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NTSB asks FAA to revise safety assessments of runways during heavy rain

The U.S. National Transportation Safety Board called on the Federal Aviation Administration on Tuesday to revise its assessment of runway conditions during heavy rain, citing safety risks that airplanes could skid off the runway.

These recommendations are the result of NTSB investigations into 11 runway overrun incidents and accidents that occurred from 2008 to 2022 after landing on wet runways. The NTSB asked the FAA for a reform of the so-called?Runway Condition Assessment Matrix? that uses a 6-point scale to assess the condition of paved runways.

The board cited a 2019 runway overrun by a Boeing 737 at Jacksonville, Florida due, in part, to "an extreme lack of braking friction caused by heavy rain and water depth on the nongrooved 'runway which resulted viscous hydrplaning."

In the incident of 2019, a Boeing chartered by the U.S. Military was returning from Naval Station Guantanamo Bay, Cuba, with 142 passengers on board, when it slid off the 9,000-ft (2743-m-long) runway of Naval Air Station Jacksonville. No serious injuries were reported.

The?NTSB recommended that the FAA also issue new rainfall intensity descriptions for aviation weather reports in order to identify rainfall intensities above the?current threshold of heavy rain of 0.3 inch (7.62mm) per hour.

The FAA stated that it takes the recommendations of the NTSB seriously and will consider them carefully. The FAA encourages all airports to "report" wet runway conditions.

NTSB stated that the calculations of wheel braking friction for wet runways could be significantly less than those provided by FAA assessments due to limitations with the factors considered.

The NTSB stated that landing distances on wet airport runways calculated by the FAA model can "underpredict actual landing distances, increasing the risk of runway overrun." (Reporting and editing by Jamie Freed; David Shepardson)

(source: Reuters)