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A B737-300 had a dim and test module replaced. Unit tripped circuit breaker and caused additional faults. Original module replaced and checked ok.
| Attributes | |
| ACN | 595513 |
| Time | |
| Date | 200309 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 595513 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : installation performance deficiency : logbook entry performance deficiency : testing |
| Supplementary | |
| Problem Areas | Company Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
On aircraft line remain overnight, replaced the dimming module. When aircraft power was turned on for the originating flight, the new module popped the circuit breaker. I found the P-2 cannon plug was loose. I resecured cannon plug, ran an operations check, system normal. Captain returned to gate and reported every bump caused fire warning light to illuminate. Further troubleshooting found WX radar rack was putting pressure on the P-2 cannon plug. Contacted maintenance control. Decided to reinstall original module and place it back on MEL till it could be repaired. Installed original module and ran a functional check per maintenance manual. Operations checked normal -- no faults.
Original NASA ASRS Text
Title: A B737-300 HAD A DIM AND TEST MODULE REPLACED. UNIT TRIPPED CIRCUIT BREAKER AND CAUSED ADDITIONAL FAULTS. ORIGINAL MODULE REPLACED AND CHKED OK.
Narrative: ON ACFT LINE REMAIN OVERNIGHT, REPLACED THE DIMMING MODULE. WHEN ACFT PWR WAS TURNED ON FOR THE ORIGINATING FLT, THE NEW MODULE POPPED THE CIRCUIT BREAKER. I FOUND THE P-2 CANNON PLUG WAS LOOSE. I RESECURED CANNON PLUG, RAN AN OPS CHK, SYS NORMAL. CAPT RETURNED TO GATE AND RPTED EVERY BUMP CAUSED FIRE WARNING LIGHT TO ILLUMINATE. FURTHER TROUBLESHOOTING FOUND WX RADAR RACK WAS PUTTING PRESSURE ON THE P-2 CANNON PLUG. CONTACTED MAINT CTL. DECIDED TO REINSTALL ORIGINAL MODULE AND PLACE IT BACK ON MEL TILL IT COULD BE REPAIRED. INSTALLED ORIGINAL MODULE AND RAN A FUNCTIONAL CHK PER MAINT MANUAL. OPS CHKED NORMAL -- NO FAULTS.
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.