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Mechanic realizes the next day; after installing a bonding strap on the aft drain mast; for a B737-700 aircraft. He did not use a bonding brush on the strap mounting hole and failed to do the resistance test correctly.
| Attributes | |
| ACN | 795409 |
| Time | |
| Date | 200806 |
| 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 : powerplant technician : airframe |
| ASRS Report | 795409 |
| Events | |
| Anomaly | aircraft equipment problem : less severe 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 |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : testing performance deficiency : repair performance deficiency : non compliance with legal requirements performance deficiency : installation |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Environmental Factor |
| Primary Problem | Maintenance Human Performance |
Narrative:
I installed a bonding strap on aircraft aft drain. I was thinking about this installation yesterday upon hearing a news story about keeping airplanes safe on the ground. While thinking about this news story; I realized I did not use a bonding brush on the new strap mounting hole. I had crawled out to get my bonding brush out of my tool box when I was asked a question by a co-worker. I answered the question and crawled back into the plane to finish the installation without getting my bonding brush. I obviously didn't test with the meter correctly for resistance on the strap. If I had done the resistance test correctly; I would have found my lack of bond brushing the hole for a proper ground.
Original NASA ASRS Text
Title: MECHANIC REALIZES THE NEXT DAY; AFTER INSTALLING A BONDING STRAP ON THE AFT DRAIN MAST; FOR A B737-700 ACFT. HE DID NOT USE A BONDING BRUSH ON THE STRAP MOUNTING HOLE AND FAILED TO DO THE RESISTANCE TEST CORRECTLY.
Narrative: I INSTALLED A BONDING STRAP ON ACFT AFT DRAIN. I WAS THINKING ABOUT THIS INSTALLATION YESTERDAY UPON HEARING A NEWS STORY ABOUT KEEPING AIRPLANES SAFE ON THE GND. WHILE THINKING ABOUT THIS NEWS STORY; I REALIZED I DID NOT USE A BONDING BRUSH ON THE NEW STRAP MOUNTING HOLE. I HAD CRAWLED OUT TO GET MY BONDING BRUSH OUT OF MY TOOL BOX WHEN I WAS ASKED A QUESTION BY A CO-WORKER. I ANSWERED THE QUESTION AND CRAWLED BACK INTO THE PLANE TO FINISH THE INSTALLATION WITHOUT GETTING MY BONDING BRUSH. I OBVIOUSLY DIDN'T TEST WITH THE METER CORRECTLY FOR RESISTANCE ON THE STRAP. IF I HAD DONE THE RESISTANCE TEST CORRECTLY; I WOULD HAVE FOUND MY LACK OF BOND BRUSHING THE HOLE FOR A PROPER GND.
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.