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A fokker 100 was discovered to have the improper circuit breaker installed in the essential AC buss. Breaker was of a higher amperage than required.
| Attributes | |
| ACN | 437939 |
| Time | |
| Date | 199904 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| 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 | Fokker 100 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : parked |
| Flight Plan | None |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : airframe technician : powerplant |
| ASRS Report | 437939 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 437940 |
| Events | |
| Anomaly | maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : inspection performance deficiency : installation performance deficiency : repair performance deficiency : non compliance with legal requirements |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
This aircraft was OTS for logbook item xx and xy at ZZZ. After troubleshooting system and talking to technical services, we were told to replace 32D circuit breaker essential AC buss supply. When I received the new breaker, I noticed it was a 20 amp breaker, the aircraft had a 25 amp breaker installed. I then went to the parts book to check the aircraft effectivity. I then went to the wiring manual to see if it called for a 20 amp breaker, which it did. Again we called technical services and informed them about the different breakers. I was told to install the breaker. After installing breaker and checking out system, I tried breaking down number of the 25 amp breaker to no avail.
Original NASA ASRS Text
Title: A FOKKER 100 WAS DISCOVERED TO HAVE THE IMPROPER CIRCUIT BREAKER INSTALLED IN THE ESSENTIAL AC BUSS. BREAKER WAS OF A HIGHER AMPERAGE THAN REQUIRED.
Narrative: THIS ACFT WAS OTS FOR LOGBOOK ITEM XX AND XY AT ZZZ. AFTER TROUBLESHOOTING SYS AND TALKING TO TECHNICAL SVCS, WE WERE TOLD TO REPLACE 32D CIRCUIT BREAKER ESSENTIAL AC BUSS SUPPLY. WHEN I RECEIVED THE NEW BREAKER, I NOTICED IT WAS A 20 AMP BREAKER, THE ACFT HAD A 25 AMP BREAKER INSTALLED. I THEN WENT TO THE PARTS BOOK TO CHK THE ACFT EFFECTIVITY. I THEN WENT TO THE WIRING MANUAL TO SEE IF IT CALLED FOR A 20 AMP BREAKER, WHICH IT DID. AGAIN WE CALLED TECHNICAL SVCS AND INFORMED THEM ABOUT THE DIFFERENT BREAKERS. I WAS TOLD TO INSTALL THE BREAKER. AFTER INSTALLING BREAKER AND CHKING OUT SYS, I TRIED BREAKING DOWN NUMBER OF THE 25 AMP BREAKER TO NO AVAIL.
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.