Narrative:

I was on a cross country flight that was to last 2 hours in a cessna 172. We left for the trip with approximately 38 gallons on board as visually checked. We left at approximately noon and flew to a distant airport near class B airspace. I was flying back to home base and at approximately 15 miles from home base the engine started to run rough and lose power. I took over controls and looked at fuel indications and started heading into land as we were over the ocean. I started to troubleshoot and checked fuel supply and engine instruments. The left tank was showing approximately the same level as right about 1/2 full which was about the position I expected it to be on our trip. Engine oil pressure was in the green range and oil temperature was also in the green but dropping I tapped on the fuel indicator for the left tank and it dropped slightly just over 1/4 indication. The right tank indication didn't change. I applied carburetor heat; checked the magnetos and primer to make sure that I was locked in. Then I switched to the right tank and the engine started to run again and I continued to the closest suitable airport for inspection. The engine ran for approximately 5-7 minutes and I tried to gain altitude without giving up airspeed. As I was approaching the divert airport the engine quit again. I then decided that I would have to stretch the glide in order to make the airport and it was not worth the risk to make divert airport and I decided to make an off field landing for the safety of the flight. I looked out for a suitable landing site and I noticed that I could make it to a military air strip ramp. I closed the throttle and told approach that I needed to switch frequencies because I was having engine trouble and need to land at the airstrip. Approach told me to contact the controlling agency and asked me to hold while she looked up the frequency. I informed the controller that I knew the frequency; switched; called them and told them that I had an engine failure and was landing on the strip. The controller was talking to another aircraft on UHF then asked me to repeat. I told them what I was doing and stopped transmission to land the aircraft. I was able to land on the landing strip and bring the aircraft to a complete stop without damage to aircraft or injuries to passengers.

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Original NASA ASRS Text

Title: A C-172 engine began running roughly on a training flight then quit as the instructor was attempting to return so he landed at the nearest available strip which was a military base.

Narrative: I was on a cross country flight that was to last 2 hours in a Cessna 172. We left for the trip with approximately 38 gallons on board as visually checked. We left at approximately noon and flew to a distant airport near Class B Airspace. I was flying back to home base and at approximately 15 miles from home base the engine started to run rough and lose power. I took over controls and looked at fuel indications and started heading into land as we were over the Ocean. I started to troubleshoot and checked fuel supply and engine instruments. The left tank was showing approximately the same level as right about 1/2 full which was about the position I expected it to be on our trip. Engine oil pressure was in the green range and oil temperature was also in the green but dropping I tapped on the fuel indicator for the left tank and it dropped slightly just over 1/4 indication. The right tank indication didn't change. I applied Carburetor heat; checked the magnetos and primer to make sure that I was locked in. Then I switched to the right tank and the engine started to run again and I continued to the closest suitable airport for inspection. The engine ran for approximately 5-7 minutes and I tried to gain altitude without giving up airspeed. As I was approaching the divert airport the engine quit again. I then decided that I would have to stretch the glide in order to make the airport and it was not worth the risk to make divert airport and I decided to make an off field landing for the safety of the flight. I looked out for a suitable landing site and I noticed that I could make it to a military air strip ramp. I closed the throttle and told Approach that I needed to switch frequencies because I was having engine trouble and need to land at the airstrip. Approach told me to contact the controlling agency and asked me to hold while she looked up the frequency. I informed the Controller that I knew the frequency; switched; called them and told them that I had an engine failure and was landing on the strip. The Controller was talking to another aircraft on UHF then asked me to repeat. I told them what I was doing and stopped transmission to land the aircraft. I was able to land on the landing strip and bring the aircraft to a complete stop without damage to aircraft or injuries to passengers.

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.