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A B737-300 had a change order authority/authorized accomplished by a contract maintenance facility. Both HSI CRT displays had extra radar range lines added and was wrong confign.
| Attributes | |
| ACN | 662927 |
| Time | |
| Date | 200506 |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Experience | maintenance lead technician : 30 |
| ASRS Report | 662927 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : efis - radar range marks wrong other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : work cards performance deficiency : non compliance with legal requirements performance deficiency : testing performance deficiency : logbook entry performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Aircraft X arrived ZZZ with captain's/first officer's HSI display CRT incorrect format. Troubleshooting found change order authority/authorized accomplished by vendor had left mis-wired bench plug on symbol generators. Both vendors failed to accomplish change order authority/authorized per coa. Vendor signed off change order authority/authorized operations check as normal; however; it was incorrectly operations checked. Vendor read change order authority/authorized instructions backwards. Should have wired bench plug left or right. Vendor wired bench plug right to left. Callback conversation with reporter revealed the following information: the bench plugs on the symbol generators were wired incorrectly. Wiring was corrected at the bench plugs. Checks ok.
Original NASA ASRS Text
Title: A B737-300 HAD A CHANGE ORDER AUTH ACCOMPLISHED BY A CONTRACT MAINT FACILITY. BOTH HSI CRT DISPLAYS HAD EXTRA RADAR RANGE LINES ADDED AND WAS WRONG CONFIGN.
Narrative: ACFT X ARRIVED ZZZ WITH CAPT'S/FO'S HSI DISPLAY CRT INCORRECT FORMAT. TROUBLESHOOTING FOUND CHANGE ORDER AUTH ACCOMPLISHED BY VENDOR HAD L MIS-WIRED BENCH PLUG ON SYMBOL GENERATORS. BOTH VENDORS FAILED TO ACCOMPLISH CHANGE ORDER AUTH PER COA. VENDOR SIGNED OFF CHANGE ORDER AUTH OPS CHK AS NORMAL; HOWEVER; IT WAS INCORRECTLY OPS CHKED. VENDOR READ CHANGE ORDER AUTH INSTRUCTIONS BACKWARDS. SHOULD HAVE WIRED BENCH PLUG L OR R. VENDOR WIRED BENCH PLUG R TO L. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE BENCH PLUGS ON THE SYMBOL GENERATORS WERE WIRED INCORRECTLY. WIRING WAS CORRECTED AT THE BENCH PLUGS. CHKS OK.
Data retrieved from NASA's ASRS site as of January 2009 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.