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Instructor with student pilot has rough engine and decrease in power on downwind departure. Precautionary landing.
| Attributes | |
| ACN | 147143 |
| Time | |
| Date | 199005 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : oak |
| State Reference | CA |
| Altitude | msl bound lower : 6 msl bound upper : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : oak |
| Operator | general aviation : instructional |
| Make Model Name | Small Aircraft, High Wing, 1 Eng, Fixed Gear |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | None |
| Person 1 | |
| Affiliation | Other |
| Function | instruction : instructor |
| Qualification | pilot : commercial pilot : instrument pilot : cfi |
| Experience | flight time last 90 days : 92 flight time total : 485 flight time type : 262 |
| ASRS Report | 147143 |
| Person 2 | |
| Affiliation | Other |
| Function | instruction : trainee |
| Qualification | pilot : student |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
After a normal preflight and runup my student and I departed oakland runway 27R on a right downwind departure (student flying). At approximately 800' MSL I heard a backfire and noticed a mild vibration from the engine. Approximately 15 seconds later I noticed a marked decrease in power and took control of the aircraft. At this time I told oakland tower that we had 'an engine problem' and requested an immediate landing back on runway 27R, which I was cleared for. We obviously had more than sufficient altitude to make the runway, so no emergency was declared. An uneventful landing was performed. The engine continued to run on the ground, but with some roughness. A magneto check showed no unusual RPM drop. I had the runway made, positively, so I never thought to apply carburetor heat immediately or to switch between magnetos. I believe my concentration was focused on landing since I was so close to the runway when the engine failed. I would have declared an emergency had I not been immediately cleared for 'any runway'. I don't think the situation could have been avoided since the engine was in good shape until the failure occurred.
Original NASA ASRS Text
Title: INSTRUCTOR WITH STUDENT PLT HAS ROUGH ENGINE AND DECREASE IN POWER ON DOWNWIND DEP. PRECAUTIONARY LNDG.
Narrative: AFTER A NORMAL PREFLT AND RUNUP MY STUDENT AND I DEPARTED OAKLAND RWY 27R ON A R DOWNWIND DEP (STUDENT FLYING). AT APPROX 800' MSL I HEARD A BACKFIRE AND NOTICED A MILD VIBRATION FROM THE ENG. APPROX 15 SECS LATER I NOTICED A MARKED DECREASE IN PWR AND TOOK CTL OF THE ACFT. AT THIS TIME I TOLD OAKLAND TWR THAT WE HAD 'AN ENG PROB' AND REQUESTED AN IMMEDIATE LNDG BACK ON RWY 27R, WHICH I WAS CLRED FOR. WE OBVIOUSLY HAD MORE THAN SUFFICIENT ALT TO MAKE THE RWY, SO NO EMER WAS DECLARED. AN UNEVENTFUL LNDG WAS PERFORMED. THE ENG CONTINUED TO RUN ON THE GND, BUT WITH SOME ROUGHNESS. A MAGNETO CHK SHOWED NO UNUSUAL RPM DROP. I HAD THE RWY MADE, POSITIVELY, SO I NEVER THOUGHT TO APPLY CARB HEAT IMMEDIATELY OR TO SWITCH BTWN MAGNETOS. I BELIEVE MY CONCENTRATION WAS FOCUSED ON LNDG SINCE I WAS SO CLOSE TO THE RWY WHEN THE ENG FAILED. I WOULD HAVE DECLARED AN EMER HAD I NOT BEEN IMMEDIATELY CLRED FOR 'ANY RWY'. I DON'T THINK THE SITUATION COULD HAVE BEEN AVOIDED SINCE THE ENG WAS IN GOOD SHAPE UNTIL THE FAILURE OCCURRED.
Data retrieved from NASA's ASRS site as of July 2007 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.