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A B767-300 was dispatched in non compliance with the #2 radio altimeter deferred as inoperative with a previous deferral on the gpwas system in conflict with the MEL.
| Attributes | |
| ACN | 494597 |
| Time | |
| Date | 200011 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B767-300 and 300 ER |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : fcc |
| ASRS Report | 493140 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | oversight : supervisor |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 494597 |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance non adherence : published procedure non adherence : far |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : manuals performance deficiency : logbook entry performance deficiency : non compliance with legal requirements performance deficiency : fault isolation |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
On nov/mon/00, ZZZ maintenance called and requested MEL 34-23B for the r-hand radio altimeter inoperative reference PIREP 86. I called dispatch and received his concurrence and issued MEL 34-23-B authority/authorized ww-xx-yy. Both the dispatcher and myself missed the note at the bottom that gpwas must be operative for the r-hand radio altimeter to be inoperative. As the gpwas was placarded the day before on nov/sun/00, the note requiring gpwas was added to the MEL. I cannot find anywhere in wiring diagrams where gpwas and r-hand radio altimeter interface.
Original NASA ASRS Text
Title: A B767-300 WAS DISPATCHED IN NON COMPLIANCE WITH THE #2 RADIO ALTIMETER DEFERRED AS INOP WITH A PREVIOUS DEFERRAL ON THE GPWAS SYS IN CONFLICT WITH THE MEL.
Narrative: ON NOV/MON/00, ZZZ MAINT CALLED AND REQUESTED MEL 34-23B FOR THE R-HAND RADIO ALTIMETER INOP REF PIREP 86. I CALLED DISPATCH AND RECEIVED HIS CONCURRENCE AND ISSUED MEL 34-23-B AUTH WW-XX-YY. BOTH THE DISPATCHER AND MYSELF MISSED THE NOTE AT THE BOTTOM THAT GPWAS MUST BE OPERATIVE FOR THE R-HAND RADIO ALTIMETER TO BE INOP. AS THE GPWAS WAS PLACARDED THE DAY BEFORE ON NOV/SUN/00, THE NOTE REQUIRING GPWAS WAS ADDED TO THE MEL. I CANNOT FIND ANYWHERE IN WIRING DIAGRAMS WHERE GPWAS AND R-HAND RADIO ALTIMETER INTERFACE.
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.