Narrative:

I was notified by management; that a B737-700 aircraft had a standby power discrepancy; reference log page dated march 2009. I was referenced to work card dated january 2009; engineering authorization (ea) procedure 2; step 8; which I had signed for; per which I installed the E4-2 rack. This rack includes 2 wires referenced by the log write-up; as being installed swapped. I have no clear recollection of installing the rack. As always; I'm sure that I followed the paper work as per the ea step.having reviewed step 8; it gives detailed instructions for installation of this rack. However; there is no instructions to install the two wires referenced above. Further research shows that procedure 3; step 22; requires the same standby power check in which they performed and found failed. Step 22 confirms that wires must have been correct before leaving in order to pass. This step is also an inspection buy back. I am unaware of when these 2 wires were connected; or by whom. Also; please note this same operational check is performed on every third service check; which is required every 14 days. Notified management today in order to get the paper work corrected to include specific instructions to connect these two wires correctly as part of the rack installation. I will follow up with engineering.the terminal strip for these wires is mounted in an unusual location/configuration; where it is easy to overlook. Very few rack installs have reconnects like this (without a disconnect plug). That makes it even more important to make special notes in the paperwork.

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Original NASA ASRS Text

Title: A Mechanic reports a standby power discrepancy logbook write-up involving an E4-2 electronic rack he installed in a B737-700. Two wires required to be connected to a terminal strip were found not reconnected.

Narrative: I was notified by Management; that a B737-700 aircraft had a standby power discrepancy; reference log page dated March 2009. I was referenced to work card dated January 2009; engineering authorization (EA) procedure 2; step 8; which I had signed for; per which I installed the E4-2 rack. This rack includes 2 wires referenced by the log write-up; as being installed swapped. I have no clear recollection of installing the rack. As always; I'm sure that I followed the paper work as per the EA step.Having reviewed step 8; it gives detailed instructions for installation of this rack. However; there is no instructions to install the two wires referenced above. Further research shows that procedure 3; step 22; requires the same standby power check in which they performed and found failed. Step 22 confirms that wires must have been correct before leaving in order to pass. This step is also an inspection buy back. I am unaware of when these 2 wires were connected; or by whom. Also; please note this same operational check is performed on every third service check; which is required every 14 days. Notified Management today in order to get the paper work corrected to include specific instructions to connect these two wires correctly as part of the rack installation. I will follow up with Engineering.The terminal strip for these wires is mounted in an unusual location/configuration; where it is easy to overlook. Very few rack installs have reconnects like this (without a disconnect plug). That makes it even more important to make special notes in the paperwork.

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.