Date: 201911
Local time of day: 0001-0600
Location: ZZZ.Airport, US
Flight conditions: Marginal
Weather elements / visibility: Icing; Turbulence
Light: Night
Aircraft: ATR 42
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Cargo / Freight / Delivery
Flight phase: Climb
Airspace: Class C ZZZ
ATC / advisory: TRACON ZZZ
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Not Flying
Reporter qualification: Flight Crew Multiengine; Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP)
Human factors: Troubleshooting; Workload
Anomaly: Aircraft Equipment Problem Less Severe; Deviation - Speed All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Inflight Event / Encounter Weather / Turbulence
Detector: Person Flight Crew
When detected: In-flight
Result: Flight Crew Overcame Equipment Problem
Contributing factors: Human Factors; Aircraft
Primary problem: Aircraft

Narrative: On departure off Runway 36 from ZZZ; experienced an AFCS DATA invalid message just after rotation. The event dropped guidance from the flight director from both PIC and SIC EADI's. The PIC was Pilot Monitoring; and the SIC was Pilot Flying. After an attempt to reset the AFCS for the phase of flight; the flight director modes were returned to normal operation. However; due to the timing of the failure; shortly after rotation; and the high workload phase of flight; the landing gear was left in the down position. The aircraft was configured for atmospheric icing conditions in level 2. Upon reaching acceleration altitude; the climb sequence was initiated; and the after takeoff flow was performed. Due to the necessity of passing red bug; before final flap retraction; there was a delay in the after takeoff checklist. To accelerate the aircraft. The pilot flying was advised to reduce pitch slightly. After VFTO icing was reached; the flaps were retracted to 0. ATC advised frequency change to departure. Once on ZZZ Departure; a new heading and altitude were issued. While this was occurring; the aircraft in a slightly reduced pitch climb; accelerated rapidly. The over speed aural clacker was observed and CM1 commanded a power reduction. Both pilots attention went first to the airspeed indicators which were noted at 172 kts. PIC and 168 kts. SIC; then to the flap handle and flap position indicator. They were observed to be in the proper position for phase of flight. However; it was noted that the gear was not in the proper position; and was the source of the over speed warning. The gear was retracted; and the after takeoff checklist was completed. The run was then completed with no further issues. Operations; Maintenance Control; and Management were notified upon completion of the flight.After the over speed clacker was observed; both pilots attention went first to the airspeed indicators which were noted at 172 kts. PIC and 168 kts. SIC; then to the flap handle and flap position indicator. They were observed to be in the proper position for phase of flight. However; it was noted that the gear was not in the proper position; and was the source of the over speed warning.Both pilots attention went first to the airspeed indicators which were noted at 172 kts. PIC and 168 kts. SIC; then to the flap handle and flap position indicator. They were observed to be in the proper position for phase of flight. However; it was noted that the gear was not in the proper position; and was the source of the over speed warning. The gear was retracted; and the after takeoff checklist was completed. The run was then completed with no further issues.Follow proper SOP's concerning issues below acceleration altitude unless a greater emergency exists.




Synopsis: ATR42 First Officer reported that distraction during departure resulted in an overspeed condition with the landing gear still extended.