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An aircraft maintenance technician (amt) reports he did not verify circuit breakers (C/B) he had opened and attached red collars to; were the correct C/bs for a re-deferral of number 3 engine thrust reverser on a mcdonald douglas widebody aircraft.
| Attributes | |
| ACN | 1160826 |
| Time | |
| Date | 201403 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | McDonnell Douglas Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Circuit Breaker / Fuse / Thermocouple |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
During work on the number 3 engine thrust reverser (T/right); I closed the T/right control and T/right lock control circuit breakers (C/B). They had been opened for the deferral of the reverser. When I opened the circuit breakers; they had red collars that I left attached to make finding them easier. When I re deferred the thrust reverser system; I pulled the circuit beakers with the red collars and flipped the collars back around. They were in the correct area and I didn't think to look at the labels. Possibly someone knocked off the circuit breaker collar and put it back in the wrong place; compounded by my not verifying the circuit breakers I was pulling for the deferral. [Recommend] properly identifying the circuit breakers being pulled; instead of depending on a marker being in the correct position. Dayshift.
Original NASA ASRS Text
Title: An Aircraft Maintenance Technician (AMT) reports he did not verify Circuit Breakers (C/B) he had opened and attached red collars to; were the correct C/Bs for a re-deferral of Number 3 Engine Thrust Reverser on a McDonald Douglas widebody aircraft.
Narrative: During work on the Number 3 Engine Thrust Reverser (T/R); I closed the T/R Control and T/R Lock Control Circuit Breakers (C/B). They had been opened for the deferral of the Reverser. When I opened the Circuit Breakers; they had red collars that I left attached to make finding them easier. When I re deferred the Thrust Reverser System; I pulled the circuit beakers with the red collars and flipped the collars back around. They were in the correct area and I didn't think to look at the labels. Possibly someone knocked off the circuit breaker collar and put it back in the wrong place; compounded by my not verifying the circuit breakers I was pulling for the deferral. [Recommend] properly identifying the circuit breakers being pulled; instead of depending on a marker being in the correct position. Dayshift.
Data retrieved from NASA's ASRS site 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.