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C172 pilot reported diverting to an alternate airport after hearing a 'pop' and noticing an RPM drop.
| Attributes | |
| ACN | 1470412 |
| Time | |
| Date | 201708 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Climb |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Engine |
| Person 1 | |
| Function | Pilot Flying |
| Qualification | Flight Crew Instrument Flight Crew Private |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
We were cleared for takeoff [and] were assigned to fly 3000 feet heading 150. Just before reaching 3000 feet; we got cleared to climb to 5000 feet heading 240. Just before reaching 5000 feet we heard a loud pop from the engine followed by an RPM drop of about 500 RPM. It took a moment for the engine to regain its normal RPM (perhaps 2 seconds). My crew partner and I talked to each other to see if either of us knew what just had happened. As we concluded that we didn't know the reason for the pop and RPM drop; we requested to divert back to [a nearby airport] to be cautious. Departure asked if we would like emergency [handling]. We responded saying that our engine is running fine now and verified by referencing all engine instruments. Departure directed us to [the nearby airport] and declared [on] our behalf an emergency to give us priority. To conclude; we decided it was safer to turn around and fly back to have our plane examined. As we landed a fire fighter truck and the police was waiting for us and making sure that we arrived safely.
Original NASA ASRS Text
Title: C172 pilot reported diverting to an alternate airport after hearing a 'pop' and noticing an RPM drop.
Narrative: We were cleared for takeoff [and] were assigned to fly 3000 feet heading 150. Just before reaching 3000 feet; we got cleared to climb to 5000 feet heading 240. Just before reaching 5000 feet we heard a loud pop from the engine followed by an RPM drop of about 500 RPM. It took a moment for the engine to regain its normal RPM (perhaps 2 seconds). My crew partner and I talked to each other to see if either of us knew what just had happened. As we concluded that we didn't know the reason for the pop and RPM drop; we requested to divert back to [a nearby airport] to be cautious. Departure asked if we would like emergency [handling]. We responded saying that our engine is running fine now and verified by referencing all engine instruments. Departure directed us to [the nearby airport] and declared [on] our behalf an emergency to give us priority. To conclude; we decided it was safer to turn around and fly back to have our plane examined. As we landed a fire fighter truck and the police was waiting for us and making sure that we arrived safely.
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.