Date: 202008
Local time of day: 1801-2400
Location: ZZZ.TRACON, US
Aircraft: Commercial Fixed Wing
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Climb
Airspace: Class B ZZZ
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Flying
Reporter qualification: Flight Crew Air Transport Pilot (ATP)
Human factors: Time Pressure; Communication Breakdown; Situational Awareness
Second reporter function: Captain; Pilot Not Flying
Anomaly: Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Became Reoriented
Contributing factors: Human Factors; Environment - Non Weather Related
Primary problem: Human Factors

Narrative: As pilot flying we departed on Runway XXL; normal takeoff.  As we reached acceleration altitude I reduced power to climb and stated 'climb.' As I said this the Captain started his check in with departure. I waited for him to finish the call and stated 'climb' again. At this point I saw the hook coming up and safe speed was gone. I said something to the nature of we are below flap speed; lowering the nose and accelerating. The hook immediately started going back down; climb never stopped. We made our departure altitudes and continued climb.This all came together at once. The PM was making a call and I believe he mistook what I said. It was clearly a miscommunication. The Captain had mentioned before we left the gate that he had not flown recently; this probably also played a role. We were in a light weight airliner and the climb and acceleration were quicker than we see with full aircraft.For myself I will delay the power call until there is a break in radio calls. Out of habit we pull the power and say climb.


Second narrative: I was flying as PM.  On departure several duties occurred simultaneously; I became temporarily distracted and thought I heard the PF call for 'Flaps up.'  I reached for the flap lever and raised the flaps while looking at the airspeed indicator to ensure we were at the correct speed.  I believe I raised the flaps too early; before flap retraction speed; because after I moved the flap handle I saw our speed was very close to the 'hook' and was probably below normal flap retraction speed.  I was about to return the flaps to the Flaps 1 position but I saw that the speed was staying above the hook; accelerating and the PF said he'd lower the nose to accelerate faster. Looking back I must have heard 'Flaps Up' when the PF called 'Climb Power'Recency of experience probably contributed to my timing errors regarding the normal Flaps Up call out.  Several distractions contributed to the mistake - A radio call to contact Departure; failure to recheck our departure frequency on my taxi out; other calls to different aircraft at the same time as our 'Climb Power' call; as well as my lack of recent flying all contributed to my mistake in raising the flaps too early. Slow down; verify speed before flap retraction; double check frequencies on taxi out.


Synopsis: Air carrier flight crew reported a miscommunication during initial climb in a lightly-loaded aircraft resulted in retracting the flaps prematurely.