A B747-400 captain reported multiple false stick shaker events in cruise flight. After consulting wi...

Narrative:

During cruise flight we had gotten the stick shaker (both control columns) 4 different times; twice at FL310; .85; 320 KTS; FL360; .86; prior to descent. Each event lasted 5 to 45 seconds. All other indications were normal. The aircraft was being operated well within the normal cruise envelope. Air smooth. After the 4th event and just prior to top of descent we contacted maintenance advising him of the problem as a follow up to the [write-ups] we had submitted earlier in the evening. Maintenance had us pull and reset 2 C/bs (circuit breakers) affecting the multiple inputs to the warning systems. After I discussed this with the rest of the crew we were still concerned about the erroneous stall warning indications and agreed that we should pull the stick shaker C/bs prior to the approach and landing. Maintenance concurred with our decision. The 2 C/bs were pulled for the stick shakers. The approach and landing were normal.

Original NASA ASRS Text

Title: A B747-400 Captain reported multiple false stick shaker events in cruise flight. After consulting with Maintenance; the appropriate circuit breaker's were pulled to prevent nuisance alerts on approach and landing.

Narrative: During cruise flight we had gotten the stick shaker (both control columns) 4 different times; twice at FL310; .85; 320 KTS; FL360; .86; prior to descent. Each event lasted 5 to 45 seconds. All other indications were normal. The aircraft was being operated well within the normal cruise envelope. Air smooth. After the 4th event and just prior to top of descent we contacted Maintenance advising him of the problem as a follow up to the [write-ups] we had submitted earlier in the evening. Maintenance had us pull and reset 2 C/Bs (Circuit Breakers) affecting the multiple inputs to the warning systems. After I discussed this with the rest of the crew we were still concerned about the erroneous stall warning indications and agreed that we should pull the stick shaker C/Bs prior to the approach and landing. Maintenance concurred with our decision. The 2 C/Bs were pulled for the stick shakers. The approach and landing were normal.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	899552
Time
Date	201007
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.ARTCC
State Reference	US
Aircraft 1
Make Model Name	B747-400
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Component
Aircraft Component	Stall Warning System
Person 1
Function	Captain Pilot Not Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 200 Flight Crew Total 20000 Flight Crew Type 4000
Events
Anomaly	Aircraft Equipment Problem Less Severe

A B747-400 captain reported multiple false stick shaker events in cruise flight. After consulting with maintenance; the appropriate circuit breaker's were pulled to prevent nuisance alerts on approach and landing.