If the Flight Manual does not provide specific instructions, what multiplier should be used to adjust the required landing distance for a wet paved runway?
When landing on a wet paved runway, braking effectiveness is reduced compared to a dry surface due to less friction between the tires and the runway. This causes an increase in the landing distance required to safely stop the aircraft.
Landing performance calculations should use the reported Runway Condition Code (RWYCC) provided by the aerodrome operator. If weather reports or forecasts suggest that runways might be contaminated at the estimated time of arrival, the Landing Distance Required (LDR) must not exceed the Landing Distance Available (LDA).
In cases where the Aircraft Flight Manual (AFM) does not specify a wet landing distance, apply a correction factor of 1.15 to the LDR to account for potentially reduced braking effectiveness. This means you increase the dry landing distance by 115%.
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