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An aircraft maintenance technician (amt) reports about a main battery charger that arced during removal for cleaning of the battery charger shelf in the east/east bay; on a B757-200 aircraft. Power was off the aircraft and C/bs for main and APU battery chargers were pulled. The arc caused the cleaning rags and insulation blankets to catch on fire. Technician acquired an onboard fire extinguisher and extinguished the fire.
| Attributes | |
| ACN | 1256498 |
| Time | |
| Date | 201504 |
| Local Time Of Day | 0001-0600 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Dawn |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Electrical Wiring & Connectors |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor |
Narrative:
The event took place two hours prior to end of shift [before dawn]. I was working alone. I was working a task card to clean the main aircraft battery charger rack and APU battery charger rack. I started with the main battery charger. Power was off of the aircraft. I pulled the [C/B] breakers for the main and APU battery chargers. I went into the forward east/east bay with cleaning rags and my tools. After disconnecting the main battery charger; I was removing the charger from the shelf and it arced. The rags caught on fire and very quickly the insulations blankets. I got out of the east/east bay and yelled to a coworker to call the fire department. I ran up the stairs to the plane and got one of the on-board fire extinguishers. I went back to the east/east bay and extinguished the fire. After the event I went for medical treatment.
Original NASA ASRS Text
Title: An Aircraft Maintenance Technician (AMT) reports about a Main Battery Charger that arced during removal for cleaning of the battery charger shelf in the E/E Bay; on a B757-200 aircraft. Power was off the aircraft and C/Bs for Main and APU battery chargers were pulled. The arc caused the cleaning rags and insulation blankets to catch on fire. Technician acquired an onboard fire extinguisher and extinguished the fire.
Narrative: The event took place two hours prior to end of shift [before dawn]. I was working alone. I was working a task card to clean the main aircraft battery charger rack and APU battery charger rack. I started with the Main Battery Charger. Power was off of the aircraft. I pulled the [C/B] breakers for the main and APU battery chargers. I went into the forward E/E Bay with cleaning rags and my tools. After disconnecting the main battery charger; I was removing the charger from the shelf and it arced. The rags caught on fire and very quickly the insulations blankets. I got out of the E/E Bay and yelled to a coworker to call the fire department. I ran up the stairs to the plane and got one of the on-board fire extinguishers. I went back to the E/E Bay and extinguished the fire. After the event I went for medical treatment.
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.