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A B737-200 encountered lateral trim problems on the first flight after maintenance caused by improper hydraulic line connection to the flight spoilers.
| Attributes | |
| ACN | 385724 |
| Time | |
| Date | 199711 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz |
| State Reference | US |
| Altitude | agl bound lower : 0 agl bound upper : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | other |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 385724 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | other other : other |
| ASRS Report | 385480 |
| Events | |
| Anomaly | aircraft equipment problem : critical non adherence : far non adherence : published procedure other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
Aircraft abc was at ZZZ station OTS due to a hydraulic leak above #1 engine pylon. Crew was sent to ZZZ to investigate cause and repair to return aircraft to service. Found main hydraulic supply line to pylon chaffed and leaking. During removal of hydraulic line, several lines and brackets are required to remove line. After 2 crews and 2 days, aircraft return to service. Aircraft then proceed to fly to xyz for routine maintenance and service check. During flight, crew reported trim problem. After troubleshooting the downline maintenance stated 2 spoiler lines were swapped, causing a spoiler to be inoperative. After review found all 4 hydraulic lines to be same size and 'B' nut all the same. Still uncertain at what point or how lines could have been swapped due to routing of lines and angles.
Original NASA ASRS Text
Title: A B737-200 ENCOUNTERED LATERAL TRIM PROBS ON THE FIRST FLT AFTER MAINT CAUSED BY IMPROPER HYD LINE CONNECTION TO THE FLT SPOILERS.
Narrative: ACFT ABC WAS AT ZZZ STATION OTS DUE TO A HYD LEAK ABOVE #1 ENG PYLON. CREW WAS SENT TO ZZZ TO INVESTIGATE CAUSE AND REPAIR TO RETURN ACFT TO SVC. FOUND MAIN HYD SUPPLY LINE TO PYLON CHAFFED AND LEAKING. DURING REMOVAL OF HYD LINE, SEVERAL LINES AND BRACKETS ARE REQUIRED TO REMOVE LINE. AFTER 2 CREWS AND 2 DAYS, ACFT RETURN TO SVC. ACFT THEN PROCEED TO FLY TO XYZ FOR ROUTINE MAINT AND SVC CHK. DURING FLT, CREW RPTED TRIM PROB. AFTER TROUBLESHOOTING THE DOWNLINE MAINT STATED 2 SPOILER LINES WERE SWAPPED, CAUSING A SPOILER TO BE INOP. AFTER REVIEW FOUND ALL 4 HYD LINES TO BE SAME SIZE AND 'B' NUT ALL THE SAME. STILL UNCERTAIN AT WHAT POINT OR HOW LINES COULD HAVE BEEN SWAPPED DUE TO ROUTING OF LINES AND ANGLES.
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.