Narrative:

The student was conducting his first night cross-country. We flew to ZZZ and conducted a normal landing. The landing was smooth and on centerline with no side loading. Upon landing we conducted our rollout and applied full power and were able to depart from ZZZ. On the way back; the student did a practice diversion into ZZZ1. We entered the pattern and planned to conduct a full-stop taxi back on runway xx. Student conducted an excellent landing; smooth and on centerline; and no excessive braking. On the rollout; student began to drift aircraft towards the left and seemed to have trouble maintain centerline. I called out 'my controls' and took control of the aircraft to get back on centerline. I began to apply right rudder and was unable to correct for the drift and regain centerline. I realized that we would be unable to correct; so I made the decision to get the aircraft off the runway in case any aircraft may try to land. I placed the aircraft just passed the numbers (1) in the grass. At that point; I asked the student to look and see if there is any problem on his main gear. He said yes and the tire is flat; I added power and full right rudder to attempt to get back on the runway. I was unable and knew the problem was not a flat tire. We shut down the aircraft and I inspected the tire. I found the tire was displaced from the wheel well. Upon determining that there was no immediate solution I called dispatch for assistance.in the future; I will check the tires before each landing in order to ensure they are in place and not flat. I will continue to land softly and ensure no unnecessary or unequal braking is applied during landing.

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Original NASA ASRS Text

Title: C172 flight instructor reported a loss of aircraft control on landing rollout resulted in a runway excursion.

Narrative: The student was conducting his first night cross-country. We flew to ZZZ and conducted a normal landing. The landing was smooth and on centerline with no side loading. Upon landing we conducted our rollout and applied full power and were able to depart from ZZZ. On the way back; the student did a practice diversion into ZZZ1. We entered the pattern and planned to conduct a full-stop taxi back on Runway XX. Student conducted an excellent landing; smooth and on centerline; and no excessive braking. On the rollout; student began to drift aircraft towards the left and seemed to have trouble maintain centerline. I called out 'my controls' and took control of the aircraft to get back on centerline. I began to apply right rudder and was unable to correct for the drift and regain centerline. I realized that we would be unable to correct; so I made the decision to get the aircraft off the runway in case any aircraft may try to land. I placed the aircraft just passed the numbers (1) in the grass. At that point; I asked the student to look and see if there is any problem on his main gear. He said yes and the tire is flat; I added power and full right rudder to attempt to get back on the runway. I was unable and knew the problem was not a flat tire. We shut down the aircraft and I inspected the tire. I found the tire was displaced from the wheel well. Upon determining that there was no immediate solution I called Dispatch for assistance.In the future; I will check the tires before each landing in order to ensure they are in place and not flat. I will continue to land softly and ensure no unnecessary or unequal braking is applied during landing.

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.