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A line mechanic describes his efforts to troubleshoot the cause of why a cabin door-3Left arm/disarm lever on a B757-200 aircraft would not disarm after gate arrival. While testing the door girt bar engagement and disengagement from the floor brackets; mechanic heard a click and hissing noise; slide deployed.
| Attributes | |
| ACN | 979196 |
| Time | |
| Date | 201111 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B757-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Escape Slide |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe |
Narrative:
I was called to the gate for a B757-200 aircraft with a door-3Left [that] would not disarm. I observed the disarmed/armed lever in the middle position; slide light 'off' and the door lever in the closed position. I pulled off the door bustle and moved the disarmed/armed lever back and forth with some difficult and observe the grit bar moving with slide light coming 'on/off' in sequence. I was able to move the disarmed/armed lever to the disarmed position and move the door open/close lever to open. Once past the door 'open' lever detent; I heard a click noise and a hissing sound and felt the door opening on it own. I held the door back; so the grit bar would not activate the slide. Another mechanic came to my assistance and he was trying to disconnect the girt bar from the door jam. After a few minutes and no success in disconnecting the grit bar; the door moved outward and began to deploy the slide.
Original NASA ASRS Text
Title: A Line Mechanic describes his efforts to troubleshoot the cause of why a cabin door-3Left ARM/DISARM lever on a B757-200 aircraft would not disarm after gate arrival. While testing the door girt bar engagement and disengagement from the floor brackets; Mechanic heard a click and hissing noise; slide deployed.
Narrative: I was called to the gate for a B757-200 aircraft with a door-3Left [that] would not disarm. I observed the Disarmed/Armed lever in the middle position; slide light 'off' and the door lever in the closed position. I pulled off the door bustle and moved the Disarmed/Armed lever back and forth with some difficult and observe the grit bar moving with slide light coming 'on/off' in sequence. I was able to move the Disarmed/Armed lever to the disarmed position and move the door Open/Close lever to open. Once past the door 'Open' lever detent; I heard a click noise and a hissing sound and felt the door opening on it own. I held the door back; so the grit bar would not activate the slide. Another Mechanic came to my assistance and he was trying to disconnect the girt bar from the door jam. After a few minutes and no success in disconnecting the grit bar; the door moved outward and began to deploy the slide.
Data retrieved from NASA's ASRS site as of April 2012 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.