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A B737-700 incurred wiring damage when a technician attempted to install a current meter sensor on a boost pump relay wire with power on.
| Attributes | |
| ACN | 560777 |
| Time | |
| Date | 200209 |
| Day | Thu |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 560777 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | other other : person 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | performance deficiency : installation performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance performance deficiency : unqualified personnel performance deficiency : testing |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Company |
| Primary Problem | Maintenance Human Performance |
Narrative:
While performing a function check for a rudder PCU leakage check, a relay wire shorted to ground. The short happened when I was attempting to install an amp clamp meter. The only reasonable cause for the short that I can think of is the wire had a bare spot and shorted to the adec clamp stand-off that was 1 inch or so away from where I was installing the amp clamp. We right&right'ed the P92 panel to fix the problem.
Original NASA ASRS Text
Title: A B737-700 INCURRED WIRING DAMAGE WHEN A TECHNICIAN ATTEMPTED TO INSTALL A CURRENT METER SENSOR ON A BOOST PUMP RELAY WIRE WITH PWR ON.
Narrative: WHILE PERFORMING A FUNCTION CHK FOR A RUDDER PCU LEAKAGE CHK, A RELAY WIRE SHORTED TO GND. THE SHORT HAPPENED WHEN I WAS ATTEMPTING TO INSTALL AN AMP CLAMP METER. THE ONLY REASONABLE CAUSE FOR THE SHORT THAT I CAN THINK OF IS THE WIRE HAD A BARE SPOT AND SHORTED TO THE ADEC CLAMP STAND-OFF THAT WAS 1 INCH OR SO AWAY FROM WHERE I WAS INSTALLING THE AMP CLAMP. WE R&R'ED THE P92 PANEL TO FIX THE PROB.
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.