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.

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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.