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An MD80 technician working a hydraulic problem in the left wheel well removed a plate for access to units. Failed to tighten lower dzus fasteners.
| Attributes | |
| ACN | 633093 |
| Time | |
| Date | 200410 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : preflight ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 633093 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : company policies non adherence : far non adherence : published procedure |
| Independent Detector | other flight crewb |
| Resolutory Action | flight crew : overcame equipment problem other |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : inspection performance deficiency : installation performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
While investigating a hydraulic problem in the left wheel well area, I removed the plate to inspect the anti-skid valves and hydraulic piping in the area. When finished with the inspection, I reinstalled the plate but missed tightening lower dzus fasteners. I am keeping a more detailed written record of my maintenance actions and limiting myself to performing the task at hand before moving on to anything else. The plate is easy to remove and replace, and I was inspecting behind it after changing a hydraulic xfer pump and xfer 'corteral' valve. After putting the plate back in place, I had to check the pump again and forgot the last few fasteners in the plate.
Original NASA ASRS Text
Title: AN MD80 TECHNICIAN WORKING A HYD PROB IN THE L WHEEL WELL REMOVED A PLATE FOR ACCESS TO UNITS. FAILED TO TIGHTEN LOWER DZUS FASTENERS.
Narrative: WHILE INVESTIGATING A HYD PROB IN THE L WHEEL WELL AREA, I REMOVED THE PLATE TO INSPECT THE ANTI-SKID VALVES AND HYD PIPING IN THE AREA. WHEN FINISHED WITH THE INSPECTION, I REINSTALLED THE PLATE BUT MISSED TIGHTENING LOWER DZUS FASTENERS. I AM KEEPING A MORE DETAILED WRITTEN RECORD OF MY MAINT ACTIONS AND LIMITING MYSELF TO PERFORMING THE TASK AT HAND BEFORE MOVING ON TO ANYTHING ELSE. THE PLATE IS EASY TO REMOVE AND REPLACE, AND I WAS INSPECTING BEHIND IT AFTER CHANGING A HYD XFER PUMP AND XFER 'CORTERAL' VALVE. AFTER PUTTING THE PLATE BACK IN PLACE, I HAD TO CHK THE PUMP AGAIN AND FORGOT THE LAST FEW FASTENERS IN THE PLATE.
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.