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A B737-400 was dispatched with 2 autoplt deferred items that were in conflict as the special procedures checks would cancel out both items.
| Attributes | |
| ACN | 692846 |
| Time | |
| Date | 200604 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain |
| Experience | flight time last 90 days : 220 |
| ASRS Report | 692846 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : non compliance with mel non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : autoplt warnings other flight crewa |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : manuals performance deficiency : non compliance with legal requirements performance deficiency : logbook entry |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
Aircraft had 5 MEL's: 22-1A; 22-5D; 22-10; 34-12A; 34-44D. The 22's were in conflict as -5D and -10 required a recall check with mach trim; speed control and flight control lights on. If not; it says call maintenance for further troubleshooting. 22-1A tells maintenance to check that these lights don't illuminate. Maintenance control's initial response was that this is the way it is supposed to work. I inquired further and 2 hours later it was decided to fix the autoplt. MEL manual needs to be highlighted in some way where one MEL cancels another. Maintenance needs to have more than 1 person review multiple MEL's especially when they relate to similar system are involved.
Original NASA ASRS Text
Title: A B737-400 WAS DISPATCHED WITH 2 AUTOPLT DEFERRED ITEMS THAT WERE IN CONFLICT AS THE SPECIAL PROCS CHKS WOULD CANCEL OUT BOTH ITEMS.
Narrative: ACFT HAD 5 MEL'S: 22-1A; 22-5D; 22-10; 34-12A; 34-44D. THE 22'S WERE IN CONFLICT AS -5D AND -10 REQUIRED A RECALL CHK WITH MACH TRIM; SPD CTL AND FLT CTL LIGHTS ON. IF NOT; IT SAYS CALL MAINT FOR FURTHER TROUBLESHOOTING. 22-1A TELLS MAINT TO CHK THAT THESE LIGHTS DON'T ILLUMINATE. MAINT CTL'S INITIAL RESPONSE WAS THAT THIS IS THE WAY IT IS SUPPOSED TO WORK. I INQUIRED FURTHER AND 2 HRS LATER IT WAS DECIDED TO FIX THE AUTOPLT. MEL MANUAL NEEDS TO BE HIGHLIGHTED IN SOME WAY WHERE ONE MEL CANCELS ANOTHER. MAINT NEEDS TO HAVE MORE THAN 1 PERSON REVIEW MULTIPLE MEL'S ESPECIALLY WHEN THEY RELATE TO SIMILAR SYS ARE INVOLVED.
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.