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Second refusal of B747-400 for a deferred adp results in maintenance investigating and discovering the pump was not inoperative but only the automatic function thereof.
| Attributes | |
| ACN | 794741 |
| Time | |
| Date | 200807 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzzz.airport |
| State Reference | FO |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747-400 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : preflight |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Experience | flight time last 90 days : 150 flight time total : 1600 flight time type : 1250 |
| ASRS Report | 794741 |
| Events | |
| Anomaly | aircraft equipment problem : less severe maintenance problem : improper maintenance |
| Independent Detector | other flight crewa |
| Consequence | other |
| Factors | |
| Maintenance | contributing factor : schedule pressure performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : fault isolation |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Maintenance Human Performance Aircraft |
| Primary Problem | Aircraft |
Narrative:
My crew and I refused this aircraft 2 days earlier due to #1 adp inoperative. Aircraft was routed sfo-ZZZZ1 instead. Upon our arrival in ZZZ2 operations to flight plan abc ZZZ2-sfo was our aircraft with the #1 adp still deferred inoperative by maintenance. Again; we refused the aircraft. As maintenance was now forced to address the issue; it was determined that #1 adp was improperly deferred and that it was in fact functional in all but the 'automatic' mode and could be dispatched using the 'on' position for takeoff; departure; approach; and landing. We agreed to accept the aircraft and departed approximately 2 hours late.
Original NASA ASRS Text
Title: SECOND REFUSAL OF B747-400 FOR A DEFERRED ADP RESULTS IN MAINT INVESTIGATING AND DISCOVERING THE PUMP WAS NOT INOP BUT ONLY THE AUTO FUNCTION THEREOF.
Narrative: MY CREW AND I REFUSED THIS ACFT 2 DAYS EARLIER DUE TO #1 ADP INOP. ACFT WAS ROUTED SFO-ZZZZ1 INSTEAD. UPON OUR ARR IN ZZZ2 OPS TO FLT PLAN ABC ZZZ2-SFO WAS OUR ACFT WITH THE #1 ADP STILL DEFERRED INOP BY MAINT. AGAIN; WE REFUSED THE ACFT. AS MAINT WAS NOW FORCED TO ADDRESS THE ISSUE; IT WAS DETERMINED THAT #1 ADP WAS IMPROPERLY DEFERRED AND THAT IT WAS IN FACT FUNCTIONAL IN ALL BUT THE 'AUTO' MODE AND COULD BE DISPATCHED USING THE 'ON' POS FOR TKOF; DEP; APCH; AND LNDG. WE AGREED TO ACCEPT THE ACFT AND DEPARTED APPROX 2 HRS LATE.
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.