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A total of 6 B737 aircraft were dispatched in non compliance with the incorrect ground proximity computer installed.
| Attributes | |
| ACN | 489258 |
| Time | |
| Date | 200010 |
| 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 | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked ground : maintenance |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | other personnel other |
| ASRS Report | 489258 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Qualification | technician : powerplant technician : airframe |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : published procedure non adherence : far |
| Independent Detector | other other : person 1 |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : schedule pressure contributing factor : manuals contributing factor : engineering procedure performance deficiency : non compliance with legal requirements performance deficiency : scheduled maintenance performance deficiency : installation |
| Supplementary | |
| Problem Areas | Maintenance Human Performance Aircraft Chart Or Publication Company |
| Primary Problem | Maintenance Human Performance |
Narrative:
In the process of starting to upgrade all fleet's egpws (enhanced ground proximity warning system) computers to -XXX, I noted company part number abcx had 2 manufacturer's part numbers: -YYY or -ZZZ. Telex from boeing stated -YYY was never certified on B737. Further research showed B777 only certified with -YYY. B737 only certified with -ZZZ. After discussion with inventory on removing -YYY from the company part numbers, I was going to release manual alerts to the B777 and B737 fleets to prevent incorrect units being installed on the aircraft. I decided to verify the aircraft were correctly configured by issuing an alert on oct/mon/00, while reviewing the B737 alert, 6 aircraft were found incorrect.
Original NASA ASRS Text
Title: A TOTAL OF 6 B737 ACFT WERE DISPATCHED IN NON COMPLIANCE WITH THE INCORRECT GND PROX COMPUTER INSTALLED.
Narrative: IN THE PROCESS OF STARTING TO UPGRADE ALL FLEET'S EGPWS (ENHANCED GND PROX WARNING SYS) COMPUTERS TO -XXX, I NOTED COMPANY PART NUMBER ABCX HAD 2 MANUFACTURER'S PART NUMBERS: -YYY OR -ZZZ. TELEX FROM BOEING STATED -YYY WAS NEVER CERTIFIED ON B737. FURTHER RESEARCH SHOWED B777 ONLY CERTIFIED WITH -YYY. B737 ONLY CERTIFIED WITH -ZZZ. AFTER DISCUSSION WITH INVENTORY ON REMOVING -YYY FROM THE COMPANY PART NUMBERS, I WAS GOING TO RELEASE MANUAL ALERTS TO THE B777 AND B737 FLEETS TO PREVENT INCORRECT UNITS BEING INSTALLED ON THE ACFT. I DECIDED TO VERIFY THE ACFT WERE CORRECTLY CONFIGURED BY ISSUING AN ALERT ON OCT/MON/00, WHILE REVIEWING THE B737 ALERT, 6 ACFT WERE FOUND INCORRECT.
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.