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Mechanic describes how a B737-700 aircraft right wing jack slid forward puncturing a hole in the lower forward part of the wing. Jack pad plug not removed prior to installing the wing jack pad.
| Attributes | |
| ACN | 794018 |
| Time | |
| Date | 200807 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 794018 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : briefing performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
I was working on aircraft that was in the hangar for the night for c-chk. I was assigned by my lead to work the right wing. The first thing that had to be done was jack the aircraft and perform a gear swing for a functional check. I started setting up the right wing to be jacked. I removed the screw that holds the jack pad plug to the wing. After I removed the screw; I attached the jack pad to the bottom of the wing without removing the plug. Tightened the jack pad; seated the jack and started raising the aircraft at the same time and rate as the others. As the aircraft started coming up and there was some weight on the jack pad; the bolt that held the jack pad in place had sheared and the jack slid forward; puncturing a hole in the bottom forward part of the wing. Come to find out; we found that I failed to remove the jack pad plug from under the wing. I have jacked other aircraft many times and this particular time I got in a hurry and had other things going through my mind that have been going on at home.
Original NASA ASRS Text
Title: MECHANIC DESCRIBES HOW A B737-700 ACFT RIGHT WING JACK SLID FORWARD PUNCTURING A HOLE IN THE LOWER FORWARD PART OF THE WING. JACK PAD PLUG NOT REMOVED PRIOR TO INSTALLING THE WING JACK PAD.
Narrative: I WAS WORKING ON ACFT THAT WAS IN THE HANGAR FOR THE NIGHT FOR C-CHK. I WAS ASSIGNED BY MY LEAD TO WORK THE R WING. THE FIRST THING THAT HAD TO BE DONE WAS JACK THE ACFT AND PERFORM A GEAR SWING FOR A FUNCTIONAL CHK. I STARTED SETTING UP THE R WING TO BE JACKED. I REMOVED THE SCREW THAT HOLDS THE JACK PAD PLUG TO THE WING. AFTER I REMOVED THE SCREW; I ATTACHED THE JACK PAD TO THE BOTTOM OF THE WING WITHOUT REMOVING THE PLUG. TIGHTENED THE JACK PAD; SEATED THE JACK AND STARTED RAISING THE ACFT AT THE SAME TIME AND RATE AS THE OTHERS. AS THE ACFT STARTED COMING UP AND THERE WAS SOME WT ON THE JACK PAD; THE BOLT THAT HELD THE JACK PAD IN PLACE HAD SHEARED AND THE JACK SLID FORWARD; PUNCTURING A HOLE IN THE BOTTOM FORWARD PART OF THE WING. COME TO FIND OUT; WE FOUND THAT I FAILED TO REMOVE THE JACK PAD PLUG FROM UNDER THE WING. I HAVE JACKED OTHER ACFT MANY TIMES AND THIS PARTICULAR TIME I GOT IN A HURRY AND HAD OTHER THINGS GOING THROUGH MY MIND THAT HAVE BEEN GOING ON AT HOME.
Data retrieved from NASA's ASRS site as of May 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.