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A north american T-6 in cruise at 2800 ft AGL declared an emergency and diverted due to the engine cowling departing the aircraft caused by failed rivets.
| Attributes | |
| ACN | 487067 |
| Time | |
| Date | 200009 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : 5c1.airport |
| State Reference | TX |
| Altitude | agl single value : 2800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | general aviation : personal |
| Make Model Name | Texan T6 Harvard |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent : vacating altitude |
| Flight Plan | None |
| Person 1 | |
| Affiliation | other |
| Function | instruction : instructor |
| Qualification | pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 75 flight time total : 4500 flight time type : 250 |
| ASRS Report | 487067 |
| Person 2 | |
| Affiliation | other |
| Function | instruction : trainee |
| Qualification | pilot : commercial pilot : cfi |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa other other : 2 |
| Resolutory Action | controller : provided flight assist flight crew : declared emergency flight crew : diverted to another airport flight crew : landed in emergency condition |
| Consequence | other other |
| Factors | |
| Maintenance | performance deficiency : inspection performance deficiency : repair |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On second training flight of the day, the modified T-6 was gently nosed over to 180 KTS when the cowling detached from the aft. The bottom section lodged on the right leading edge of the wing. A mayday was declared when the drag disrupted right elevator control to the point a normal landing was questionable. After ATC vector to sci a normal landing followed without further damage. It was found that a rivet line had failed allowing the cowling to shift enough to tear out the zeus fasteners and fail. A bolt has been added to prevent the movement of the cowling in the future. The cowling was not a stock T-6 part.
Original NASA ASRS Text
Title: A NORTH AMERICAN T-6 IN CRUISE AT 2800 FT AGL DECLARED AN EMER AND DIVERTED DUE TO THE ENG COWLING DEPARTING THE ACFT CAUSED BY FAILED RIVETS.
Narrative: ON SECOND TRAINING FLT OF THE DAY, THE MODIFIED T-6 WAS GENTLY NOSED OVER TO 180 KTS WHEN THE COWLING DETACHED FROM THE AFT. THE BOTTOM SECTION LODGED ON THE R LEADING EDGE OF THE WING. A MAYDAY WAS DECLARED WHEN THE DRAG DISRUPTED R ELEVATOR CTL TO THE POINT A NORMAL LNDG WAS QUESTIONABLE. AFTER ATC VECTOR TO SCI A NORMAL LNDG FOLLOWED WITHOUT FURTHER DAMAGE. IT WAS FOUND THAT A RIVET LINE HAD FAILED ALLOWING THE COWLING TO SHIFT ENOUGH TO TEAR OUT THE ZEUS FASTENERS AND FAIL. A BOLT HAS BEEN ADDED TO PREVENT THE MOVEMENT OF THE COWLING IN THE FUTURE. THE COWLING WAS NOT A STOCK T-6 PART.
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.