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Pilot conducting an instructional flight in a cessna 172 reported a pronounced knocking and vibration emanating from the engine.
| Attributes | |
| ACN | 1544392 |
| Time | |
| Date | 201805 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | IMC |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Flight Phase | Final Approach |
| Component | |
| Aircraft Component | Engine |
| Person 1 | |
| Function | Instructor Pilot Not Flying |
| Qualification | Flight Crew Flight Instructor |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
While on the localizer xxr approach; [the] instructor pilot (ip) noted the engine making an odd noise and asked [the] pilot under instruction (pui) if he noticed the noise as well. Pui said it sounded fine to him. Initially; ip thought it may have just been the engine changing rpms because of the light chop while on the approach inbound. After completion of the approach; the pui executed the missed approach go-around and both ip and pui noticed a very loud knocking noise coming from the engine followed by severe vibration. Ip notified tower of our intentions and tower gave us a landing clearance on xxr. No emergency was declared and no assistance was requested. While on taxi back to the ramp; ip noticed that cylinder heat temperature (cht) 4 was excessively higher than all of the others. The knocking also continued while taxiing in; this time accompanied with the smell of exhaust fumes.
Original NASA ASRS Text
Title: Pilot conducting an instructional flight in a Cessna 172 reported a pronounced knocking and vibration emanating from the engine.
Narrative: While on the localizer XXR approach; [the] instructor pilot (IP) noted the engine making an odd noise and asked [the] pilot under instruction (PUI) if he noticed the noise as well. PUI said it sounded fine to him. Initially; IP thought it may have just been the engine changing RPMs because of the light chop while on the approach inbound. After completion of the approach; the PUI executed the missed approach go-around and both IP and PUI noticed a very loud knocking noise coming from the engine followed by severe vibration. IP notified tower of our intentions and tower gave us a landing clearance on XXR. No emergency was declared and no assistance was requested. While on taxi back to the ramp; IP noticed that Cylinder Heat Temperature (CHT) 4 was excessively higher than all of the others. The knocking also continued while taxiing in; this time accompanied with the smell of exhaust fumes.
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.