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A B737 after takeoff discovered flap problems. Returned to departure airport. Problem found at flap 90 degree gearbox. Caused by maintenance error.
| Attributes | |
| ACN | 718488 |
| Time | |
| Date | 200611 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| ASRS Report | 718488 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : inspector |
| ASRS Report | 718766 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | other |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : testing performance deficiency : logbook entry performance deficiency : installation performance deficiency : inspection performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Aircraft Environmental Factor Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
My crew and I were to replace both 90 degree and 120 degree flap gear boxes as well as a full gear lube; logbook item and non routine items. At the same time both engines had heavy jobs requiring hydraulics to remain off most of the shift. After the gear boxes were mounted; we were unable to check their operation. Next the engines were leak checked. Then we came to the end of our shift. I did a verbal turnover. This event was brought to my attention at the beginning of my shift sat.
Original NASA ASRS Text
Title: A B737 AFTER TKOF DISCOVERED FLAP PROBS. RETURNED TO DEP ARPT. PROB FOUND AT FLAP 90 DEG GEARBOX. CAUSED BY MAINT ERROR.
Narrative: MY CREW AND I WERE TO REPLACE BOTH 90 DEG AND 120 DEG FLAP GEAR BOXES AS WELL AS A FULL GEAR LUBE; LOGBOOK ITEM AND NON ROUTINE ITEMS. AT THE SAME TIME BOTH ENGS HAD HVY JOBS REQUIRING HYDS TO REMAIN OFF MOST OF THE SHIFT. AFTER THE GEAR BOXES WERE MOUNTED; WE WERE UNABLE TO CHK THEIR OP. NEXT THE ENGS WERE LEAK CHKED. THEN WE CAME TO THE END OF OUR SHIFT. I DID A VERBAL TURNOVER. THIS EVENT WAS BROUGHT TO MY ATTN AT THE BEGINNING OF MY SHIFT SAT.
Data retrieved from NASA's ASRS site as of January 2009 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.