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A DC10-10 in cruise at FL340 at mach pt 820 in smooth air had the stall warning stick shaker activate. Caused #2 stall warning system failure.
| Attributes | |
| ACN | 567087 |
| Time | |
| Date | 200211 |
| Day | Fri |
| Place | |
| Locale Reference | atc facility : zla.artcc |
| State Reference | CA |
| Altitude | msl single value : 34000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 50 flight time total : 8000 flight time type : 350 |
| ASRS Report | 567087 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 567089 |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : #2 stall warning stick shaker other flight crewa other flight crewb other other : person 3 |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
Narrative:
After reaching cruise altitude of FL340 with a speed of mach .820 and a weight of 393000 pounds in smooth air, the stick shaker activated. There was no slat extension. We followed the abnormal procedure for inadvertent stick shaker. By following this procedure we were able to determine the cause of the problem. The #2 stall warning had failed. The flight engineer then reset the circuit breakers for the #1 stall warning operation was normal. We then decided to continue to honolulu. Callback conversation with reporter revealed the following information: the cause of the false warning is unknown as maintenance has not reported the maintenance action taken or the component that failed.
Original NASA ASRS Text
Title: A DC10-10 IN CRUISE AT FL340 AT MACH PT 820 IN SMOOTH AIR HAD THE STALL WARNING STICK SHAKER ACTIVATE. CAUSED #2 STALL WARNING SYS FAILURE.
Narrative: AFTER REACHING CRUISE ALT OF FL340 WITH A SPD OF MACH .820 AND A WT OF 393000 LBS IN SMOOTH AIR, THE STICK SHAKER ACTIVATED. THERE WAS NO SLAT EXTENSION. WE FOLLOWED THE ABNORMAL PROC FOR INADVERTENT STICK SHAKER. BY FOLLOWING THIS PROC WE WERE ABLE TO DETERMINE THE CAUSE OF THE PROB. THE #2 STALL WARNING HAD FAILED. THE FE THEN RESET THE CIRCUIT BREAKERS FOR THE #1 STALL WARNING OP WAS NORMAL. WE THEN DECIDED TO CONTINUE TO HONOLULU. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE CAUSE OF THE FALSE WARNING IS UNKNOWN AS MAINT HAS NOT RPTED THE MAINT ACTION TAKEN OR THE COMPONENT THAT FAILED.
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.