Narrative:

During descent; we discovered the first officer's master recall system light cover ('six-pack') was incorrect for the assembly. As 'recall' was pressed in conjunction with the descent checklist; the verbiage on the first officer's recall system displayed identical to the captain's recall lens cover. After gate arrival; the captain reviewed the logbook and found the assembly had been replaced [days earlier]. Maintenance was summoned and attempted to swap the [lens] light cover with the proper lens for the first officer's side; however upon installation of the replacement [lens]; the assembly would not illuminate. Further investigation revealed the [electrical] socket assembly installed earlier; although bearing the appropriate manufacturer's part number (according to the mechanic); was in fact a captain's socket assembly (left side) and would work with a first officer's lens cover (right side). The pins on the lens were left/right side socket specific. The incorrect installation was not readily discernible to flight crews since all twelve annunciators on the 'six-packs' would illuminate and apparently function normally. Only by reading the lettering on the lens was the error identified.

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Original NASA ASRS Text

Title: While performing a 'Before Landing' Checklist on a B737-800; a Captain and First Officer noticed the First Officer's Master Warning Annunciator panel 'six-pack' lights had identical verbiage displayed as the Captain's 'Recall' Annunciator 'six-pack' panel. Lettering for individual annunciator lights on First Officer's panel should be different than Captain's panel.

Narrative: During descent; we discovered the First Officer's Master Recall system light cover ('six-pack') was incorrect for the assembly. As 'Recall' was pressed in conjunction with the Descent Checklist; the verbiage on the First Officer's recall system displayed identical to the Captain's recall lens cover. After gate arrival; the Captain reviewed the Logbook and found the assembly had been replaced [days earlier]. Maintenance was summoned and attempted to swap the [lens] light cover with the proper lens for the First Officer's side; however upon installation of the replacement [lens]; the assembly would not illuminate. Further investigation revealed the [electrical] socket assembly installed earlier; although bearing the appropriate Manufacturer's Part Number (according to the Mechanic); was in fact a Captain's socket assembly (left side) and would work with a First Officer's lens cover (right side). The pins on the lens were left/right side socket specific. The incorrect installation was not readily discernible to flight crews since all twelve Annunciators on the 'six-packs' would illuminate and apparently function normally. Only by reading the lettering on the lens was the error identified.

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.