Thread: Overrun at VABB
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Old 06-05-2020, 09:31 PM
  #18  
cougar
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Joined APC: Jul 2005
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Grooved or PFC runways are used in determining performance. FAR Part 25 Amendment 25-92 in 1998 mandated that airplanes must be certified using both dry and wet takeoff data. The amendment also provides guidance for calculating performance on grooved or PFC runways, either using 70 percent of the dry Mu coefficient or the formulas provided in FAR 25.109. Grooved or PFC runway performance is only available when the runway is wet, not contaminated.

If the airplane was certified after 1998, the performance data for grooved/PFC runways is probably in the AFM/DPI or PET, and Boeing models 747-8, 787, 737 Max have this data.

For landing, Mumbai is an airport where operators should strongly consider applying SAFO 19003 guidance. If landing on grooved runways with heavy rain, or smooth runways with moderate or heavy rain, use RwyCC 2. Grooved/PFC runways are effective when the runway condition is wet. If the runway is contaminated, the efficacy of grooves is nil, which is effectively what the SAFO is stating.

SAFO 19003 was published due to 5 runway excursions in an approximately 30 day period last May/June, all due in part to rainy conditions.
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