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After performing a dfcs (digital flight control system) and hgs (head-up guidance system) bite check for a flagged first officer's radio altimeter; a line lead mechanic signs-off a pilot write-up and released a B737-700 for service as CAT-3 capable. A paperwork audit later noted the lead did not have appropriate qualification to allow this aircraft to continue as CAT-3 capable.
| Attributes | |
| ACN | 909374 |
| Time | |
| Date | 201009 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Parked |
| Component | |
| Aircraft Component | Radio Altimeter |
| Person 1 | |
| Function | Lead Technician |
| Qualification | Maintenance Airframe Maintenance Powerplant |
| Events | |
| Anomaly | Aircraft Equipment Problem Critical Deviation - Procedural Published Material / Policy |
Narrative:
Pilot report states captain's radio altimeter was flagged in flight. On arrival crew reports that captain's is working correctly but first officer's radio altimeter had failed in flight. On ground everything was working normally. We performed dfcs (digital flight control system) bite check with no faults noted. Checked hgs (head-up guidance system) for possible faults with none noted. Aircraft was signed-off as; 'performed dfcs & hgs bite checks no faults noted; okay for service at CAT III capable.'by not being CAT III qualified; I'd forgotten that even a dfcs bite (check) requires recertification and the 'CAT III capable' statement was to assure the crew we'd done as much trouble shooting as possible with no faults noted.
Original NASA ASRS Text
Title: After performing a DFCS (Digital Flight Control System) and HGS (Head-up Guidance System) BITE check for a flagged First Officer's Radio Altimeter; a Line Lead Mechanic signs-off a pilot write-up and released a B737-700 for service as CAT-3 capable. A Paperwork Audit later noted the Lead did not have appropriate qualification to allow this aircraft to continue as CAT-3 capable.
Narrative: Pilot report states Captain's radio altimeter was flagged in flight. On arrival crew reports that Captain's is working correctly but First Officer's radio altimeter had failed in flight. On ground everything was working normally. We performed DFCS (Digital Flight Control System) Bite Check with no faults noted. Checked HGS (Head-up Guidance System) for possible faults with none noted. Aircraft was signed-off as; 'performed DFCS & HGS Bite Checks no faults noted; okay for service at CAT III capable.'By not being CAT III qualified; I'd forgotten that even a DFCS Bite (check) requires recertification and the 'CAT III capable' statement was to assure the crew we'd done as much trouble shooting as possible with no faults noted.
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.