Date: 202106
Local time of day: 0601-1200
Location: ZZZ.Airport, US
Flight conditions: VMC
Light: Daylight
Aircraft: B737 MAX 8
Operator: Air Carrier
Operating under: Part 121
Flight plan: IFR
Mission: Passenger
Flight phase: Taxi
Reporter organization: Air Carrier
Reporter function: First Officer; Pilot Not Flying
Reporter qualification: Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Human factors: Workload; Time Pressure; Situational Awareness; Distraction; Communication Breakdown; Confusion
Second reporter function: Pilot Flying; Captain
Anomaly: Aircraft Equipment Problem Less Severe; Deviation / Discrepancy - Procedural FAR; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural MEL / CDL; Flight Deck / Cabin / Aircraft Event Other / Unknown
Result: Flight Crew Became Reoriented
Contributing factors: Procedure; MEL; Human Factors; Aircraft
Primary problem: Human Factors

Narrative: Captain and FO (First Officer) experienced multiple additive conditions/factors that led to not completing checklists fully [and] briefing; that led to taxiing without selecting takeoff flaps. For example; use of opposite flow runway for takeoff; bleeds-off takeoff requirement; MEL that appeared to be corrected; ATOG and minimum required fuel to include MAX warm-up requirements; bleeds-off takeoff requirement; possible delay of 45 minutes for Ground to coordinate opposite direction takeoff from taxi call; i.e.; fuel concerns; trying to make push time; [and] single-engine taxi necessity. These additive conditions took us out of our normal flow and led to us taxiing without selecting takeoff flaps or running the Before-Taxi Checklist.We captured the error and threat during the Captain's Before-Takeoff Flow; with the Configuration Warning horn. We had not crossed the hold-short line; but the time it took us to run the QRH; correct the aircraft configuration; and then run the Before-Taxi and -Takeoff Checklists; Tower canceled our takeoff clearance; due to opposite direction requirement. We were shortly thereafter cleared for takeoff. We thoroughly debriefed what happened and how it happened; as we are both very experienced operators.


Second narrative: Due to multiple distractions and additive factors - opposite direction; full-length takeoff on XXL and coordination involved with fuel issues - an MEL I spent too much time getting an explanation from Maintenance; discussions managing minimum takeoff fuel and ATOG requirement; bleeds-off takeoff discussions; being fairly new to ETOPS and not fully in sync with my ETOPS flow; and allowing myself to get rushed to make push time; took us away from our normal flows and mistakes were made; culminating in a taxi without takeoff flaps set.Our error was captured with the before-takeoff flow throttle burst; as Tower cleared us for takeoff. We got the horn; and that put us in the yellow. We ran the QRH; reset the flaps; and ran the Before-Taxi and Before-Takeoff Checklist to ensure we didn't miss anything; and got back in the green. As we taxied toward the hold-short line; Tower cancelled our takeoff clearance. Tower re-cleared us for takeoff shortly thereafter. The rest of the flight was solidly in the green.


Synopsis: B737 MAX 8 flight crew reported human factors and distractions interfered with the proper completion of checklists and led to a misconfigured takeoff.