Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Communication Breakdown; Training / Qualification; Situational Awareness
Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Environment - Non Weather Related; Human Factors
Departing ZZZ the pilot flying rotated to about 12 degrees. The aircraft was relatively lightly loaded. During the climb below acceleration height the airspeed increased (possibly due to being lightly loaded and current winds). I told the pilot flying to increase pitch; but the airspeed reached around 165 (possibly 166) for around 1 second. The airspeed stayed well below the AFM flaps 15 limit. I contacted the company for clarification on whether or not this required a logbook entry and was advised that this did not require an entry.  This was the last leg of the trip that night after sitting around for several hours. I should have been more proactive in identifying the airspeed trend increase and brought it to the PF's attention sooner.Being more proactive in identifying the airspeed trend would have allowed me to bring it to the PF's attention sooner.
Air Carrier First Officer reported a flap over-speed due to a rapid climb rate; resulting from a light passenger load.