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A B737-500 was released from a heavy maintenance check with rudder control cable tension rigged incorrectly. Wrong reference used for tensiometer setting.
| Attributes | |
| ACN | 670496 |
| Time | |
| Date | 200508 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : inspector |
| Qualification | technician : airframe technician : powerplant technician : inspection authority |
| Experience | maintenance avionics : 19 |
| ASRS Report | 670496 |
| Person 2 | |
| Affiliation | company : air carrier |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance technician : 14 |
| ASRS Report | 670497 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : tooling performance deficiency : non compliance with legal requirements performance deficiency : inspection performance deficiency : testing performance deficiency : scheduled maintenance |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Chart Or Publication Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
On aug/fri/05 during the rigging of the rudder control system on aircraft Y was discovered that incorrect data was used to tension the body cables on aircraft X when the aircraft was in check in july. Supervision was immediately notified and the supervisors; through maintenance control; located the aircraft and had the cable tension checked and reset. Failed to use the correct manual when checking for cable size. This mistake led us to the wrong cable tensioning data. I suspect that the rigging job took place on the first day back from vacation and my attention was not what it should have been.
Original NASA ASRS Text
Title: A B737-500 WAS RELEASED FROM A HVY MAINT CHK WITH RUDDER CTL CABLE TENSION RIGGED INCORRECTLY. WRONG REF USED FOR TENSIOMETER SETTING.
Narrative: ON AUG/FRI/05 DURING THE RIGGING OF THE RUDDER CTL SYS ON ACFT Y WAS DISCOVERED THAT INCORRECT DATA WAS USED TO TENSION THE BODY CABLES ON ACFT X WHEN THE ACFT WAS IN CHK IN JULY. SUPERVISION WAS IMMEDIATELY NOTIFIED AND THE SUPVRS; THROUGH MAINT CTL; LOCATED THE ACFT AND HAD THE CABLE TENSION CHKED AND RESET. FAILED TO USE THE CORRECT MANUAL WHEN CHKING FOR CABLE SIZE. THIS MISTAKE LED US TO THE WRONG CABLE TENSIONING DATA. I SUSPECT THAT THE RIGGING JOB TOOK PLACE ON THE FIRST DAY BACK FROM VACATION AND MY ATTN WAS NOT WHAT IT SHOULD HAVE BEEN.
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.