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A B737-300 was returned to service in non compliance after replacement of a cowl anti-ice valve corrected a deferred item. Failed to clear MEL special procedure.
| Attributes | |
| ACN | 607186 |
| Time | |
| Date | 200401 |
| Day | Wed |
| 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 | B737-300 |
| 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 | 607186 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel 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 other |
| Factors | |
| Maintenance | contributing factor : manuals contributing factor : schedule pressure performance deficiency : scheduled maintenance performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : inspection |
| Supplementary | |
| Problem Areas | Aircraft Chart Or Publication Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Aircraft arrived in ZZZ on jan/wed/04. I was assigned to the aircraft to perform routine overnight service and work on the item on MEL 30.3. After troubleshooting system, I determined the cowl anti-ice valve was defective and removed and replaced it per instructions. After changing the valve, I ground checked it by using APU bleed air and manually opening the prsov. Nose cowl anti-ice valve tested ok. Event caused by: special procedures performed when installing MEL 30.3 were not listed on MEL placard. Thus, I was not aware of special procedures. I did not refer to the MEL book when I cleared the item.
Original NASA ASRS Text
Title: A B737-300 WAS RETURNED TO SVC IN NON COMPLIANCE AFTER REPLACEMENT OF A COWL ANTI-ICE VALVE CORRECTED A DEFERRED ITEM. FAILED TO CLR MEL SPECIAL PROC.
Narrative: ACFT ARRIVED IN ZZZ ON JAN/WED/04. I WAS ASSIGNED TO THE ACFT TO PERFORM ROUTINE OVERNIGHT SVC AND WORK ON THE ITEM ON MEL 30.3. AFTER TROUBLESHOOTING SYS, I DETERMINED THE COWL ANTI-ICE VALVE WAS DEFECTIVE AND REMOVED AND REPLACED IT PER INSTRUCTIONS. AFTER CHANGING THE VALVE, I GND CHKED IT BY USING APU BLEED AIR AND MANUALLY OPENING THE PRSOV. NOSE COWL ANTI-ICE VALVE TESTED OK. EVENT CAUSED BY: SPECIAL PROCS PERFORMED WHEN INSTALLING MEL 30.3 WERE NOT LISTED ON MEL PLACARD. THUS, I WAS NOT AWARE OF SPECIAL PROCS. I DID NOT REFER TO THE MEL BOOK WHEN I CLRED THE ITEM.
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.