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A maintenance controller is informed by a downline maintenance station that the required blending of lightning damage to the right wingtip diverter strip had not been accomplished prior to his MEL deferral.
| Attributes | |
| ACN | 779925 |
| Time | |
| Date | 200803 |
| 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 | B777-200 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| Qualification | technician : airframe technician : powerplant |
| Experience | maintenance lead technician : 20 |
| ASRS Report | 779925 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : briefing contributing factor : schedule pressure contributing factor : non availability of parts performance deficiency : non compliance with legal requirements performance deficiency : repair performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Maintenance requested a deferral for lightning damage to the right wingtip diverter strip per the structural repair manual. Was told damage was 2 inches by 0.16 inches deep. Told mechanic it needed to have an aspect ratio of 20 or better. Was not told that the blending was not performed. Upon arrival into ZZZ; maintenance found it to be out of limits; engineering then wrote an engineering authority/authorized to blend as required and correct the situation. Item corrected in ZZZ the same day. Structural repair manual was not interpreted correctly. It seemed to be a gray area as to the way the mechanic described the problem.
Original NASA ASRS Text
Title: A MAINT CTLR IS INFORMED BY A DOWNLINE MAINT STATION THAT THE REQUIRED BLENDING OF LIGHTNING DAMAGE TO THE RIGHT WINGTIP DIVERTER STRIP HAD NOT BEEN ACCOMPLISHED PRIOR TO HIS MEL DEFERRAL.
Narrative: MAINT REQUESTED A DEFERRAL FOR LIGHTNING DAMAGE TO THE R WINGTIP DIVERTER STRIP PER THE STRUCTURAL REPAIR MANUAL. WAS TOLD DAMAGE WAS 2 INCHES BY 0.16 INCHES DEEP. TOLD MECH IT NEEDED TO HAVE AN ASPECT RATIO OF 20 OR BETTER. WAS NOT TOLD THAT THE BLENDING WAS NOT PERFORMED. UPON ARR INTO ZZZ; MAINT FOUND IT TO BE OUT OF LIMITS; ENGINEERING THEN WROTE AN ENGINEERING AUTH TO BLEND AS REQUIRED AND CORRECT THE SITUATION. ITEM CORRECTED IN ZZZ THE SAME DAY. STRUCTURAL REPAIR MANUAL WAS NOT INTERPED CORRECTLY. IT SEEMED TO BE A GRAY AREA AS TO THE WAY THE MECH DESCRIBED THE PROB.
Data retrieved from NASA's ASRS site as of May 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.