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A line mechanic reports that cabin window requirements in maintenance manual (M/M) 56-21-01 clearly state that part numbers on B777 outer window panes are to be situated at the top position of the window. However; passenger door window replacement language in MM 56-31-01 only references the vent hole for the middle pane of the door window.
| Attributes | |
| ACN | 982091 |
| Time | |
| Date | 201111 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Door Window |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
B777; aircraft X; door R-4 window; I believe; had the outer pane installed upside down. This is indicated by the part number on the pane being at the bottom of the window. Maintenance manual (MM) 56-31-01-X doesn't address this condition; only that the vent hole on the middle pane is to be positioned at the bottom. However; cabin window requirements; found in MM 56-21-01-X; clearly states the part numbers on the outer pane are to be situated at the top; as well as the vent hole on the bottom for the middle pane. I suspect this verbiage may accidentally be omitted from the door window replacement in MM 56-31-01-X. If I'm correct; then MM 56-31-01-X needs to be revised to indicate outer panes have a top and bottom. Also; aircraft X must be scheduled for a R-4 door window realignment.
Original NASA ASRS Text
Title: A Line Mechanic reports that cabin window requirements in Maintenance Manual (M/M) 56-21-01 clearly state that part numbers on B777 outer window panes are to be situated at the top position of the window. However; passenger door window replacement language in MM 56-31-01 only references the vent hole for the middle pane of the door window.
Narrative: B777; Aircraft X; door R-4 window; I believe; had the outer pane installed upside down. This is indicated by the part number on the pane being at the bottom of the window. Maintenance Manual (MM) 56-31-01-X doesn't address this condition; only that the vent hole on the middle pane is to be positioned at the bottom. However; cabin window requirements; found in MM 56-21-01-X; clearly states the part numbers on the outer pane are to be situated at the top; as well as the vent hole on the bottom for the middle pane. I suspect this verbiage may accidentally be omitted from the door window replacement in MM 56-31-01-X. If I'm correct; then MM 56-31-01-X needs to be revised to indicate outer panes have a top and bottom. Also; Aircraft X must be scheduled for a R-4 door window realignment.
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.