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A line mechanic reports how his lack of knowledge of a reference in the fault isolation manual (fim) for cockpit window pressure squeals; contributed to his not performing a proper cabin high pressure differential pressure check on a B757-200 aircraft. The captain's left sliding window area had chronic pressure squeals.
| Attributes | |
| ACN | 1094924 |
| Time | |
| Date | 201305 |
| Local Time Of Day | 1801-2400 |
| 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 | Cockpit Window |
| Person 1 | |
| Function | Technician |
| Qualification | Maintenance Powerplant Maintenance Airframe |
| Experience | Maintenance Technician 28 |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
A B757-200 aircraft arrived with a pilot report reading squeal at left-2 (L-2) [cockpit] window with aircraft at 17;000 ft and a cabin differential pressure of 6.5 psi. During the initial inspection; we found irregularities at the window jam which we found to be within limits. We burnished; primed; painted; and smoothed the [window] jam. During the confirmation pressurization [check]; we inadvertently over-pressurized by approximately 2 psi. The aircraft; while in [another maintenance base]; went through a complete check as outlined by boeing; with no damage found.
Original NASA ASRS Text
Title: A Line Mechanic reports how his lack of knowledge of a reference in the Fault Isolation Manual (FIM) for cockpit window pressure squeals; contributed to his not performing a proper cabin High Pressure Differential Pressure Check on a B757-200 aircraft. The Captain's left sliding window area had chronic pressure squeals.
Narrative: A B757-200 aircraft arrived with a pilot report reading squeal at Left-2 (L-2) [cockpit] window with aircraft at 17;000 FT and a cabin differential pressure of 6.5 PSI. During the initial inspection; we found irregularities at the window jam which we found to be within limits. We burnished; primed; painted; and smoothed the [window] jam. During the confirmation pressurization [check]; we inadvertently over-pressurized by approximately 2 PSI. The aircraft; while in [another Maintenance Base]; went through a complete check as outlined by Boeing; with no damage found.
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.