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SR20 instructor pilot reported number 4 cylinder went 'offline' on descent; but resumed normal operation shortly thereafter.
| Attributes | |
| ACN | 1595815 |
| Time | |
| Date | 201811 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Aircraft 1 | |
| Make Model Name | SR20 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Initial Approach |
| Component | |
| Aircraft Component | Engine |
| Person 1 | |
| Function | Instructor Pilot Not Flying |
| Qualification | Flight Crew Commercial Flight Crew Flight Instructor |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
On initial descent for the approach; student powered back from cruise to 30%. When powering back; instructor felt the aircraft starting to shake violently and continuously while descending. Instructor scanned engine instruments for any abnormality and noticed cylinder 4 egt and cht offline. Instructor; [as a] precaution; requested a visual for the south runway and switched the fuel tanks; turned the fuel pump on; etc. Instructor took controls. When nearing the airport; cylinder 4 came online; power was normal and vibrations ceased; abnormality was not duplicated throughout.
Original NASA ASRS Text
Title: SR20 instructor pilot reported Number 4 cylinder went 'offline' on descent; but resumed normal operation shortly thereafter.
Narrative: On initial descent for the approach; student powered back from cruise to 30%. When powering back; Instructor felt the aircraft starting to shake violently and continuously while descending. Instructor scanned engine instruments for any abnormality and noticed cylinder 4 EGT and CHT offline. Instructor; [as a] precaution; requested a visual for the south runway and switched the fuel tanks; turned the fuel pump on; etc. Instructor took controls. When nearing the airport; cylinder 4 came online; power was normal and vibrations ceased; abnormality was not duplicated throughout.
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.