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Stick shaker and stall warning activated on air carrier medium large transport as it rotates for takeoff. Creates a communication problem for flight crew until it was silenced by pulling the stall computer's circuit breaker.
| Attributes | |
| ACN | 151232 |
| Time | |
| Date | 199007 |
| Day | Tue |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : bos |
| State Reference | MA |
| Altitude | agl bound lower : 0 agl bound upper : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : bos |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | climbout : intermediate altitude climbout : initial climbout : takeoff |
| Route In Use | departure other departure sid : sid |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 9500 flight time type : 1600 |
| ASRS Report | 151232 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 12500 flight time type : 300 |
| ASRS Report | 151789 |
| Events | |
| Anomaly | aircraft equipment problem : less severe |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : overcame equipment problem |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On rotation from runway 22 at bos, both stick shaker and stall warning activated. All other indication normal. Slow turn was initiated to comply with SID while aircraft performance was evaluated. VFR conditions were in effect. Power was kept at takeoff power beyond normal SID power back position. Normal procedures were accomplished with negative results to silence stick shaker, mute/test switch were cycled and stall warning circuit breaker's were pulled with no effect. Shaker finally were stopped by pullingstall computer circuit breaker's. All other indication were normal and flight was completed to destination where maintenance was accomplished. Note: with both shakers activated, communication in the cockpit was difficult due to high noise level.
Original NASA ASRS Text
Title: STICK SHAKER AND STALL WARNING ACTIVATED ON ACR MLG AS IT ROTATES FOR TKOF. CREATES A COM PROBLEM FOR FLT CREW UNTIL IT WAS SILENCED BY PULLING THE STALL COMPUTER'S CIRCUIT BREAKER.
Narrative: ON ROTATION FROM RWY 22 AT BOS, BOTH STICK SHAKER AND STALL WARNING ACTIVATED. ALL OTHER INDICATION NORMAL. SLOW TURN WAS INITIATED TO COMPLY WITH SID WHILE ACFT PERFORMANCE WAS EVALUATED. VFR CONDITIONS WERE IN EFFECT. PWR WAS KEPT AT TKOF PWR BEYOND NORMAL SID PWR BACK POS. NORMAL PROCS WERE ACCOMPLISHED WITH NEGATIVE RESULTS TO SILENCE STICK SHAKER, MUTE/TEST SWITCH WERE CYCLED AND STALL WARNING CB'S WERE PULLED WITH NO EFFECT. SHAKER FINALLY WERE STOPPED BY PULLINGSTALL COMPUTER CB'S. ALL OTHER INDICATION WERE NORMAL AND FLT WAS COMPLETED TO DEST WHERE MAINT WAS ACCOMPLISHED. NOTE: WITH BOTH SHAKERS ACTIVATED, COM IN THE COCKPIT WAS DIFFICULT DUE TO HIGH NOISE LEVEL.
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.