Air carrier captain reported a speed deviation during departure.

Attributes
ACN	1757412
Time
Date	202008
Local Time Of Day	0601-1200
Place
Locale Reference	ZZZ.TRACON
State Reference	US
Environment
Flight Conditions	VMC
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Climb
Flight Plan	IFR
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Instrument Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Events
Anomaly	Deviation - Procedural Clearance Deviation - Procedural Published Material / Policy Deviation - Speed All Types

Narrative:

ZZZZZ2 departure to zzzzz at 4;000 feet. Max airspeed at ZZZZZ1 230 kts; restriction loaded in FMS and briefed. Light aircraft with high climb performance; PF became concerned FD and at commands would cause difficult level off. Lowered pitch below FD command bar to correct which resulted in acceleration; PF thought VNAV and at weren't complying restriction and began to reduce thrust. Pm commanded correction to FD pitch and proper speed; but during correction speed accelerated above 230 kts to approximately 250 kts momentarily before correcting to 230 kts. Improper pitch and power for VNAV guidance and flight conditions. Proper understanding of how VNAV modes handle restrictions and good briefing of anticipated modes and performance beforehand.

Original NASA ASRS Text

Title: Air carrier Captain reported a speed deviation during departure.

Narrative: ZZZZZ2 Departure to ZZZZZ at 4;000 feet. Max airspeed at ZZZZZ1 230 kts; restriction loaded in FMS and briefed. Light aircraft with high climb performance; PF became concerned FD and AT commands would cause difficult level off. Lowered pitch below FD command bar to correct which resulted in acceleration; PF thought VNAV and AT weren't complying restriction and began to reduce thrust. PM commanded correction to FD pitch and proper speed; but during correction speed accelerated above 230 kts to approximately 250 kts momentarily before correcting to 230 kts. Improper pitch and power for VNAV guidance and flight conditions. Proper understanding of how VNAV modes handle restrictions and good briefing of anticipated modes and performance beforehand.

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.