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A line mechanic reports about the difference between the B767-200 master minimum equipment manual (mmel) 56-2 that allowing for the deferral of cabin door window heat even if the door window is obscured with ice or discolored and impossible to see through. The aircraft maintenance manual (amm) however requires the door window to have clear visibility for evacuation safety.
| Attributes | |
| ACN | 1081456 |
| Time | |
| Date | 201304 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Make Model Name | B767-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Door Window |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Experience | Maintenance Technician 25 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Procedural Published Material / Policy |
Narrative:
The right forward door (door 1-R) window on a B767-200 aircraft was obscured with either ice or discoloration of the acrylic [window]. It was impossible to see through the window. We tested the element of the heated pane and found an 'open' circuit. We were prepared to change the window when we were instructed to placard the door window heat using B767 MEL 56-2. The only requirement of this MEL is the deactivation of the window heat. It fails to mention anything about the clarity of the window. I believe this is an oversight. It would be a hazard if flight attendants could not see out the door window in the advent of an evacuation. Safety is being compromised if the window heat is placarded 'inoperative;' while the pane is obstructed. MEL 56-2 should require a clear/visible window for flight.
Original NASA ASRS Text
Title: A Line Mechanic reports about the difference between the B767-200 Master Minimum Equipment Manual (MMEL) 56-2 that allowing for the deferral of Cabin Door Window Heat even if the door window is obscured with ice or discolored and impossible to see through. The Aircraft Maintenance Manual (AMM) however requires the door window to have clear visibility for evacuation safety.
Narrative: The Right Forward Door (Door 1-R) window on a B767-200 aircraft was obscured with either ice or discoloration of the acrylic [window]. It was impossible to see through the window. We tested the element of the heated pane and found an 'open' circuit. We were prepared to change the window when we were instructed to placard the Door Window Heat using B767 MEL 56-2. The only requirement of this MEL is the deactivation of the Window Heat. It fails to mention anything about the clarity of the window. I believe this is an oversight. It would be a hazard if flight attendants could not see out the door window in the advent of an evacuation. Safety is being compromised if the Window Heat is placarded 'Inoperative;' while the pane is obstructed. MEL 56-2 should require a clear/visible window for flight.
Data retrieved from NASA's ASRS site as of July 2013 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.