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A C172 on takeoff climb at 150 ft experienced a loud pop then black smoke appeared from under the instrument panel caused by shorted turn and bank indicator wiring.
| Attributes | |
| ACN | 438939 |
| Time | |
| Date | 199906 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : n67.airport |
| State Reference | PA |
| Altitude | agl single value : 150 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | other |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : instructional |
| Make Model Name | Skyhawk 172/Cutlass 172 |
| Operating Under FAR Part | Part 91 |
| Navigation In Use | other |
| Flight Phase | climbout : initial |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | other |
| Function | instruction : instructor |
| Qualification | pilot : cfi pilot : multi engine pilot : instrument pilot : commercial |
| Experience | flight time last 90 days : 130 flight time total : 425 flight time type : 80 |
| ASRS Report | 438939 |
| Person 2 | |
| Affiliation | other |
| Function | instruction : trainee |
| Qualification | pilot : student |
| Events | |
| Anomaly | aircraft equipment problem : critical |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : landed as precaution flight crew : landed in emergency condition |
| Consequence | other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
During taxi, it was noted that the turn coordinator was inoperative. The ball swung to the outside of the turn, but the miniature airplane remained level, instead of banking towards the inside of the turn. Otherwise, everything checked out ok. On the runup, after takeoff, approximately 150 ft AGL above the runway, there was a loud pop, then black smoke began to flow out from the panel. I then ventilated the cabin, windows open, shut down the electrical system, and brought the airplane (a C172) around the pattern for landing. As of now, maintenance personnel believe the cause to be a short in the wiring of the turn coordinator.
Original NASA ASRS Text
Title: A C172 ON TKOF CLB AT 150 FT EXPERIENCED A LOUD POP THEN BLACK SMOKE APPEARED FROM UNDER THE INST PANEL CAUSED BY SHORTED TURN AND BANK INDICATOR WIRING.
Narrative: DURING TAXI, IT WAS NOTED THAT THE TURN COORDINATOR WAS INOP. THE BALL SWUNG TO THE OUTSIDE OF THE TURN, BUT THE MINIATURE AIRPLANE REMAINED LEVEL, INSTEAD OF BANKING TOWARDS THE INSIDE OF THE TURN. OTHERWISE, EVERYTHING CHKED OUT OK. ON THE RUNUP, AFTER TKOF, APPROX 150 FT AGL ABOVE THE RWY, THERE WAS A LOUD POP, THEN BLACK SMOKE BEGAN TO FLOW OUT FROM THE PANEL. I THEN VENTILATED THE CABIN, WINDOWS OPEN, SHUT DOWN THE ELECTRICAL SYS, AND BROUGHT THE AIRPLANE (A C172) AROUND THE PATTERN FOR LNDG. AS OF NOW, MAINT PERSONNEL BELIEVE THE CAUSE TO BE A SHORT IN THE WIRING OF THE TURN COORDINATOR.
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.