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A B757-200 autoplt was not returned to autoland status after repair, due to misinterp of the MEL special procedures.
| Attributes | |
| ACN | 562856 |
| Time | |
| Date | 200209 |
| Day | Mon |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B757 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 562856 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : published procedure non adherence : far |
| Independent Detector | other other : person 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : manuals performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Lower minimum performance downgraded to land to level 2 for the left autoplt. Then, downgraded to 'approach only' for ILS. ILS was fixed and lower minimum performance mechanic performed 'operations ok' on ILS. Wanted to upgrade to land 2. I upgraded aircraft to land 2 by changing limit line on MEL and entering into line. Autoplt still inoperative. Lower minimum performance should remain at 'approach only' until autoland test.
Original NASA ASRS Text
Title: A B757-200 AUTOPLT WAS NOT RETURNED TO AUTOLAND STATUS AFTER REPAIR, DUE TO MISINTERP OF THE MEL SPECIAL PROCS.
Narrative: LOWER MINIMUM PERFORMANCE DOWNGRADED TO LAND TO LEVEL 2 FOR THE L AUTOPLT. THEN, DOWNGRADED TO 'APCH ONLY' FOR ILS. ILS WAS FIXED AND LOWER MINIMUM PERFORMANCE MECH PERFORMED 'OPS OK' ON ILS. WANTED TO UPGRADE TO LAND 2. I UPGRADED ACFT TO LAND 2 BY CHANGING LIMIT LINE ON MEL AND ENTERING INTO LINE. AUTOPLT STILL INOP. LOWER MINIMUM PERFORMANCE SHOULD REMAIN AT 'APCH ONLY' UNTIL AUTOLAND TEST.
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.