Narrative:

When performing flight data recorder operations check per engineering change order wxxx, found 115 vac missing to digital acquisition flight data unit. Troubleshot system per wire diagram manual chapter 31 and also per wire diagram manual, found wire W065-11-22 of plug D493P in pin #5 wrong per wire diagram manual and red book -- they both showed/said wire should be in pin #8 of D493P. Repinned plug and system worked normal per chkout. After aircraft xyz left for service and after further discussion with fellow avionics crew members, we discovered that plug D493P was indeed pinned correct per engineering change order wxxx, per card #2 page 3. So that means wire diagram manual and manual were incorrect or not updated. Aircraft is currently out of confign per engineering change order wxxx. System should have worked per engineering change order wiring, but did not. Suspect flight data recorder panel is bad and wire #W065-11-22 of D493P should be repinned back to pin #5 per engineering change order. After repinned and panel replaced to recertify presence of 115 vac to digital acquisition flight data unit.

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Original NASA ASRS Text

Title: A B767-300 WAS RELEASED FOR SVC IN NON COMPLIANCE WITH THE DIGITAL ACQUISITION FLT DATA UNIT WIRED INCORRECTLY DUE TO AN INACCURATE WIRE DIAGRAM MANUAL.

Narrative: WHEN PERFORMING FLT DATA RECORDER OPS CHK PER ENGINEERING CHANGE ORDER WXXX, FOUND 115 VAC MISSING TO DIGITAL ACQUISITION FLT DATA UNIT. TROUBLESHOT SYS PER WIRE DIAGRAM MANUAL CHAPTER 31 AND ALSO PER WIRE DIAGRAM MANUAL, FOUND WIRE W065-11-22 OF PLUG D493P IN PIN #5 WRONG PER WIRE DIAGRAM MANUAL AND RED BOOK -- THEY BOTH SHOWED/SAID WIRE SHOULD BE IN PIN #8 OF D493P. REPINNED PLUG AND SYS WORKED NORMAL PER CHKOUT. AFTER ACFT XYZ LEFT FOR SVC AND AFTER FURTHER DISCUSSION WITH FELLOW AVIONICS CREW MEMBERS, WE DISCOVERED THAT PLUG D493P WAS INDEED PINNED CORRECT PER ENGINEERING CHANGE ORDER WXXX, PER CARD #2 PAGE 3. SO THAT MEANS WIRE DIAGRAM MANUAL AND MANUAL WERE INCORRECT OR NOT UPDATED. ACFT IS CURRENTLY OUT OF CONFIGN PER ENGINEERING CHANGE ORDER WXXX. SYS SHOULD HAVE WORKED PER ENGINEERING CHANGE ORDER WIRING, BUT DID NOT. SUSPECT FLT DATA RECORDER PANEL IS BAD AND WIRE #W065-11-22 OF D493P SHOULD BE REPINNED BACK TO PIN #5 PER ENGINEERING CHANGE ORDER. AFTER REPINNED AND PANEL REPLACED TO RECERTIFY PRESENCE OF 115 VAC TO DIGITAL ACQUISITION FLT DATA UNIT.

Data retrieved from NASA's ASRS site as of July 2007 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.