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Flight instructor assumes control from student pilot and rejected the takeoff when he heard a significant reduction in engine power for unknown reasons.
| Attributes | |
| ACN | 1225290 |
| Time | |
| Date | 201412 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | Takeoff |
| Component | |
| Aircraft Component | Fan |
| Person 1 | |
| Function | Instructor Pilot Not Flying |
| Qualification | Flight Crew Flight Instructor Flight Crew Commercial |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical |
Narrative:
Upon entering [runway] I had my student line up on the centerline of the runway and administer full power for takeoff. The student put in full power smoothly without any issues. At this point I made sure my student was keeping the aircraft straight down the runway; and moved my view point to the airspeed indicator; and then the engine gauges which were all sustained in their normal operating ranges. I looked at the tachometer which was also reading normal RPM's for takeoff. Approximately 4-5 seconds after I checked these instruments we experienced a loss of power. Both myself and the student heard the engine RPM reduce significantly. This loss of power occurred and lasted around 2 seconds. I took the flight controls of the aircraft and promptly aborted takeoff; notified ATC; applied brakes and exited the runway normally. I am positive that my student did not move the throttle in any way which would have caused the RPM decrease that we saw on takeoff. I estimate we lost approximately 300-400 RPM when the drop occurred.
Original NASA ASRS Text
Title: Flight instructor assumes control from student pilot and rejected the takeoff when he heard a significant reduction in engine power for unknown reasons.
Narrative: Upon entering [runway] I had my student line up on the centerline of the runway and administer full power for takeoff. The student put in full power smoothly without any issues. At this point I made sure my student was keeping the aircraft straight down the runway; and moved my view point to the airspeed indicator; and then the engine gauges which were all sustained in their normal operating ranges. I looked at the tachometer which was also reading normal RPM's for takeoff. Approximately 4-5 seconds after I checked these instruments we experienced a loss of power. Both myself and the student heard the engine RPM reduce significantly. This loss of power occurred and lasted around 2 seconds. I took the flight controls of the aircraft and promptly aborted takeoff; notified ATC; applied brakes and exited the runway normally. I am positive that my student did not move the throttle in any way which would have caused the RPM decrease that we saw on takeoff. I estimate we lost approximately 300-400 RPM when the drop occurred.
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.