Narrative:

[I was] assigned [job] cards to change the # 1; 2 and center fuel quantity transient suppression device (tsd) boxes on a B737-300 aircraft and a task card to inspect the tsd harnesses. An inspection found the center tank tsd harness bad. After writing a non-routine [write-up] for the harness; I started on the tsd boxes on # 1; 2; and center. I asked for another aviation maintenance technician (amt) to do the remove and replace (right/right) of the center tsd harness. I then temporarily installed the center tsd box with mount bolts finger tight to make it easier to connect the harness to the box. I did not convey this to the amt doing the harness and he did not notice the loose bolts. I did look over the center tsd harness installation when he was finished; but did not notice the condition of the bolts. After going through the job mentally later that day; it occurred to me that the bolts may have been overlooked. The amt installing the harness said he only did the harness connection to the box. It was at this time that I contacted maintenance control. The aircraft was routine overnight (ron) in ZZZ and the amt there investigated; verified and corrected the loose bolts. There was a lack of communication between the two amts. I should be more thorough in my post maintenance inspection of work performed; and should not temporarily install parts.

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Original NASA ASRS Text

Title: A Line Mechanic loosely installed mount bolts during replacement of a Center Tank Fuel Quantity Transient Suppression Device (TSD) on a B737-300 aircraft to allow another Mechanic to connect a wire harness to the TSD. Mechanic realized after the aircraft departed that the mount bolts may not have been tightened.

Narrative: [I was] assigned [Job] Cards to change the # 1; 2 and Center Fuel Quantity Transient Suppression Device (TSD) boxes on a B737-300 aircraft and a Task Card to inspect the TSD harnesses. An inspection found the Center tank TSD harness bad. After writing a Non-Routine [Write-up] for the harness; I started on the TSD boxes on # 1; 2; and Center. I asked for another Aviation Maintenance Technician (AMT) to do the Remove and Replace (R/R) of the Center TSD harness. I then temporarily installed the Center TSD box with mount bolts finger tight to make it easier to connect the harness to the box. I did not convey this to the AMT doing the harness and he did not notice the loose bolts. I did look over the center TSD harness installation when he was finished; but did not notice the condition of the bolts. After going through the job mentally later that day; it occurred to me that the bolts may have been overlooked. The AMT installing the harness said he only did the harness connection to the box. It was at this time that I contacted Maintenance Control. The aircraft was Routine Overnight (RON) in ZZZ and the AMT there investigated; verified and corrected the loose bolts. There was a lack of communication between the two AMTs. I should be more thorough in my post maintenance inspection of work performed; and should not temporarily install parts.

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.