above. Given what we currently know, it does not appear that the aircraft could have been stopped within the confines of the runway even if they had landed in the touchdown zone with no subsequent bounce.