Narrative:

Event-aircraft touched down in first-third of runway-autobrakes selection low-thrust reversers deployed during de-rotation-thrust reversers stowed 75-80 KIAS; followed by manual braking-aircraft used full length of runway plus approx 200 ft of runway safety area 900 ft x 200 ft plowed and swept in order to come to a full stopcontributing factors-ATIS received approx. 15 minutes prior to landing; runway surface condition reported as 5/5/5 rcam runway condition code rcc; 120 ft wide 100% compacted dry snow; remainder 4' dry snowhuman performance considerations-based on rcc report of 5/5/5 the pilot flying was anticipating 'good' braking action and therefore opted for configuration as stated-upon manual braking; the pilot flying determined that the braking action was not 'good' to the extent that braking deceleration; for the braking effort applied; and directional control were both significantly reduced-pilot flying could have better utilized deceleration devices; autobrake high; longer/sustained use of thrust reverser; in order to bring aircraft to a stop sooner-a lower or degraded rcc may have helped to cue the pilot flying to utilize a more conservative setup/configuration and response to braking effort; or even to consider not landingworthy of note-FAA AC 91-79A chg 1 appendix 1 table 1-1 operational runway condition assessment matrix rcam braking action codes and definitions uses the term 'compacted snow' with an ensuing rcc of 4 if -15 deg C and colder OAT; and an rcc of 3 if warmer than -15 deg C. Given the OAT at time of this event was -6 deg C; the rcc should have been more accurately reported as 3/3/3 due to 'compacted snow' and temperature combination.-within the previous 30-40 minutes; prior to the event landing; weather observations reported periods of heavy snow; moderate snow; and freezing fog-after landing the pilot flying made a PIREP with tower of 'braking action poor'

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Original NASA ASRS Text

Title: G650 Captain reported difficulty stopping within runway due to poor braking action.

Narrative: EVENT-Aircraft touched down in first-third of runway-Autobrakes selection LOW-Thrust reversers deployed during de-rotation-Thrust reversers stowed 75-80 KIAS; followed by manual braking-Aircraft used full length of runway plus approx 200 ft of Runway Safety Area 900 ft x 200 ft plowed and swept in order to come to a full stopCONTRIBUTING FACTORS-ATIS received approx. 15 minutes prior to landing; Runway Surface Condition reported as 5/5/5 RCAM Runway Condition Code RCC; 120 ft wide 100% compacted dry snow; remainder 4' dry snowHUMAN PERFORMANCE CONSIDERATIONS-Based on RCC report of 5/5/5 the pilot flying was anticipating 'Good' braking action and therefore opted for configuration as stated-Upon manual braking; the pilot flying determined that the braking action was NOT 'Good' to the extent that braking deceleration; for the braking effort applied; and directional control were both significantly reduced-Pilot flying could have better utilized deceleration devices; Autobrake High; longer/sustained use of thrust reverser; in order to bring aircraft to a stop sooner-A lower or degraded RCC may have helped to cue the pilot flying to utilize a more conservative setup/configuration and response to braking effort; or even to consider not landingWORTHY OF NOTE-FAA AC 91-79A CHG 1 Appendix 1 Table 1-1 Operational Runway Condition Assessment Matrix RCAM Braking Action Codes and Definitions uses the term 'Compacted Snow' with an ensuing RCC of 4 if -15 deg C and colder OAT; and an RCC of 3 if warmer than -15 deg C. Given the OAT at time of this event was -6 deg C; the RCC should have been more accurately reported as 3/3/3 due to 'compacted snow' and temperature combination.-Within the previous 30-40 minutes; prior to the event landing; weather observations reported periods of heavy snow; moderate snow; and freezing fog-After landing the pilot flying made a PIREP with Tower of 'Braking Action Poor'

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.