Date: 201809
Local time of day: 0601-1200
Location: DEN.Airport, CO
Flight conditions: VMC
Light: Daylight
Aircraft: B737 Next Generation Undifferentiated
Operator: Air Carrier
Operating under: Part 121
Mission: Passenger
Flight phase: Taxi
ATC / advisory: Ramp DEN
Aircraft component: Main Gear Tire
Reporter organization: Air Carrier
Reporter function: Pilot Flying; Captain
Reporter qualification: Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine; Flight Crew Instrument
Human factors: Troubleshooting
Second reporter function: Pilot Not Flying; First Officer
Anomaly: Aircraft Equipment Problem Less Severe
Detector: Person Flight Crew
When detected: Taxi
Result: Aircraft Aircraft Damaged; Flight Crew Regained Aircraft Control
Contributing factors: Aircraft
Primary problem: Aircraft

Narrative: Arrived at the aircraft. I did the walk around after briefing the flight attendants. Nothing unusual was noted on the walk around. The preflight; taxi; takeoff; cruise; and approach were normal; with absolutely nothing unusual happening. The arrival was flown to a visual approach to DEN Runway 16L; Flaps 30 ; auto brakes 2; REF 146; TGT 151; winds were southwest at 7 knots. The approach was stable. Touchdown was about 1500-2000 ft. down and smooth; the rollout was unremarkable. Full reverse; auto braking; and then manual braking were used in a normal way. We turned off at F4. Everything about the flight was normal to this point.After we started to taxi south on Foxtrot; I noticed the airplane pulling very slightly to the left. It was not a lot; just a little. There were no other unusual indications. I showed the FO (First Officer) what I was feeling. It really wasn't a big pull; and there were no other indications; but I thought we should write it up; since we felt nothing while taxiing in [departure]. We sent a [report] while taxiing. Shutdown #2 engine after turning on Taxiway BS. Everything else was normal until we turned toward the lead in line. There was a sudden very loud bang; and the airplane tilted hard to the right. I stopped the aircraft immediately. I didn't set the brakes because I was worried maybe it was a brake issue. The First Officer made a quick PA; and told the passengers to remain seated. We called Ramp; and told them we were stopped and that we needed to have the airplane inspected. While we were waiting another aircraft taxiing by said both of our right main tires were flat. Eventually Maintenance and Airfield Operations arrived. We determined we would deplane the airplane there; and it would have to be eventually towed in. After coordinating with Ramp and Maintenance; the passengers were deplaned. I debriefed the flight attendants. They all agreed they experienced nothing unusual until the loud bang on taxi in. The First Officer and I stayed on the aircraft until everyone else was off and then met the DEN chief pilot.


Second narrative: Upon arriving at the aircraft; the Captain volunteered to complete the walk-around while I completed my pre-flight duties in the cockpit. All aspects of our departure were normal and uneventful. We departed using reduced thrust and flaps 10. Upon liftoff; there were no abnormalities to note.Our approach and landing into Denver was also completely uneventful and followed SOP. The Captain was the flying pilot and met all stable approach criteria. We landed with flaps 30; auto brakes set to 2; REF speed was 146kts; target speed was 151kts; and the Captain landed smoothly at about the 2;000 foot runways marks on 16L. Deceleration was smooth and we exited at high speed Taxiway F4. While taxiing on Taxiway F; the Captain mentioned to me that the aircraft seemed to pull to the left a little bit. The Captain asked me to send an ELB (Electronic Logbook) entry regarding the pull to the left so Maintenance could look at the aircraft when we arrived that the gate.	We entered the ramp at taxi lane BS then proceeded toward the gate. The number 2 engine was shut down at this time. The Captain started a left turn toward the gate when we heard a loud bang and felt a thud. We both realized that we may have blown a tire. The Captain stopped the aircraft immediately and I made an announcement to the passengers to remain in their seats. We then proceeded to tell Ramp Control about our issue and contacted Maintenance. Both of the right side main tires were flattened. The inner tire had blown; and also caused damage to the underside of the fuselage. The passengers were offloaded from the plane via airstairs and brought to the terminal by bus. Ramp Control later advised that airport operations found no debris on the runway or subsequent taxiways.The Captain and I later discussed all phases of the flight and we both agreed there were no conclusive indications that we had a tire issue. The aircraft pulling left could have been any number of things and had suspected there was a flat tire; we would have stopped and called Maintenance to check the condition of the aircraft.


Synopsis: 737 flight crew reported both tires on right main gear were flat which caused them to deplane via airstairs as they were unable to pull into the gate.