Flight crew reported they failed to slow speed below 10;000 feet altitude.

Attributes
ACN	1694247
Time
Date	201910
Local Time Of Day	0601-1200
Place
Locale Reference	LGA.Airport
State Reference	NY
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Initial Approach
Route In Use	Direct STAR KORRY FOUR
Flight Plan	IFR
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Multiengine Flight Crew Instrument Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Captain Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Events
Anomaly	Deviation - Procedural FAR Deviation - Procedural Published Material / Policy Deviation - Speed All Types

Narrative:

We were descending on the korry 4 arrival to lga. Earlier in the arrival; ATC had assigned us 310 KTS or greater and I as the pilot flying had switched the speeds to manual. After reaching korry; we were told to fly direct to dials for the expressway visual runway 31 and descend to 4;000. I dialed in 4;000; confirmed it with the captain; and selected flight level change. It wasn't until about 8;000 feet that the captain noticed our airspeed had never been dialed back. To which he called out; 'airspeed'. I grabbed the throttles and thrusted them to idle and he instructed me to pitch up. I clicked off the autopilot and leveled off while he dialed back the airspeed to 250 KTS. To the best of my knowledge; we were at about 300 KTS when he first noticed the discrepancy. Once slowed; we continued the descent and re-engaged the automation. No notice was given by ATC regarding the incident and the rest of the flight continued without issues. In hindsight; what I should have done when given the instruction to descend to 4;000 was to first set the altitude; dial back the speed to 250; and then; once slowed to 250; select flight level change to begin the descent.

Original NASA ASRS Text

Title: Flight crew reported they failed to slow speed below 10;000 feet altitude.

Narrative: We were descending on the KORRY 4 arrival to LGA. Earlier in the arrival; ATC had assigned us 310 KTS or greater and I as the Pilot Flying had switched the speeds to manual. After reaching KORRY; we were told to fly direct to DIALS for the Expressway Visual runway 31 and descend to 4;000. I dialed in 4;000; confirmed it with the captain; and selected Flight Level Change. It wasn't until about 8;000 feet that the captain noticed our airspeed had never been dialed back. To which he called out; 'airspeed'. I grabbed the throttles and thrusted them to idle and he instructed me to pitch up. I clicked off the autopilot and leveled off while he dialed back the airspeed to 250 KTS. To the best of my knowledge; we were at about 300 KTS when he first noticed the discrepancy. Once slowed; we continued the descent and re-engaged the automation. No notice was given by ATC regarding the incident and the rest of the flight continued without issues. In hindsight; what I should have done when given the instruction to descend to 4;000 was to first set the altitude; dial back the speed to 250; and then; once slowed to 250; select flight level change to begin the descent.

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.