B737-700
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 175; Flight Crew Type 3137
Communication Breakdown
Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Human Factors; Procedure
Uneventful preflight; checklists; pushback; taxi and takeoff on first leg of four total on the last day of a three-day trip until receiving an ACARS message from Dispatch at (time) that read 'your Ops agent from ZZZ just called to say they neglected to give you hazmat paperwork to sign. You have oxygen cylinders onboard. 5 pieces totaling 280 lb.' On arrival at the gate in ZZZ1; the faxed hazmat paperwork was signed by the Captain. Out time: XX18Z. Takeoff Time: XX24Z. Notification: XX36Z. The crew were completely unaware of the hazmat onboard until notified by Dispatch. Once the discrepancy was discovered the Ops Agent made a timely call to Dispatch who contacted the Chief Pilot on call and the [Company Communications System]. Attention to detail from the Ops Agent or the agents responsible for supplying the paperwork to the Ops Agent would have mitigated this discrepancy.
B737-700 First Officer reported no pre-departure notification or documents of onboard hazmat shipment provided to the flight crew.