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A B757-200 on takeoff at 1000 ft had rudder ratio warning light illuminate. Third rudder ratio system failure within three days.
| Attributes | |
| ACN | 468965 |
| Time | |
| Date | 200004 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : atl.airport |
| State Reference | GA |
| Altitude | agl single value : 1000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tower : atl.tower |
| Operator | common carrier : air carrier |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : takeoff |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 180 flight time total : 11500 flight time type : 200 |
| ASRS Report | 468965 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : rudder ration fault light |
| Resolutory Action | none taken : unable |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : scheduled maintenance performance deficiency : testing performance deficiency : fault isolation |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Maintenance Human Performance Chart Or Publication Aircraft |
| Primary Problem | Maintenance Human Performance |
| Situations | |
| Publication | Flight Operations Manual |
Narrative:
Upon takeoff, rudder ratio light illuminated. Followed abnormal procedures which then imposed crosswind restriction of 15 KTS. Checked logbook, aircrew wrote up similar malfunction on leg immediately preceding ours. Maintenance 'fixed' it. Flew plane 2 days later, same thing happened. Callback conversation with reporter revealed the following information: the reporter stated the rudder ratio system failed three times in three days and is causing concern as the flight manual does not give adequate information on how to determine if the failure is in the low speed or high speed position. The reporter said this could be a problem with engine failure on takeoff and other flight modes. The reporter said maintenance is using the self test features on the left and right rudder ratio modules to troubleshoot the system but it continues to check ok.
Original NASA ASRS Text
Title: A B757-200 ON TKOF AT 1000 FT HAD RUDDER RATIO WARNING LIGHT ILLUMINATE. THIRD RUDDER RATIO SYS FAILURE WITHIN THREE DAYS.
Narrative: UPON TKOF, RUDDER RATIO LIGHT ILLUMINATED. FOLLOWED ABNORMAL PROCS WHICH THEN IMPOSED XWIND RESTRICTION OF 15 KTS. CHECKED LOGBOOK, AIRCREW WROTE UP SIMILAR MALFUNCTION ON LEG IMMEDIATELY PRECEDING OURS. MAINT 'FIXED' IT. FLEW PLANE 2 DAYS LATER, SAME THING HAPPENED. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE RUDDER RATIO SYS FAILED THREE TIMES IN THREE DAYS AND IS CAUSING CONCERN AS THE FLT MANUAL DOES NOT GIVE ADEQUATE INFO ON HOW TO DETERMINE IF THE FAILURE IS IN THE LOW SPEED OR HIGH SPEED POS. THE RPTR SAID THIS COULD BE A PROB WITH ENG FAILURE ON TKOF AND OTHER FLT MODES. THE RPTR SAID MAINT IS USING THE SELF TEST FEATURES ON THE L AND R RUDDER RATIO MODULES TO TROUBLESHOOT THE SYS BUT IT CONTINUES TO CHECK OK.
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.