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During flight crew preflight; the 'IRU #2 fail' indication was noted and written-up. Maintenance deferred write-up MEL 34-16-01 after troubleshooting indicated air data function faults. MEL was later determined to be incorrect; since #2 IRU had completely failed and MEL 34-43-03 should have been applied.
| Attributes | |
| ACN | 914689 |
| Time | |
| Date | 201010 |
| Local Time Of Day | 1801-2400 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Aircraft 1 | |
| Make Model Name | DC-10 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | INS / IRS / IRU |
| Person 1 | |
| Function | Captain Pilot Flying |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural FAR Deviation - Procedural Maintenance Deviation - Procedural MEL |
Narrative:
On preflight by the flight crew the 'inertial reference unit (IRU) #2 fail' indication was noted and written up in the aircraft maintenance log. Maintenance assigned MEL 34-16-01-01 to the discrepancy which was associated with an air data function. During maintenance diagnostic testing; several other failures were noted. The air data function MEL therefore appeared to be a fair assessment. It was later discovered that the MEL assignment was in error. The #2 IRU should have been swapped with the auxiliary IRU per MM 34-43-03-04. It is possible this aircraft was flown in a 'no fly' condition.
Original NASA ASRS Text
Title: During flight crew preflight; the 'IRU #2 fail' indication was noted and written-up. Maintenance deferred write-up MEL 34-16-01 after troubleshooting indicated Air Data function faults. MEL was later determined to be incorrect; since #2 IRU had completely failed and MEL 34-43-03 should have been applied.
Narrative: On preflight by the flight crew the 'Inertial Reference Unit (IRU) #2 fail' indication was noted and written up in the Aircraft Maintenance Log. Maintenance assigned MEL 34-16-01-01 to the discrepancy which was associated with an Air Data function. During Maintenance diagnostic testing; several other failures were noted. The Air Data function MEL therefore appeared to be a fair assessment. It was later discovered that the MEL assignment was in error. The #2 IRU should have been swapped with the AUX IRU per MM 34-43-03-04. It is possible this aircraft was flown in a 'No Fly' condition.
Data retrieved from NASA's ASRS site as of April 2012 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.