B757-200 captain reported failure to slow to 250 knots below 10;000 feet on arrival into san.

Attributes
ACN	1545025
Time
Date	201805
Local Time Of Day	0001-0600
Place
Locale Reference	SAN.Airport
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	B757-200
Operating Under FAR Part	Part 121
Flight Phase	Descent
Flight Plan	IFR
Person 1
Function	Pilot Not Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural FAR Deviation - Procedural Published Material / Policy Deviation - Speed All Types

Narrative:

On comix RNAV arrival descending through approximately 11;000 ft on profile; given speed reduction of 210. Had pilot flying open speed window and put in 210 and apply full speed brakes while I put 210 in the VNAV descent page in order to make VNAV 'smart' for the rnp approach. I was heads down in the box and didn't catch the excessive speed and lack of VNAV speed protection; looked up and saw 280 KIAS at 9700 ft; descending and not decelerating. I took the aircraft; disengaged the autopilot; leveled and slowed to 210. ATC made no mention of speed. Failure to monitor pilot flying and automation in transition to 250/10;000 feet. Greater awareness of automation especially approaching critical phase of flight (10;000 feet).

Original NASA ASRS Text

Title: B757-200 Captain reported failure to slow to 250 knots below 10;000 feet on arrival into SAN.

Narrative: On COMIX RNAV arrival descending through approximately 11;000 ft on profile; given speed reduction of 210. Had Pilot Flying open speed window and put in 210 and apply full speed brakes while I put 210 in the VNAV descent page in order to make VNAV 'smart' for the RNP approach. I was heads down in the box and didn't catch the excessive speed and lack of VNAV speed protection; looked up and saw 280 KIAS at 9700 ft; descending and not decelerating. I took the aircraft; disengaged the autopilot; leveled and slowed to 210. ATC made no mention of speed. Failure to monitor Pilot Flying and automation in transition to 250/10;000 feet. Greater awareness of automation especially approaching critical phase of flight (10;000 feet).

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.