B737 flight crew reported the #4 main gear tire had departed the aircraft during taxi in.

Attributes
ACN	1454426
Time
Date	201706
Local Time Of Day	1801-2400
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Dusk
Aircraft 1
Make Model Name	B737 Next Generation Undifferentiated
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Component
Aircraft Component	Main Gear Tire
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Type 2029
Person 2
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200 Flight Crew Type 2078
Events
Anomaly	Aircraft Equipment Problem Less Severe

Narrative:

After a normal landing; we exited on the high speed and headed toward the terminal. Just before we turned onto the ramp; we overheard an aircraft report debris and a tire on a taxiway. We were curious about the report; but did not think too much about it since we had not noticed any unusual or abnormal indications from the aircraft. We continued to the gate and went through normal procedures. Only after we shut down at the gate did we realize something was amiss as several ramp personnel were pointing to the right side of the aircraft. After completing the checklists; we went to see what was observed and saw that the right outboard tire was missing. While the entire flight was normal; there was one coincidental event. The tow bar pin broke on pushback. Maintenance was called and an entry was made. The mechanic talked to me on the intercom and said he saw no damage; but would do the complete inspection. The new release was received and the next pushback was completed without any further incident.

Original NASA ASRS Text

Title: B737 flight crew reported the #4 main gear tire had departed the aircraft during taxi in.

Narrative: After a normal landing; we exited on the high speed and headed toward the terminal. Just before we turned onto the ramp; we overheard an aircraft report debris and a tire on a taxiway. We were curious about the report; but did not think too much about it since we had not noticed any unusual or abnormal indications from the aircraft. We continued to the gate and went through normal procedures. Only after we shut down at the gate did we realize something was amiss as several ramp personnel were pointing to the right side of the aircraft. After completing the checklists; we went to see what was observed and saw that the right outboard tire was missing. While the entire flight was normal; there was one coincidental event. The tow bar pin broke on pushback. Maintenance was called and an entry was made. The mechanic talked to me on the intercom and said he saw no damage; but would do the complete inspection. The new release was received and the next pushback was completed without any further incident.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.