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A mechanic describes his efforts to recheck the closing and arming forces on a B747-400; at door 5L; in order to verify he had correct opening and closing tension (forces) on the door handle. While lifting door handle approximately two inches; heard a hissing noise; door was opening on it's own; slide deployed.
| Attributes | |
| ACN | 840341 |
| Time | |
| Date | 200906 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B747-400 |
| 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 Critical Deviation - Procedural Maintenance Deviation - Procedural Published Material / Policy Deviation - Procedural FAR |
Narrative:
I was assigned to cabin work this day. I was working three job cards X; Y and Z. While working the check on job card 'Y'; I had (also) accomplished thru item 4; check of closing and arming forces. I had finished the check of the arming lever and wanted to recheck the forces of the door handle; being that the spring scale has both newton meter and pound scale; I wanted to be sure I had read the scale correctly; the reading was within tolerances. Also; this was my first time doing this check and first time doing these job cards; I was concerned that I had done it correctly. I lifted the door handle approximately 2 inches; when I heard a hissing noise and the door started to pull open. I then realized that the door was opening on it's own; I let go of the handle. The door opened fully and the slide deployed and inflated.
Original NASA ASRS Text
Title: A Mechanic describes his efforts to recheck the closing and arming forces on a B747-400; at door 5L; in order to verify he had correct opening and closing tension (forces) on the door handle. While lifting door handle approximately two inches; heard a hissing noise; door was opening on it's own; slide deployed.
Narrative: I was assigned to cabin work this day. I was working three Job Cards X; Y and Z. While working the check on Job Card 'Y'; I had (also) accomplished thru item 4; check of closing and arming forces. I had finished the check of the arming lever and wanted to recheck the forces of the door handle; being that the spring scale has both Newton meter and pound scale; I wanted to be sure I had read the scale correctly; the reading was within tolerances. Also; this was my first time doing this check and first time doing these job cards; I was concerned that I had done it correctly. I lifted the door handle approximately 2 inches; when I heard a hissing noise and the door started to pull open. I then realized that the door was opening on it's own; I let go of the handle. The door opened fully and the slide deployed and inflated.
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.