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A B737-500 landing gear warning test aural and visual failed on crew preflight test. Found maintenance did not remove test units from uplock sensors after job completion.
| Attributes | |
| ACN | 651488 |
| Time | |
| Date | 200503 |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | agl single value : 0 |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737-500 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | ground : parked |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| ASRS Report | 651488 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | maintenance : technician |
| Events | |
| Anomaly | aircraft equipment problem : critical maintenance problem : improper maintenance maintenance problem : improper documentation non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : landing gear warning other flight crewa other flight crewb |
| Resolutory Action | none taken : detected after the fact |
| Consequence | other other |
| Factors | |
| Maintenance | contributing factor : work cards contributing factor : schedule pressure contributing factor : lighting performance deficiency : non compliance with legal requirements performance deficiency : testing performance deficiency : logbook entry performance deficiency : installation |
| Supplementary | |
| Problem Areas | Environmental Factor Maintenance Human Performance Aircraft Chart Or Publication |
| Primary Problem | Maintenance Human Performance |
Narrative:
After completing the operations check on the aircraft; #2 throttle switch pack right&right and rig. I removed all 3 brass 'break' devices from the nose and main downlock sensors. I omitted to remove the 2 main gear 'make' devices from the up lock sensors. The next morning; the crew couldn't perform the gear handle lights test. Maintenance was called out and found the 'make' devices installed. They removed the devices and the aircraft pushed and continued without incident.
Original NASA ASRS Text
Title: A B737-500 LNDG GEAR WARNING TEST AURAL AND VISUAL FAILED ON CREW PREFLT TEST. FOUND MAINT DID NOT REMOVE TEST UNITS FROM UPLOCK SENSORS AFTER JOB COMPLETION.
Narrative: AFTER COMPLETING THE OPS CHK ON THE ACFT; #2 THROTTLE SWITCH PACK R&R AND RIG. I REMOVED ALL 3 BRASS 'BREAK' DEVICES FROM THE NOSE AND MAIN DOWNLOCK SENSORS. I OMITTED TO REMOVE THE 2 MAIN GEAR 'MAKE' DEVICES FROM THE UP LOCK SENSORS. THE NEXT MORNING; THE CREW COULDN'T PERFORM THE GEAR HANDLE LIGHTS TEST. MAINT WAS CALLED OUT AND FOUND THE 'MAKE' DEVICES INSTALLED. THEY REMOVED THE DEVICES AND THE ACFT PUSHED AND CONTINUED WITHOUT INCIDENT.
Data retrieved from NASA's ASRS site as of January 2009 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.