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A B737-700 had a navigation display electronics unit replaced but not autoland tested. Airplane was dispatched in autoland status.
| Attributes | |
| ACN | 637938 |
| Time | |
| Date | 200411 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Environment | |
| Light | Night |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : maintenance |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| ASRS Report | 637938 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : lead technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | aircraft equipment other aircraft equipment : acft placard other other : 1 |
| Resolutory Action | none taken : detected after the fact |
| Factors | |
| Maintenance | performance deficiency : installation performance deficiency : testing performance deficiency : non compliance with legal requirements performance deficiency : logbook entry performance deficiency : unqualified personnel |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft |
| Primary Problem | Maintenance Human Performance |
Narrative:
Flight crew wrote up captain's display intermittent. Time approximately XA30. This aircraft was to depart at XE15 (approximately 4 hour delay). With so much ground time, I decided to replace display electronics unit computer #1. After checking maintenance components and parts compatibility and proper software installation, I replaced this computer per maintenance manual 31-62-21-4. Since I am not CAT III and had no way to re-certify to CAT III I waited for mechanics who start at XB30 to re-certify this aircraft for me. The aircraft got a bump up departure time and departed before it was re-certified to CAT III. Maintenance control was immediately notified and the aircraft was re-certified at next station. This aircraft departed without downgrading to CAT I minimums.
Original NASA ASRS Text
Title: A B737-700 HAD A NAV DISPLAY ELECTRONICS UNIT REPLACED BUT NOT AUTOLAND TESTED. AIRPLANE WAS DISPATCHED IN AUTOLAND STATUS.
Narrative: FLT CREW WROTE UP CAPT'S DISPLAY INTERMITTENT. TIME APPROX XA30. THIS ACFT WAS TO DEPART AT XE15 (APPROX 4 HR DELAY). WITH SO MUCH GND TIME, I DECIDED TO REPLACE DISPLAY ELECTRONICS UNIT COMPUTER #1. AFTER CHKING MAINT COMPONENTS AND PARTS COMPATIBILITY AND PROPER SOFTWARE INSTALLATION, I REPLACED THIS COMPUTER PER MAINT MANUAL 31-62-21-4. SINCE I AM NOT CAT III AND HAD NO WAY TO RE-CERTIFY TO CAT III I WAITED FOR MECHS WHO START AT XB30 TO RE-CERTIFY THIS ACFT FOR ME. THE ACFT GOT A BUMP UP DEP TIME AND DEPARTED BEFORE IT WAS RE-CERTIFIED TO CAT III. MAINT CTL WAS IMMEDIATELY NOTIFIED AND THE ACFT WAS RE-CERTIFIED AT NEXT STATION. THIS ACFT DEPARTED WITHOUT DOWNGRADING TO CAT I MINIMUMS.
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.