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Seven mechanics report on their involvement with a B777-200 aircraft jacking procedure that resulted in damage to the left and right wing lower inboard aft panels at jack points 'east' and 'F'. One mechanic; who was informed he had installed the jack pad adapters backwards at the same location; noted the adapters are not marked as to proper orientation for installation.
| Attributes | |
| ACN | 910849 |
| Time | |
| Date | 201009 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Person 2 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy Ground Event / Encounter Object |
Narrative:
At the beginning of the shift; I was assigned by my lead mr.'a'; along with my fellow amt mechanic 'Y'; to work at jack point 'east' on left hand [wing]; inboard side of the wing; to jack the aircraft. When I was at the site; I found the jack pad [adapter] was already installed and jack was seated with the 4;000 pounds of pressure on it. When all the jacks were in place; my lead mr.'a' instructed us to start jacking and he left the site to check on the right wing jacking area. I was on the left-hand wing dock to make sure the jack gets locked as the jacking process continues. As my colleague mr.'Y' opened up the pneumatic pressure; the jacking process started. As jacking process was undergoing; I heard the panel cracking sound; I found the panel underneath the jack pad started cracking and I yelled at my colleague mr.'Y' to stop the jacking process. At this point he immediately stopped the jacking process.
Original NASA ASRS Text
Title: Seven Mechanics report on their involvement with a B777-200 aircraft jacking procedure that resulted in damage to the left and right wing lower inboard aft panels at jack points 'E' and 'F'. One Mechanic; who was informed he had installed the jack pad adapters backwards at the same location; noted the adapters are not marked as to proper orientation for installation.
Narrative: At the beginning of the shift; I was assigned by my Lead Mr.'A'; along with my fellow AMT Mechanic 'Y'; to work at jack point 'E' on left hand [wing]; inboard side of the wing; to jack the aircraft. When I was at the site; I found the jack pad [adapter] was already installed and jack was seated with the 4;000 LBS of pressure on it. When all the jacks were in place; my Lead Mr.'A' instructed us to start jacking and he left the site to check on the right wing jacking area. I was on the left-hand wing dock to make sure the jack gets locked as the jacking process continues. As my colleague Mr.'Y' opened up the pneumatic pressure; the jacking process started. As jacking process was undergoing; I heard the panel cracking sound; I found the panel underneath the jack pad started cracking and I yelled at my colleague Mr.'Y' to stop the jacking process. At this point he immediately stopped the jacking process.
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.